一个正在学习的javaer

SpringBoot+Mybatis Plus开发博客系统

一.下载layui社区的模版

https://fly.layui.com/store/FlyTemplate/

二.springboot热部署

参考（https://blog.csdn.net/panruola/article/details/87890234）
2.1导入依赖

>
    >org.springframework.boot>
    >spring-boot-devtools>
    >true>
>

2.2Compiler，勾选 “Make project automatically”

3.3.快捷键 Shift+Ctrl+Alt+/ ，选择 “Registry” ，选中打勾 “compiler.automake.allow.when.app.running”

三.导入到springboot项目中(抽取片段)

我们可以抽取功能的片段：比如comment.html中公共的css样式（title不一样，我们可以通过参数传过来）

<!DOCTYPE html>
:th="http://www.thymeleaf.org">
:fragment="commentStyle">
    -8">
    :</span>text="$<span class="token punctuation">{</span>title<span class="token punctuation">}</span>"<span class="token punctuation">></span>基于 layui 的极简社区页面模版</title<span class="token punctuation">></span>
    <meta name="viewport" content="width=device<span class="token punctuation">-</span>width<span class="token punctuation">,</span> initial<span class="token punctuation">-</span>scale=1<span class="token punctuation">,</span> maximum<span class="token punctuation">-</span>scale=1"<span class="token punctuation">></span>
    <meta name="keywords" content="fly<span class="token punctuation">,</span>layui<span class="token punctuation">,</span>前端社区"<span class="token punctuation">></span>
    <meta name="description" content="Fly社区是模块化前端UI框架Layui的官网社区，致力于为web开发提供强劲动力"<span class="token punctuation">></span>
    <link rel="stylesheet" th<span class="token punctuation">:</span>href="@<span class="token punctuation">{</span>/static/layui/css/layui.css<span class="token punctuation">}</span>"<span class="token punctuation">></span>
    <link rel="stylesheet" th<span class="token punctuation">:</span>href="@<span class="token punctuation">{</span>/static/css/global.css<span class="token punctuation">}</span>"<span class="token punctuation">></span>
</head<span class="token punctuation">></span>
<body<span class="token punctuation">></span>
</code></pre> 
  <p><strong>引入：</strong></p> 
  <pre><code class="prism language-yaml"><<span class="token tag">!--引入公共头部样式--></span>
<head th<span class="token punctuation">:</span>replace="~<span class="token punctuation">{</span>inc/comment<span class="token punctuation">:</span><span class="token punctuation">:</span>commentStyle(title='首页')<span class="token punctuation">}</span>"<span class="token punctuation">></span>
</code></pre> 
  <h2>四.controller中防止非整形访问该URL会报异常，所以通过id:\\d*来只允许整形通过</h2> 
  <pre><code class="prism language-yaml">    /*
    博客详细页面
    id<span class="token punctuation">:</span>\d*只允许传的参数为整形
     */
    @GetMapping("/post/<span class="token punctuation">{</span>id<span class="token punctuation">:</span>\\d*<span class="token punctuation">}</span>")
    public String detail(@PathVariable("id") Long id)<span class="token punctuation">{</span>
        return "post/detail";
    <span class="token punctuation">}</span>
</code></pre> 
  <h2>五.导航栏的信息通过项目启动就存进容器中，这样项目一运行就查询数据库中的数据</h2> 
  <p>1.创建一个类实现ApplicationRunner和ServletContextAware类</p> 
  <ol> 
   <li>ApplicationRunner用于在项目运行就执行</li> 
   <li>ServletContextAware用于获取容器上下文</li> 
  </ol> 
  <p>2.运行项目查询数据库中数据，并存进上下文</p> 
  <pre><code class="prism language-java"><span class="token keyword">package</span> com<span class="token punctuation">.</span>wcy<span class="token punctuation">.</span>eblog<span class="token punctuation">.</span>config<span class="token punctuation">;</span>

<span class="token keyword">import</span> com<span class="token punctuation">.</span>baomidou<span class="token punctuation">.</span>mybatisplus<span class="token punctuation">.</span>core<span class="token punctuation">.</span>conditions<span class="token punctuation">.</span>query<span class="token punctuation">.</span>QueryWrapper<span class="token punctuation">;</span>
<span class="token keyword">import</span> com<span class="token punctuation">.</span>wcy<span class="token punctuation">.</span>eblog<span class="token punctuation">.</span>entity<span class="token punctuation">.</span>MCategory<span class="token punctuation">;</span>
<span class="token keyword">import</span> com<span class="token punctuation">.</span>wcy<span class="token punctuation">.</span>eblog<span class="token punctuation">.</span>service<span class="token punctuation">.</span>MCategoryService<span class="token punctuation">;</span>
<span class="token keyword">import</span> org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>beans<span class="token punctuation">.</span>factory<span class="token punctuation">.</span>annotation<span class="token punctuation">.</span>Autowired<span class="token punctuation">;</span>
<span class="token keyword">import</span> org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>boot<span class="token punctuation">.</span>ApplicationArguments<span class="token punctuation">;</span>
<span class="token keyword">import</span> org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>boot<span class="token punctuation">.</span>ApplicationRunner<span class="token punctuation">;</span>
<span class="token keyword">import</span> org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>context<span class="token punctuation">.</span>annotation<span class="token punctuation">.</span>Bean<span class="token punctuation">;</span>
<span class="token keyword">import</span> org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>stereotype<span class="token punctuation">.</span>Component<span class="token punctuation">;</span>
<span class="token keyword">import</span> org<span class="token punctuation">.</span>springframework<span class="token punctuation">.</span>web<span class="token punctuation">.</span>context<span class="token punctuation">.</span>ServletContextAware<span class="token punctuation">;</span>

<span class="token keyword">import</span> javax<span class="token punctuation">.</span>servlet<span class="token punctuation">.</span>ServletContext<span class="token punctuation">;</span>
<span class="token keyword">import</span> java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>List<span class="token punctuation">;</span>

<span class="token comment">/**
 * ApplicationRunner 容器在启动的时候就会执行
 * ServletContextAware获取上下文容器
 * 把分类（导航栏）存进上下文容器中 (便于速度更快)
 */</span>
<span class="token annotation punctuation">@Component</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ContextStartUp</span> <span class="token keyword">implements</span> <span class="token class-name">ApplicationRunner</span><span class="token punctuation">,</span> ServletContextAware <span class="token punctuation">{</span>
    <span class="token annotation punctuation">@Autowired</span>
    <span class="token keyword">private</span> MCategoryService mCategoryService<span class="token punctuation">;</span>

    ServletContext servletContext<span class="token punctuation">;</span>
    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">run</span><span class="token punctuation">(</span>ApplicationArguments args<span class="token punctuation">)</span> <span class="token keyword">throws</span> Exception <span class="token punctuation">{</span>
        <span class="token comment">//查询status=0的所有分类导航栏 若为1则不查询</span>
        List<span class="token generics function"><span class="token punctuation"><</span>MCategory<span class="token punctuation">></span></span> mCategoryList <span class="token operator">=</span> mCategoryService<span class="token punctuation">.</span><span class="token function">list</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">QueryWrapper</span><span class="token generics function"><span class="token punctuation"><</span>MCategory<span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">eq</span><span class="token punctuation">(</span><span class="token string">"status"</span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//把查询到的数据存进容器中</span>
        servletContext<span class="token punctuation">.</span><span class="token function">setAttribute</span><span class="token punctuation">(</span><span class="token string">"mCategoryList"</span><span class="token punctuation">,</span> mCategoryList<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setServletContext</span><span class="token punctuation">(</span>ServletContext servletContext<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>servletContext<span class="token operator">=</span>servletContext<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>

</code></pre> 
  <p>3.thymeleaf获取容器上下文的方法</p> 
  <pre><code class="prism language-yaml">            <li th<span class="token punctuation">:</span>each="category<span class="token punctuation">:</span>$<span class="token punctuation">{</span><span class="token comment">#servletContext.getAttribute('mCategoryList')}"></span>
                <a th<span class="token punctuation">:</span>href="@<span class="token punctuation">{</span>'/catalog/'+$<span class="token punctuation">{</span>category.id<span class="token punctuation">}</span><span class="token punctuation">}</span>"<span class="token punctuation">></span><span class="token punctuation">[</span><span class="token punctuation">[</span>$<span class="token punctuation">{</span>category.name<span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token punctuation">]</span></a<span class="token punctuation">></span>
            </li<span class="token punctuation">></span>
</code></pre> 
  <h2>六.thymeleaf处理时间显示成几小时前</h2> 
  <pre><code class="prism language-yaml">              <<span class="token tag">!--对时间处理成几小时前--></span><span class="token scalar string">
              <span th:datetime="${#dates.format(postVo.created, 'yyyy-MM-dd HH:mm')}" class="time"></span>
              <script src="https://cdn.bootcss.com/timeago.js/3.0.2/timeago.js"></script>
              <script></span>

                  // 自动更新
                  var timeagoInstance = timeago();// 实例
                  timeagoInstance.render(document.querySelectorAll('.time')<span class="token punctuation">,</span>'zh_CN');
              </script<span class="token punctuation">></span>
</code></pre> 
  <h2>七.注意layui分页的JS需要等页面加载完毕才执行</h2> 
  <p>问题：防止layui分页消失，不会出现分页按钮<br> 解决：</p> 
  <pre><code class="prism language-yaml">放到JQ的加载完毕才会执行的方法

$(function()<span class="token punctuation">{</span>
           
           
 <span class="token punctuation">}</span>);
</code></pre> 
  <h2>八.实现博客七天回复量排行榜（redis实现）</h2> 
  <p>1.实现逻辑：</p> 
  <ol> 
   <li>查询数据库中前七天的博客以及博客的评论数</li> 
   <li>通过redis的zset有序集合key存关于天数的（博客创建的那一天 有序map），然后zset里面的key存博客id之类的，分数存评论数<br> 比如：2020-7-2日有哪些博客创建了并且评论了，那么就会存进这个有序集合的key里面（见下图）</li> 
  </ol> 
  <p><a href="http://img.e-com-net.com/image/info8/b7f3c7d3f2e740d1986cc908cbfde0e8.png" target="_blank"><img src="http://img.e-com-net.com/image/info8/b7f3c7d3f2e740d1986cc908cbfde0e8.png" alt="SpringBoot+Mybatis Plus开发博客系统_第3张图片" width="510" height="109" style="border:1px solid black;"></a><br> 4. 因为web端需要展示博客的标题、评论数，所有还需要通过一个hash来存储这些数据。<br> 5. 这些都需要设置一个过期时间 超出七天则清除</p> 
  <p><strong>2.对应的service逻辑方法：</strong></p> 
  <pre><code class="prism language-java">    <span class="token comment">//初始化本周热议</span>
    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">initWeekRank</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token comment">//1.查询七天内的博客</span>
        <span class="token comment">//DateUtil.offset(new Date(), DateField.DAY_OF_MONTH,-7)获取当前时间的第前七天的时间</span>
        List<span class="token generics function"><span class="token punctuation"><</span>MPost<span class="token punctuation">></span></span> mPosts <span class="token operator">=</span> mPostMapper<span class="token punctuation">.</span><span class="token function">selectList</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">QueryWrapper</span><span class="token generics function"><span class="token punctuation"><</span>MPost<span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span>
                <span class="token punctuation">.</span><span class="token function">ge</span><span class="token punctuation">(</span><span class="token string">"created"</span><span class="token punctuation">,</span> DateUtil<span class="token punctuation">.</span><span class="token function">offset</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> DateField<span class="token punctuation">.</span>DAY_OF_MONTH<span class="token punctuation">,</span><span class="token operator">-</span><span class="token number">7</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
                <span class="token punctuation">.</span><span class="token function">gt</span><span class="token punctuation">(</span><span class="token string">"comment_count"</span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token comment">//评论数大于0</span>
        <span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//2.存进redis中</span>
        <span class="token keyword">for</span><span class="token punctuation">(</span>MPost mPost<span class="token operator">:</span>mPosts<span class="token punctuation">)</span><span class="token punctuation">{</span>
            String key<span class="token operator">=</span><span class="token string">"eblog:rank:time:"</span><span class="token operator">+</span>DateUtil<span class="token punctuation">.</span><span class="token function">format</span><span class="token punctuation">(</span>mPost<span class="token punctuation">.</span><span class="token function">getCreated</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token string">"yyyy-MM-dd"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token comment">//2.1//存进zset中</span>
            redisUtil<span class="token punctuation">.</span><span class="token function">zSet</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span>mPost<span class="token punctuation">.</span><span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>mPost<span class="token punctuation">.</span><span class="token function">getCommentCount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token comment">//2.2.计算当前时间与博客创建时间差  7-（18-14）</span>
            <span class="token keyword">long</span> time<span class="token operator">=</span><span class="token punctuation">(</span><span class="token number">7</span><span class="token operator">-</span>DateUtil<span class="token punctuation">.</span><span class="token function">between</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>mPost<span class="token punctuation">.</span><span class="token function">getCreated</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> DateUnit<span class="token punctuation">.</span>DAY<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token operator">*</span><span class="token number">24</span><span class="token operator">*</span><span class="token number">60</span><span class="token operator">*</span><span class="token number">60</span><span class="token punctuation">;</span>
            <span class="token comment">//2.3设置key消失时间</span>
            <span class="token keyword">boolean</span> expire <span class="token operator">=</span> redisUtil<span class="token punctuation">.</span><span class="token function">expire</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> time<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token comment">//2.4由于前端需要显示标题、评论数等信息</span>
            <span class="token function">hashCachePostIdAndTitle</span><span class="token punctuation">(</span>mPost<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token comment">//3.计算某七天的评论数并逆序排序</span>
        <span class="token function">zUnionPost7DaysForWeekRand</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token comment">//计算七天内的评论数</span>
    <span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">zUnionPost7DaysForWeekRand</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        String newKey<span class="token operator">=</span><span class="token string">"eblog:rank:7week"</span><span class="token punctuation">;</span>
        List<span class="token generics function"><span class="token punctuation"><</span>String<span class="token punctuation">></span></span> list<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token operator"><</span><span class="token operator">></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i<span class="token operator">=</span><span class="token operator">-</span><span class="token number">7</span><span class="token punctuation">;</span>i<span class="token operator"><</span><span class="token number">0</span><span class="token punctuation">;</span>i<span class="token operator">++</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token comment">//这七天的key存进list里面 用户求并集</span>
            String timeKey<span class="token operator">=</span><span class="token string">"eblog:rank:time:"</span><span class="token operator">+</span> DateUtil<span class="token punctuation">.</span><span class="token function">format</span><span class="token punctuation">(</span>DateUtil<span class="token punctuation">.</span><span class="token function">offsetDay</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>i<span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token string">"yyyy-MM-dd"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>timeKey<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        String key<span class="token operator">=</span><span class="token string">"eblog:rank:time:"</span><span class="token operator">+</span> DateUtil<span class="token punctuation">.</span><span class="token function">format</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token string">"yyyy-MM-dd"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        redisUtil<span class="token punctuation">.</span><span class="token function">zUnionAndStore</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span>list<span class="token punctuation">,</span>newKey<span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//timeKey</span>
    <span class="token punctuation">}</span>

    <span class="token comment">//把博客信息存进redis中</span>
    <span class="token keyword">private</span> <span class="token keyword">void</span> <span class="token function">hashCachePostIdAndTitle</span><span class="token punctuation">(</span>MPost mPost<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token comment">//通过博客的ID来存储键</span>
        String key<span class="token operator">=</span><span class="token string">"eblog:rank:post:"</span><span class="token operator">+</span>mPost<span class="token punctuation">.</span><span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//计算当前时间与博客创建时间差  7-（18-14）</span>
        <span class="token keyword">long</span> time<span class="token operator">=</span><span class="token punctuation">(</span><span class="token number">7</span><span class="token operator">-</span>DateUtil<span class="token punctuation">.</span><span class="token function">between</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>mPost<span class="token punctuation">.</span><span class="token function">getCreated</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> DateUnit<span class="token punctuation">.</span>DAY<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token operator">*</span><span class="token number">24</span><span class="token operator">*</span><span class="token number">60</span><span class="token operator">*</span><span class="token number">60</span><span class="token punctuation">;</span>
        <span class="token comment">//存进redis中并设置过期时间</span>
        redisUtil<span class="token punctuation">.</span><span class="token function">hset</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span><span class="token string">"id"</span><span class="token punctuation">,</span>mPost<span class="token punctuation">.</span><span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>time<span class="token punctuation">)</span><span class="token punctuation">;</span>
        redisUtil<span class="token punctuation">.</span><span class="token function">hset</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span><span class="token string">"title"</span><span class="token punctuation">,</span>mPost<span class="token punctuation">.</span><span class="token function">getTitle</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>time<span class="token punctuation">)</span><span class="token punctuation">;</span>
        redisUtil<span class="token punctuation">.</span><span class="token function">hset</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span><span class="token string">"commentCount"</span><span class="token punctuation">,</span>mPost<span class="token punctuation">.</span><span class="token function">getCommentCount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>time<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
</code></pre> 
  <p><strong>3.一旦用户评论或删除评论就修改缓存中评论的数目，并且重新更新缓存中的并集以及博客信息</strong></p> 
  <pre><code class="prism language-java">    <span class="token comment">/**
     * 增加或减少redis这篇博客的评论数
     * @param postId
     * @param isincr
     */</span>
    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">incrCommentWeekRank</span><span class="token punctuation">(</span>Long postId<span class="token punctuation">,</span> Boolean isincr<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        String key<span class="token operator">=</span><span class="token string">"eblog:rank:time:"</span><span class="token operator">+</span>DateUtil<span class="token punctuation">.</span><span class="token function">format</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token string">"yyyy-MM-dd"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        redisUtil<span class="token punctuation">.</span><span class="token function">zIncrementScore</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span>postId<span class="token punctuation">,</span>isincr<span class="token operator">?</span><span class="token number">1</span><span class="token operator">:</span><span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//判断是+1还是-1</span>
        <span class="token function">zUnionPost7DaysForWeekRand</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//重新更新七天的并集排行榜</span>
        MPost mPost <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">getById</span><span class="token punctuation">(</span>postId<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">hashCachePostIdAndTitle</span><span class="token punctuation">(</span>mPost<span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//重新更新这篇博客信息</span>
    <span class="token punctuation">}</span>
</code></pre> 
  <h2>九.博客访问量</h2> 
  <p>1.比如查看某篇博客就更新缓存的访问量</p> 
  <pre><code class="prism language-java">    <span class="token annotation punctuation">@GetMapping</span><span class="token punctuation">(</span><span class="token string">"/post/{id:\\d*}"</span><span class="token punctuation">)</span>
    <span class="token keyword">public</span> String <span class="token function">detail</span><span class="token punctuation">(</span><span class="token annotation punctuation">@PathVariable</span><span class="token punctuation">(</span><span class="token string">"id"</span><span class="token punctuation">)</span> Long id<span class="token punctuation">,</span>
    <span class="token annotation punctuation">@RequestParam</span><span class="token punctuation">(</span>name <span class="token operator">=</span> <span class="token string">"current"</span><span class="token punctuation">,</span>required <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">,</span>defaultValue <span class="token operator">=</span> <span class="token string">"1"</span><span class="token punctuation">)</span> Long current
            <span class="token punctuation">,</span><span class="token annotation punctuation">@RequestParam</span><span class="token punctuation">(</span>name <span class="token operator">=</span> <span class="token string">"size"</span><span class="token punctuation">,</span>required <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">,</span>defaultValue <span class="token operator">=</span> <span class="token string">"2"</span><span class="token punctuation">)</span> Long size<span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token comment">//返回博客信息</span>
        PostVo postVo<span class="token operator">=</span>mPostService<span class="token punctuation">.</span><span class="token function">findPostById</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token comment">//实时更新缓存中访问量</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>mPostService<span class="token punctuation">.</span><span class="token function">putViewCount</span><span class="token punctuation">(</span>postVo<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//返回评论信息 1.分页 2.博客id 3.用户id 4.排序</span>
        IPage<span class="token generics function"><span class="token punctuation"><</span>CommentVo<span class="token punctuation">></span></span> commentVoIPage<span class="token operator">=</span>mCommentService<span class="token punctuation">.</span><span class="token function">pageingComment</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Page</span><span class="token punctuation">(</span>current<span class="token punctuation">,</span>size<span class="token punctuation">)</span><span class="token punctuation">,</span>id<span class="token punctuation">,</span>null<span class="token punctuation">,</span><span class="token string">"created"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        req<span class="token punctuation">.</span><span class="token function">setAttribute</span><span class="token punctuation">(</span><span class="token string">"PostVo"</span><span class="token punctuation">,</span>postVo<span class="token punctuation">)</span><span class="token punctuation">;</span>
        req<span class="token punctuation">.</span><span class="token function">setAttribute</span><span class="token punctuation">(</span><span class="token string">"CommentVo"</span><span class="token punctuation">,</span>commentVoIPage<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> <span class="token string">"post/detail"</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
</code></pre> 
  <p><strong>2.更新缓存访问量，给实体的访问量重新赋值，这样传回前端访问量就自动修改了</strong><br> 通过标题八缓存的博客信息来获取访问量，无则使用实体的</p> 
  <pre><code class="prism language-java">    <span class="token comment">/**
     *更新缓存中访问量
     * @param postVo
     */</span>
    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">putViewCount</span><span class="token punctuation">(</span>PostVo postVo<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token comment">//1.从缓存中拿出访问量 如果缓存中没有直接获取实体的访问量</span>
        String key<span class="token operator">=</span><span class="token string">"eblog:rank:post:"</span><span class="token operator">+</span>postVo<span class="token punctuation">.</span><span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        Integer viewCount <span class="token operator">=</span> <span class="token punctuation">(</span>Integer<span class="token punctuation">)</span>redisUtil<span class="token punctuation">.</span><span class="token function">hget</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> <span class="token string">"viewCount"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>viewCount<span class="token operator">!=</span>null<span class="token punctuation">)</span><span class="token punctuation">{</span>
            postVo<span class="token punctuation">.</span><span class="token function">setViewCount</span><span class="token punctuation">(</span>viewCount<span class="token operator">+</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span>
            postVo<span class="token punctuation">.</span><span class="token function">setViewCount</span><span class="token punctuation">(</span>postVo<span class="token punctuation">.</span><span class="token function">getViewCount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">+</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token comment">//2.更新缓存数据</span>
        redisUtil<span class="token punctuation">.</span><span class="token function">hset</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span><span class="token string">"viewCount"</span><span class="token punctuation">,</span>postVo<span class="token punctuation">.</span><span class="token function">getViewCount</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
</code></pre> 
  <h2>十.redis不能存储Long类型</h2> 
  <p>redis不能存储Long类型，会把Long类型转换为Integer类型，所以如果想要获取到long类型，就需要：</p> 
  <pre><code class="prism language-java">   Integer id <span class="token operator">=</span> <span class="token punctuation">(</span>Integer<span class="token punctuation">)</span>redisUtil<span class="token punctuation">.</span><span class="token function">hget</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> <span class="token string">"id"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//博客ID</span>
   Long idLong <span class="token operator">=</span> Long<span class="token punctuation">.</span><span class="token function">valueOf</span><span class="token punctuation">(</span>id<span class="token punctuation">.</span><span class="token function">longValue</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> 
  <h2>十一.springboot使用定时任务：</h2> 
  <p>1.开启定时任务</p> 
  <pre><code class="prism language-java"><span class="token comment">//开启定时任务</span>
<span class="token annotation punctuation">@EnableScheduling</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">EblogApplication</span> <span class="token punctuation">{</span>

    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span>String<span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        SpringApplication<span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span>EblogApplication<span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">,</span> args<span class="token punctuation">)</span><span class="token punctuation">;</span>
        System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"http://localhost:8088"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

<span class="token punctuation">}</span>
</code></pre> 
  <p><strong>2.使用 @Scheduled(fixedRate = 60<em>60</em>1000)注解 （每一小时执行一次）</strong><br> <strong>参数配置：</strong><br> fixedRate = 10<em>1000 固定每10秒执行一次<br> fixedDelay = 10</em>1000 延迟每10秒执行一次<br> cron = “0 0 2 * * ?” //每天凌晨两点执行 https://qqe2.com/cron可配置cron<br> <strong>3.cron的更多配置。</strong><br> 每隔5秒执行一次：*/5 * * * * ?<br> 每隔1分钟执行一次：0 */1 * * * ?</p> 
  <p>每天23点执行一次：0 0 23 * * ?</p> 
  <p>每天凌晨1点执行一次：0 0 1 * * ?</p> 
  <p>每月1号凌晨1点执行一次：0 0 1 1 * ?</p> 
  <p>每月最后一天23点执行一次：0 0 23 L * ?</p> 
  <p>每周星期天凌晨1点实行一次：0 0 1 ? * L</p> 
  <p>在26分、29分、33分执行一次：0 26,29,33 * * * ?</p> 
  <p>每天的0点、13点、18点、21点都执行一次：0 0 0,13,18,21 * * ?</p> 
  <h2>十二.springboot实现定时更新访问量</h2> 
  <pre><code class="prism language-java"><span class="token comment">/**
 * 定时更新访问量
 */</span>
<span class="token annotation punctuation">@Component</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ViewCountSyncTask</span> <span class="token punctuation">{</span>
    <span class="token annotation punctuation">@Autowired</span>
    <span class="token keyword">private</span> RedisUtil redisUtil<span class="token punctuation">;</span>
    <span class="token annotation punctuation">@Autowired</span>
    <span class="token keyword">private</span> RedisTemplate<span class="token generics function"><span class="token punctuation"><</span>String<span class="token punctuation">,</span>Object<span class="token punctuation">></span></span> redisTemplate<span class="token punctuation">;</span>
    <span class="token annotation punctuation">@Autowired</span>
    <span class="token keyword">private</span> MPostService mPostService<span class="token punctuation">;</span>
    <span class="token comment">/**
     * @Scheduled进行定时任务
     * fixedRate = 10*1000 固定每10秒执行一次
     * fixedDelay = 10*1000 延迟每10秒执行一次
     * cron = "0 0 2 * * ?" //每天凌晨两点执行     https://qqe2.com/cron可配置cron
     *
     */</span>
    <span class="token annotation punctuation">@Scheduled</span><span class="token punctuation">(</span>fixedRate <span class="token operator">=</span> <span class="token number">60</span><span class="token operator">*</span><span class="token number">60</span><span class="token operator">*</span><span class="token number">1000</span><span class="token punctuation">)</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">viewCountTast</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token comment">//1.获取缓存中访问量</span>
        Set<span class="token generics function"><span class="token punctuation"><</span>String<span class="token punctuation">></span></span> keys <span class="token operator">=</span> redisTemplate<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">(</span><span class="token string">"eblog:rank:post:*"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//查询有eblog:rank:post:所有key</span>
        List<span class="token generics function"><span class="token punctuation"><</span>MPost<span class="token punctuation">></span></span> posts<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token operator"><</span><span class="token operator">></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">for</span><span class="token punctuation">(</span>String key<span class="token operator">:</span>keys<span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token comment">//查看缓存中是否有访问量</span>
            <span class="token keyword">if</span><span class="token punctuation">(</span>redisUtil<span class="token punctuation">.</span><span class="token function">hHasKey</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span><span class="token string">"viewCount"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                Integer id <span class="token operator">=</span> <span class="token punctuation">(</span>Integer<span class="token punctuation">)</span>redisUtil<span class="token punctuation">.</span><span class="token function">hget</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> <span class="token string">"id"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//博客ID</span>
                Long idLong <span class="token operator">=</span> Long<span class="token punctuation">.</span><span class="token function">valueOf</span><span class="token punctuation">(</span>id<span class="token punctuation">.</span><span class="token function">longValue</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                Integer viewCount <span class="token operator">=</span> <span class="token punctuation">(</span>Integer<span class="token punctuation">)</span>redisUtil<span class="token punctuation">.</span><span class="token function">hget</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> <span class="token string">"viewCount"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//博客访问量</span>
                MPost post<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">MPost</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                post<span class="token punctuation">.</span><span class="token function">setId</span><span class="token punctuation">(</span>idLong<span class="token punctuation">)</span><span class="token punctuation">;</span>
                post<span class="token punctuation">.</span><span class="token function">setViewCount</span><span class="token punctuation">(</span>viewCount<span class="token punctuation">)</span><span class="token punctuation">;</span>
                posts<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>post<span class="token punctuation">)</span><span class="token punctuation">;</span>

                <span class="token comment">//更新之后这些访问量缓存里面的数据需要清空（清空的原因：</span>
                <span class="token comment">// 如果不删除 下次执行这个方法就又会查出很多viewCount这个缓存 以至于上方的list会很大</span>
                redisUtil<span class="token punctuation">.</span><span class="token function">hdel</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span><span class="token string">"viewCount"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span>

        <span class="token comment">//2.判断是否需要更新到数据库</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>posts<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token keyword">return</span><span class="token punctuation">;</span>

        <span class="token comment">//3.批量更新数据库</span>
        <span class="token keyword">boolean</span> isUpdate <span class="token operator">=</span> mPostService<span class="token punctuation">.</span><span class="token function">updateBatchById</span><span class="token punctuation">(</span>posts<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>isUpdate<span class="token punctuation">)</span><span class="token punctuation">{</span>
            System<span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"------------------访问量更新数据库成功--------------------"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> 
  <h2>十三.springboot使用Hibernate Validator校验pojo的某些字段</h2> 
  <p><strong>1.spring-boot-starter-web包里面有hibernate-validator包，不需要引用hibernate validator依赖。</strong><br> 2.比如邮箱验证（不能为空和格式）</p> 
  <pre><code class="prism language-java"><span class="token keyword">import</span> javax<span class="token punctuation">.</span>validation<span class="token punctuation">.</span>constraints<span class="token punctuation">.</span>Email<span class="token punctuation">;</span>
<span class="token keyword">import</span> javax<span class="token punctuation">.</span>validation<span class="token punctuation">.</span>constraints<span class="token punctuation">.</span>NotBlank<span class="token punctuation">;</span>
    <span class="token annotation punctuation">@Email</span>
    <span class="token annotation punctuation">@NotBlank</span><span class="token punctuation">(</span>message <span class="token operator">=</span> <span class="token string">"邮箱不能为空"</span><span class="token punctuation">)</span>
    <span class="token keyword">private</span> String email<span class="token punctuation">;</span>
</code></pre> 
  <p>3.添加hibernate validator的工具类</p> 
  <pre><code class="prism language-java"><span class="token keyword">package</span> com<span class="token punctuation">.</span>wcy<span class="token punctuation">.</span>eblog<span class="token punctuation">.</span>util<span class="token punctuation">;</span>

<span class="token keyword">import</span> lombok<span class="token punctuation">.</span>Data<span class="token punctuation">;</span>
<span class="token keyword">import</span> org<span class="token punctuation">.</span>hibernate<span class="token punctuation">.</span>validator<span class="token punctuation">.</span>HibernateValidator<span class="token punctuation">;</span>

<span class="token keyword">import</span> javax<span class="token punctuation">.</span>validation<span class="token punctuation">.</span>ConstraintViolation<span class="token punctuation">;</span>
<span class="token keyword">import</span> javax<span class="token punctuation">.</span>validation<span class="token punctuation">.</span>Validation<span class="token punctuation">;</span>
<span class="token keyword">import</span> javax<span class="token punctuation">.</span>validation<span class="token punctuation">.</span>Validator<span class="token punctuation">;</span>
<span class="token keyword">import</span> java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>ArrayList<span class="token punctuation">;</span>
<span class="token keyword">import</span> java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>List<span class="token punctuation">;</span>
<span class="token keyword">import</span> java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>Set<span class="token punctuation">;</span>

<span class="token comment">/**
 * Hibernate Validator校验工具类
 */</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ValidationUtil</span> <span class="token punctuation">{</span>

    <span class="token comment">/**
     * 开启快速结束模式 failFast (true)
     */</span>
    <span class="token keyword">private</span> <span class="token keyword">static</span> Validator validator <span class="token operator">=</span> Validation<span class="token punctuation">.</span><span class="token function">byProvider</span><span class="token punctuation">(</span>HibernateValidator<span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">configure</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">failFast</span><span class="token punctuation">(</span><span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">buildValidatorFactory</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getValidator</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token comment">/**
     * 校验对象
     *
     * @param t bean
     * @param groups 校验组
     * @return ValidResult
     */</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token generics function"><span class="token punctuation"><</span>T<span class="token punctuation">></span></span> ValidResult <span class="token function">validateBean</span><span class="token punctuation">(</span>T t<span class="token punctuation">,</span>Class<span class="token operator"><</span><span class="token operator">?</span><span class="token operator">></span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>groups<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        ValidResult result <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ValidationUtil</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token keyword">new</span> <span class="token class-name">ValidResult</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        Set<span class="token operator"><</span>ConstraintViolation<span class="token generics function"><span class="token punctuation"><</span>T<span class="token punctuation">></span></span><span class="token operator">></span> violationSet <span class="token operator">=</span> validator<span class="token punctuation">.</span><span class="token function">validate</span><span class="token punctuation">(</span>t<span class="token punctuation">,</span>groups<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">boolean</span> hasError <span class="token operator">=</span> violationSet <span class="token operator">!=</span> null <span class="token operator">&&</span> violationSet<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">></span> <span class="token number">0</span><span class="token punctuation">;</span>
        result<span class="token punctuation">.</span><span class="token function">setHasErrors</span><span class="token punctuation">(</span>hasError<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>hasError<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">for</span> <span class="token punctuation">(</span>ConstraintViolation<span class="token generics function"><span class="token punctuation"><</span>T<span class="token punctuation">></span></span> violation <span class="token operator">:</span> violationSet<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                result<span class="token punctuation">.</span><span class="token function">addError</span><span class="token punctuation">(</span>violation<span class="token punctuation">.</span><span class="token function">getPropertyPath</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> violation<span class="token punctuation">.</span><span class="token function">getMessage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">return</span> result<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    <span class="token comment">/**
     * 校验bean的某一个属性
     *
     * @param obj          bean
     * @param propertyName 属性名称
     * @return ValidResult
     */</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token generics function"><span class="token punctuation"><</span>T<span class="token punctuation">></span></span> ValidResult <span class="token function">validateProperty</span><span class="token punctuation">(</span>T obj<span class="token punctuation">,</span> String propertyName<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        ValidResult result <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ValidationUtil</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token keyword">new</span> <span class="token class-name">ValidResult</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        Set<span class="token operator"><</span>ConstraintViolation<span class="token generics function"><span class="token punctuation"><</span>T<span class="token punctuation">></span></span><span class="token operator">></span> violationSet <span class="token operator">=</span> validator<span class="token punctuation">.</span><span class="token function">validateProperty</span><span class="token punctuation">(</span>obj<span class="token punctuation">,</span> propertyName<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">boolean</span> hasError <span class="token operator">=</span> violationSet <span class="token operator">!=</span> null <span class="token operator">&&</span> violationSet<span class="token punctuation">.</span><span class="token function">size</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">></span> <span class="token number">0</span><span class="token punctuation">;</span>
        result<span class="token punctuation">.</span><span class="token function">setHasErrors</span><span class="token punctuation">(</span>hasError<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>hasError<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">for</span> <span class="token punctuation">(</span>ConstraintViolation<span class="token generics function"><span class="token punctuation"><</span>T<span class="token punctuation">></span></span> violation <span class="token operator">:</span> violationSet<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                result<span class="token punctuation">.</span><span class="token function">addError</span><span class="token punctuation">(</span>propertyName<span class="token punctuation">,</span> violation<span class="token punctuation">.</span><span class="token function">getMessage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">return</span> result<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    <span class="token comment">/**
     * 校验结果类
     */</span>
    <span class="token annotation punctuation">@Data</span>
    <span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ValidResult</span> <span class="token punctuation">{</span>

        <span class="token comment">/**
         * 是否有错误
         */</span>
        <span class="token keyword">private</span> <span class="token keyword">boolean</span> hasErrors<span class="token punctuation">;</span>

        <span class="token comment">/**
         * 错误信息
         */</span>
        <span class="token keyword">private</span> List<span class="token generics function"><span class="token punctuation"><</span>ErrorMessage<span class="token punctuation">></span></span> errors<span class="token punctuation">;</span>

        <span class="token keyword">public</span> <span class="token function">ValidResult</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">this</span><span class="token punctuation">.</span>errors <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token operator"><</span><span class="token operator">></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">public</span> <span class="token keyword">boolean</span> <span class="token function">hasErrors</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">return</span> hasErrors<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setHasErrors</span><span class="token punctuation">(</span><span class="token keyword">boolean</span> hasErrors<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">this</span><span class="token punctuation">.</span>hasErrors <span class="token operator">=</span> hasErrors<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token comment">/**
         * 获取所有验证信息
         * @return 集合形式
         */</span>
        <span class="token keyword">public</span> List<span class="token generics function"><span class="token punctuation"><</span>ErrorMessage<span class="token punctuation">></span></span> <span class="token function">getAllErrors</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">return</span> errors<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token comment">/**
         * 获取所有验证信息
         * @return 字符串形式
         */</span>
        <span class="token keyword">public</span> String <span class="token function">getErrors</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            StringBuilder sb <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">StringBuilder</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">for</span> <span class="token punctuation">(</span>ErrorMessage error <span class="token operator">:</span> errors<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                sb<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span>error<span class="token punctuation">.</span><span class="token function">getPropertyPath</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span><span class="token string">":"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span>error<span class="token punctuation">.</span><span class="token function">getMessage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span><span class="token string">" "</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            <span class="token keyword">return</span> sb<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addError</span><span class="token punctuation">(</span>String propertyName<span class="token punctuation">,</span> String message<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">this</span><span class="token punctuation">.</span>errors<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">ErrorMessage</span><span class="token punctuation">(</span>propertyName<span class="token punctuation">,</span> message<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>

    <span class="token annotation punctuation">@Data</span>
    <span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ErrorMessage</span> <span class="token punctuation">{</span>

        <span class="token keyword">private</span> String propertyPath<span class="token punctuation">;</span>

        <span class="token keyword">private</span> String message<span class="token punctuation">;</span>

        <span class="token keyword">public</span> <span class="token function">ErrorMessage</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token punctuation">}</span>

        <span class="token keyword">public</span> <span class="token function">ErrorMessage</span><span class="token punctuation">(</span>String propertyPath<span class="token punctuation">,</span> String message<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token keyword">this</span><span class="token punctuation">.</span>propertyPath <span class="token operator">=</span> propertyPath<span class="token punctuation">;</span>
            <span class="token keyword">this</span><span class="token punctuation">.</span>message <span class="token operator">=</span> message<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>

<span class="token punctuation">}</span>
</code></pre> 
  <p>4.controller层使用</p> 
  <pre><code class="prism language-java">    <span class="token annotation punctuation">@PostMapping</span><span class="token punctuation">(</span><span class="token string">"/regist"</span><span class="token punctuation">)</span>
    <span class="token annotation punctuation">@ResponseBody</span>
    <span class="token keyword">public</span> Result <span class="token function">doregist</span><span class="token punctuation">(</span> MUser user<span class="token punctuation">,</span>String repass<span class="token punctuation">,</span>String vercode<span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token comment">//验证表单信息是否符合</span>
        ValidationUtil<span class="token punctuation">.</span>ValidResult validResult <span class="token operator">=</span> ValidationUtil<span class="token punctuation">.</span><span class="token function">validateBean</span><span class="token punctuation">(</span>user<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>validResult<span class="token punctuation">.</span><span class="token function">hasErrors</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token keyword">return</span> Result<span class="token punctuation">.</span><span class="token function">fail</span><span class="token punctuation">(</span>validResult<span class="token punctuation">.</span><span class="token function">getErrors</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> 
  <h2>十四.使用MP的插入方法小心主键会使用它自己的生成策略</h2> 
  <p>1.配置文件</p> 
  <pre><code class="prism language-yaml"><span class="token key atrule">mybatis-plus</span><span class="token punctuation">:</span>
  <span class="token key atrule">mapper-locations</span><span class="token punctuation">:</span> classpath*<span class="token punctuation">:</span>/mapper/*<span class="token important">*Mapper</span>.xml
  <span class="token key atrule">type-aliases-package</span><span class="token punctuation">:</span> com.wcy.eblog.*
  <span class="token key atrule">global-config</span><span class="token punctuation">:</span>
    <span class="token key atrule">db-config</span><span class="token punctuation">:</span>
      <span class="token key atrule">id-type</span><span class="token punctuation">:</span> auto <span class="token comment">#使用mybatis-plus的插入时主键使用数据库自增</span>
</code></pre> 
  <p>2.实体类ID上加上@TableId(value = “id”,type = IdType.AUTO)使用数据库的自增</p> 
  <pre><code class="prism language-java">    <span class="token annotation punctuation">@TableId</span><span class="token punctuation">(</span>value <span class="token operator">=</span> <span class="token string">"id"</span><span class="token punctuation">,</span>type <span class="token operator">=</span> IdType<span class="token punctuation">.</span>AUTO<span class="token punctuation">)</span>
    <span class="token keyword">private</span> Long id<span class="token punctuation">;</span>
</code></pre> 
  <h2>十五.不小心用了MP的主键生成策略，如何把主键序列重写修改</h2> 
  <p>1，删除原有主键：</p> 
  <pre><code class="prism language-yml">ALTER TABLE `table_name` DROP `id`;
</code></pre> 
  <p>2，添加新主键字段：</p> 
  <pre><code class="prism language-java">ALTER TABLE `table_name` ADD `id` <span class="token function">INT</span><span class="token punctuation">(</span> <span class="token number">11</span> <span class="token punctuation">)</span> NOT NULL FIRST<span class="token punctuation">;</span>
</code></pre> 
  <p>3，设置新主键：</p> 
  <pre><code class="prism language-java">ALTER TABLE `table_name` MODIFY COLUMN `id` <span class="token function">INT</span><span class="token punctuation">(</span> <span class="token number">11</span> <span class="token punctuation">)</span> NOT NULL AUTO_INCREMENT<span class="token punctuation">,</span>ADD PRIMARY <span class="token function">KEY</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> 
  <h2>十六.springboot中使用shiro</h2> 
  <p>shirod重要的三部分</p> 
  <ul> 
   <li>1.获取subject（用户）</li> 
   <li>2.shiro有自己的session，无http中的session无关</li> 
   <li>3.判断是否认证</li> 
   <li>4.获取token</li> 
   <li>5.是否有某个角色</li> 
   <li>6.是否有某个权限</li> 
   <li>7.注销<br> <a href="http://img.e-com-net.com/image/info8/f3f0cae7972c48e8b2978b002b1017c3.jpg" target="_blank"><img src="http://img.e-com-net.com/image/info8/f3f0cae7972c48e8b2978b002b1017c3.jpg" alt="SpringBoot+Mybatis Plus开发博客系统_第4张图片" width="494" height="167" style="border:1px solid black;"></a><br> 1.导入依赖</li> 
  </ul> 
  <pre><code class="prism language-java">        <span class="token operator"><</span><span class="token operator">!</span><span class="token operator">--</span>shiro权限框架<span class="token operator">--</span><span class="token operator">></span>
        <span class="token generics function"><span class="token punctuation"><</span>dependency<span class="token punctuation">></span></span>
            <span class="token generics function"><span class="token punctuation"><</span>groupId<span class="token punctuation">></span></span>org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>shiro<span class="token operator"><</span><span class="token operator">/</span>groupId<span class="token operator">></span>
            <span class="token generics function"><span class="token punctuation"><</span>artifactId<span class="token punctuation">></span></span>shiro<span class="token operator">-</span>spring<span class="token operator"><</span><span class="token operator">/</span>artifactId<span class="token operator">></span>
            <span class="token generics function"><span class="token punctuation"><</span>version<span class="token punctuation">></span></span><span class="token number">1.4</span><span class="token number">.0</span><span class="token operator"><</span><span class="token operator">/</span>version<span class="token operator">></span>
        <span class="token operator"><</span><span class="token operator">/</span>dependency<span class="token operator">></span>
        <span class="token operator"><</span><span class="token operator">!</span><span class="token operator">--</span>thymeleaf中使用shiro的标签<span class="token operator">--</span><span class="token operator">></span>
        <span class="token generics function"><span class="token punctuation"><</span>dependency<span class="token punctuation">></span></span>
            <span class="token generics function"><span class="token punctuation"><</span>groupId<span class="token punctuation">></span></span>com<span class="token punctuation">.</span>github<span class="token punctuation">.</span>theborakompanioni<span class="token operator"><</span><span class="token operator">/</span>groupId<span class="token operator">></span>
            <span class="token generics function"><span class="token punctuation"><</span>artifactId<span class="token punctuation">></span></span>thymeleaf<span class="token operator">-</span>extras<span class="token operator">-</span>shiro<span class="token operator"><</span><span class="token operator">/</span>artifactId<span class="token operator">></span>
            <span class="token generics function"><span class="token punctuation"><</span>version<span class="token punctuation">></span></span><span class="token number">2.0</span><span class="token number">.0</span><span class="token operator"><</span><span class="token operator">/</span>version<span class="token operator">></span>
        <span class="token operator"><</span><span class="token operator">/</span>dependency<span class="token operator">></span>
</code></pre> 
  <p>2.自定义XXXRealm 继承AuthorizingRealm用于授权和认证<br> <strong>授权的设置：</strong><br> <a href="http://img.e-com-net.com/image/info8/a0ff6f4665be4841939517620f76021e.jpg" target="_blank"><img src="http://img.e-com-net.com/image/info8/a0ff6f4665be4841939517620f76021e.jpg" alt="SpringBoot+Mybatis Plus开发博客系统_第5张图片" width="548" height="311" style="border:1px solid black;"></a></p> 
  <pre><code class="prism language-java"><span class="token annotation punctuation">@Component</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">AccountRealm</span> <span class="token keyword">extends</span> <span class="token class-name">AuthorizingRealm</span> <span class="token punctuation">{</span>
    <span class="token annotation punctuation">@Autowired</span>
    <span class="token keyword">private</span> MUserService mUserService<span class="token punctuation">;</span>
    <span class="token comment">//模拟授权 实际应该查库</span>
    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">protected</span> AuthorizationInfo <span class="token function">doGetAuthorizationInfo</span><span class="token punctuation">(</span>PrincipalCollection principalCollection<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                AccountProfile profile<span class="token operator">=</span> <span class="token punctuation">(</span>AccountProfile<span class="token punctuation">)</span> principalCollection<span class="token punctuation">.</span><span class="token function">getPrimaryPrincipal</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//模拟给用户9赋予Admin权限</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>profile<span class="token punctuation">.</span><span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">==</span> <span class="token number">9</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            SimpleAuthorizationInfo info<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">SimpleAuthorizationInfo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            info<span class="token punctuation">.</span><span class="token function">addRole</span><span class="token punctuation">(</span><span class="token string">"admin"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">return</span> info<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">return</span> null<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token comment">/**
     * 用于用户登录认证
     */</span>
    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">protected</span> AuthenticationInfo <span class="token function">doGetAuthenticationInfo</span><span class="token punctuation">(</span>AuthenticationToken authenticationToken<span class="token punctuation">)</span> <span class="token keyword">throws</span> AuthenticationException <span class="token punctuation">{</span>
        UsernamePasswordToken token<span class="token operator">=</span> <span class="token punctuation">(</span>UsernamePasswordToken<span class="token punctuation">)</span> authenticationToken<span class="token punctuation">;</span>
        String email <span class="token operator">=</span> token<span class="token punctuation">.</span><span class="token function">getUsername</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//查询数据库进行操作</span>
        AccountProfile profile<span class="token operator">=</span>mUserService<span class="token punctuation">.</span><span class="token function">login</span><span class="token punctuation">(</span>token<span class="token punctuation">.</span><span class="token function">getUsername</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span>String<span class="token punctuation">.</span><span class="token function">valueOf</span><span class="token punctuation">(</span>token<span class="token punctuation">.</span><span class="token function">getPassword</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        SimpleAuthenticationInfo info <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">SimpleAuthenticationInfo</span><span class="token punctuation">(</span>profile<span class="token punctuation">,</span> token<span class="token punctuation">.</span><span class="token function">getCredentials</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token function">getName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> info<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> 
  <p>3.登录的controller</p> 
  <pre><code class="prism language-java">    <span class="token annotation punctuation">@PostMapping</span><span class="token punctuation">(</span><span class="token string">"login"</span><span class="token punctuation">)</span>
    <span class="token annotation punctuation">@ResponseBody</span>
    <span class="token keyword">public</span> Result <span class="token function">doLogin</span><span class="token punctuation">(</span>String email<span class="token punctuation">,</span>String password<span class="token punctuation">,</span>String vercode<span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>StringUtils<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span>email<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token keyword">return</span> Result<span class="token punctuation">.</span><span class="token function">fail</span><span class="token punctuation">(</span><span class="token string">"请填写邮箱"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>StringUtils<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span>password<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token keyword">return</span> Result<span class="token punctuation">.</span><span class="token function">fail</span><span class="token punctuation">(</span><span class="token string">"请填写密码"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>StringUtils<span class="token punctuation">.</span><span class="token function">isEmpty</span><span class="token punctuation">(</span>vercode<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token keyword">return</span> Result<span class="token punctuation">.</span><span class="token function">fail</span><span class="token punctuation">(</span><span class="token string">"验证码不能为空"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        String kapchat <span class="token operator">=</span> <span class="token punctuation">(</span>String<span class="token punctuation">)</span>req<span class="token punctuation">.</span><span class="token function">getSession</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getAttribute</span><span class="token punctuation">(</span>Constants<span class="token punctuation">.</span>KAPTCHA_SESSION_KEY<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token operator">!</span>vercode<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>kapchat<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token keyword">return</span> Result<span class="token punctuation">.</span><span class="token function">fail</span><span class="token punctuation">(</span><span class="token string">"验证码错误"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        UsernamePasswordToken token<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">UsernamePasswordToken</span><span class="token punctuation">(</span>email<span class="token punctuation">,</span> DigestUtil<span class="token punctuation">.</span><span class="token function">md5Hex</span><span class="token punctuation">(</span>password<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">try</span><span class="token punctuation">{</span>
            <span class="token comment">//使用shiro进行登录</span>
            SecurityUtils<span class="token punctuation">.</span><span class="token function">getSubject</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">login</span><span class="token punctuation">(</span>token<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">AuthenticationException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token comment">//进行登录会产生下面的异常</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span>e <span class="token keyword">instanceof</span> <span class="token class-name">UnknownAccountException</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
                <span class="token keyword">return</span> Result<span class="token punctuation">.</span><span class="token function">fail</span><span class="token punctuation">(</span><span class="token string">"用户不存在"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>e <span class="token keyword">instanceof</span> <span class="token class-name">LockedAccountException</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
                <span class="token keyword">return</span> Result<span class="token punctuation">.</span><span class="token function">fail</span><span class="token punctuation">(</span><span class="token string">"用户被禁用"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>e <span class="token keyword">instanceof</span> <span class="token class-name">IncorrectCredentialsException</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
                <span class="token keyword">return</span> Result<span class="token punctuation">.</span><span class="token function">fail</span><span class="token punctuation">(</span><span class="token string">"密码错误"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
                <span class="token keyword">return</span> Result<span class="token punctuation">.</span><span class="token function">fail</span><span class="token punctuation">(</span><span class="token string">"用户认证失败"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">return</span> Result<span class="token punctuation">.</span><span class="token function">success</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">action</span><span class="token punctuation">(</span><span class="token string">"/"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
</code></pre> 
  <p>4.shiro的配置类</p> 
  <pre><code class="prism language-java"><span class="token comment">/**
 * 类似于拦截器
 */</span>
<span class="token annotation punctuation">@Slf4j</span>
<span class="token annotation punctuation">@Configuration</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ShiroConfig</span> <span class="token punctuation">{</span>

    <span class="token annotation punctuation">@Bean</span>
    <span class="token keyword">public</span> SecurityManager <span class="token function">securityManager</span><span class="token punctuation">(</span>AccountRealm accountRealm<span class="token punctuation">)</span><span class="token punctuation">{</span>

        DefaultWebSecurityManager securityManager <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">DefaultWebSecurityManager</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        securityManager<span class="token punctuation">.</span><span class="token function">setRealm</span><span class="token punctuation">(</span>accountRealm<span class="token punctuation">)</span><span class="token punctuation">;</span>

        log<span class="token punctuation">.</span><span class="token function">info</span><span class="token punctuation">(</span><span class="token string">"------------------>securityManager注入成功"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token keyword">return</span> securityManager<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token annotation punctuation">@Bean</span>
    <span class="token keyword">public</span> ShiroFilterFactoryBean <span class="token function">shiroFilterFactoryBean</span><span class="token punctuation">(</span>SecurityManager securityManager<span class="token punctuation">)</span> <span class="token punctuation">{</span>

        ShiroFilterFactoryBean filterFactoryBean <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ShiroFilterFactoryBean</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        filterFactoryBean<span class="token punctuation">.</span><span class="token function">setSecurityManager</span><span class="token punctuation">(</span>securityManager<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">// 配置登录的url和登录成功的url</span>
        filterFactoryBean<span class="token punctuation">.</span><span class="token function">setLoginUrl</span><span class="token punctuation">(</span><span class="token string">"/login"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        filterFactoryBean<span class="token punctuation">.</span><span class="token function">setSuccessUrl</span><span class="token punctuation">(</span><span class="token string">"/user/center"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">// 配置未授权跳转页面</span>
        filterFactoryBean<span class="token punctuation">.</span><span class="token function">setUnauthorizedUrl</span><span class="token punctuation">(</span><span class="token string">"/error/403"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        Map<span class="token generics function"><span class="token punctuation"><</span>String<span class="token punctuation">,</span> String<span class="token punctuation">></span></span> hashMap <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">LinkedHashMap</span><span class="token operator"><</span><span class="token operator">></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//        hashMap.put("/res/**", "anon");</span>
<span class="token comment">//</span>
<span class="token comment">//        hashMap.put("/user/home", "auth");</span>
<span class="token comment">//        hashMap.put("/user/set", "auth");</span>
<span class="token comment">//        hashMap.put("/user/upload", "auth");</span>
<span class="token comment">//        hashMap.put("/user/index", "auth");</span>
<span class="token comment">//        hashMap.put("/user/public", "auth");</span>
<span class="token comment">//        hashMap.put("/user/collection", "auth");</span>
<span class="token comment">//        hashMap.put("/user/mess", "auth");</span>
<span class="token comment">//        hashMap.put("/msg/remove/", "auth");</span>
<span class="token comment">//        hashMap.put("/message/nums/", "auth");</span>
<span class="token comment">//</span>
<span class="token comment">//        hashMap.put("/collection/remove/", "auth");</span>
<span class="token comment">//        hashMap.put("/collection/find/", "auth");</span>
<span class="token comment">//        hashMap.put("/collection/add/", "auth");</span>
<span class="token comment">//</span>
<span class="token comment">//        hashMap.put("/post/edit", "auth");</span>
<span class="token comment">//        hashMap.put("/post/submit", "auth");</span>
<span class="token comment">//        hashMap.put("/post/delete", "auth");</span>
<span class="token comment">//        hashMap.put("/post/reply/", "auth");</span>
<span class="token comment">//</span>
<span class="token comment">//        hashMap.put("/websocket", "anon");</span>
        hashMap<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token string">"/login"</span><span class="token punctuation">,</span> <span class="token string">"anon"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        filterFactoryBean<span class="token punctuation">.</span><span class="token function">setFilterChainDefinitionMap</span><span class="token punctuation">(</span>hashMap<span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token keyword">return</span> filterFactoryBean<span class="token punctuation">;</span>

    <span class="token punctuation">}</span>

    <span class="token operator">/</span><span class="token operator">*</span><span class="token operator">*</span>
     <span class="token operator">*</span> 用于thymeleaf模板与shiro的标签
     <span class="token operator">*</span> @<span class="token keyword">return</span>
     <span class="token operator">*</span><span class="token operator">/</span>
    <span class="token annotation punctuation">@Bean</span>
    <span class="token keyword">public</span> ShiroDialect <span class="token function">shiroDialect</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">ShiroDialect</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> 
  <p>5.thymeleaf使用标签：<br> 1.引入：</p> 
  <pre><code class="prism language-yaml"><html xmlns<span class="token punctuation">:</span>shiro="http<span class="token punctuation">:</span>//www.pollix.at/thymeleaf/shiro"<span class="token punctuation">></span>
</code></pre> 
  <p>2.标签：</p> 
  <pre><code class="prism language-yaml">guest标签
　　<shiro<span class="token punctuation">:</span>guest<span class="token punctuation">></span>
　　</shiro<span class="token punctuation">:</span>guest<span class="token punctuation">></span>
　　用户没有身份验证时显示相应信息，即游客访问信息。

user标签
　　<shiro<span class="token punctuation">:</span>user<span class="token punctuation">></span>　　
　　</shiro<span class="token punctuation">:</span>user<span class="token punctuation">></span>
　　用户已经身份验证/记住我登录后显示相应的信息。

authenticated标签
　　<shiro<span class="token punctuation">:</span>authenticated<span class="token punctuation">></span>　　
　　</shiro<span class="token punctuation">:</span>authenticated<span class="token punctuation">></span>
　　用户已经身份验证通过，即Subject.login登录成功，不是记住我登录的。

notAuthenticated标签
　　<shiro<span class="token punctuation">:</span>notAuthenticated<span class="token punctuation">></span>
　　
　　</shiro<span class="token punctuation">:</span>notAuthenticated<span class="token punctuation">></span>
　　用户已经身份验证通过，即没有调用Subject.login进行登录，包括记住我自动登录的也属于未进行身份验证。

principal标签
　　<shiro<span class="token punctuation">:</span> principal/<span class="token punctuation">></span>
　　
　　<shiro<span class="token punctuation">:</span>principal property="username"/<span class="token punctuation">></span>
　　相当于((User)Subject.getPrincipals()).getUsername()。

lacksPermission标签
　　<shiro<span class="token punctuation">:</span>lacksPermission name="org<span class="token punctuation">:</span>create"<span class="token punctuation">></span>
　
　　</shiro<span class="token punctuation">:</span>lacksPermission<span class="token punctuation">></span>
　　如果当前Subject没有权限将显示body体内容。

hasRole标签
　　<shiro<span class="token punctuation">:</span>hasRole name="admin"<span class="token punctuation">></span>　　
　　</shiro<span class="token punctuation">:</span>hasRole<span class="token punctuation">></span>
　　如果当前Subject有角色将显示body体内容。

hasAnyRoles标签
　　<shiro<span class="token punctuation">:</span>hasAnyRoles name="admin<span class="token punctuation">,</span>user"<span class="token punctuation">></span>
　　　
　　</shiro<span class="token punctuation">:</span>hasAnyRoles<span class="token punctuation">></span>
　　如果当前Subject有任意一个角色（或的关系）将显示body体内容。

lacksRole标签
　　<shiro<span class="token punctuation">:</span>lacksRole name="abc"<span class="token punctuation">></span>　　
　　</shiro<span class="token punctuation">:</span>lacksRole<span class="token punctuation">></span>
　　如果当前Subject没有角色将显示body体内容。

hasPermission标签
　　<shiro<span class="token punctuation">:</span>hasPermission name="user<span class="token punctuation">:</span>create"<span class="token punctuation">></span>　　
　　</shiro<span class="token punctuation">:</span>hasPermission<span class="token punctuation">></span>
　　如果当前Subject有权限将显示body体内容

</code></pre> 
  <h2>十七.thymeleaf中标签的属性上如何shiro标签</h2> 
  <p>问题：<br> <strong><shiro:principal property=“avatar”/>只能只能作用于标签的内容上，不能作用于属性上。</strong><br> 解决：<br> 1.我们可以随便设置一个div标签，然后把值给div<br> 2.再通过js获取div的值，然后赋值src或href等等标签属性上面</p> 
  <pre><code class="prism language-yaml">      <div style="display<span class="token punctuation">:</span> none" id="div_avatar"<span class="token punctuation">></span><shiro<span class="token punctuation">:</span>principal property="avatar"/<span class="token punctuation">></span></div<span class="token punctuation">></span>
      <img src="" id="img_avatar"/<span class="token punctuation">></span>
      <script<span class="token punctuation">></span>
          $(function () <span class="token punctuation">{</span>
             var avatar=$('<span class="token comment">#div_avatar').html();</span>
             $('<span class="token comment">#img_avatar').attr("src",avatar)</span>
             console.log(avatar)
          <span class="token punctuation">}</span>)
     </script<span class="token punctuation">></span>
</code></pre> 
  <h2>十八.thymeleaf中判断list是否为空</h2> 
  <p><strong>不为空：</strong></p> 
  <pre><code class="prism language-yaml">th<span class="token punctuation">:</span>if="$<span class="token punctuation">{</span>not <span class="token comment">#lists.isEmpty(listData)}"</span>
</code></pre> 
  <p><strong>为空：</strong></p> 
  <pre><code class="prism language-yaml">th<span class="token punctuation">:</span>if="$<span class="token punctuation">{</span><span class="token comment">#lists.isEmpty(listData)}"</span>
</code></pre> 
  <h2>十九.批量删除文件（忽略后缀）</h2> 
  <pre><code class="prism language-java">    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">deleteFileSuff</span><span class="token punctuation">(</span>File file<span class="token punctuation">,</span>String fileName<span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token comment">//批量删除忽略后缀的文件</span>
        String<span class="token punctuation">[</span><span class="token punctuation">]</span> list <span class="token operator">=</span> file<span class="token punctuation">.</span><span class="token function">list</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">for</span><span class="token punctuation">(</span>String temp<span class="token operator">:</span>list<span class="token punctuation">)</span><span class="token punctuation">{</span>
            String name<span class="token operator">=</span>temp<span class="token punctuation">.</span><span class="token function">substring</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span>temp<span class="token punctuation">.</span><span class="token function">indexOf</span><span class="token punctuation">(</span><span class="token string">"."</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            String nameSuffix<span class="token operator">=</span>temp<span class="token punctuation">.</span><span class="token function">substring</span><span class="token punctuation">(</span>temp<span class="token punctuation">.</span><span class="token function">indexOf</span><span class="token punctuation">(</span><span class="token string">"."</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token keyword">if</span><span class="token punctuation">(</span>name<span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>fileName<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
                File file1<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">File</span><span class="token punctuation">(</span>file<span class="token punctuation">.</span><span class="token function">getAbsolutePath</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">+</span><span class="token string">"/"</span><span class="token operator">+</span>fileName<span class="token operator">+</span>nameSuffix<span class="token punctuation">)</span><span class="token punctuation">;</span>
                file1<span class="token punctuation">.</span><span class="token function">delete</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
</code></pre> 
  <h2>二十.springboot上传图片</h2> 
  <p><strong>1.yml配置：${user.dir}是获取容器src路径的绝对路径</strong></p> 
  <pre><code class="prism language-yaml"><span class="token comment">#文件下载路径  ${user.dir}可以获取容器即src路径的绝对路径   记得最后的/</span>
<span class="token key atrule">file</span><span class="token punctuation">:</span>
  <span class="token key atrule">upload</span><span class="token punctuation">:</span>
    <span class="token key atrule">dir</span><span class="token punctuation">:</span> $<span class="token punctuation">{</span>user.dir<span class="token punctuation">}</span>/upload/
</code></pre> 
  <p><strong>2.配置类;一但发起/upload请求就会映射到${user.dir}/upload/路径下面，我们只需要再返回图片的路径就可以了</strong></p> 
  <pre><code class="prism language-java"><span class="token annotation punctuation">@Configuration</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">MyMvcConfig</span> <span class="token keyword">implements</span> <span class="token class-name">WebMvcConfigurer</span><span class="token punctuation">{</span>
    <span class="token annotation punctuation">@Value</span><span class="token punctuation">(</span><span class="token string">"${file.upload.dir}"</span><span class="token punctuation">)</span>
    <span class="token keyword">private</span> String uploadPath<span class="token punctuation">;</span><span class="token comment">//获取配置文件的路径 这样可以随时配置图片上传路径</span>

    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addResourceHandlers</span><span class="token punctuation">(</span>ResourceHandlerRegistry registry<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token comment">//资源映射  用于图片显示</span>
        registry<span class="token punctuation">.</span><span class="token function">addResourceHandler</span><span class="token punctuation">(</span><span class="token string">"/upload/**"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">addResourceLocations</span><span class="token punctuation">(</span><span class="token string">"file:"</span><span class="token operator">+</span>uploadPath<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

<span class="token punctuation">}</span>
</code></pre> 
  <p>3.比如返回路径为：/upload/user/avatar"+newName 这样前端展示这个url就可以了。</p> 
  <pre><code class="prism language-java"><span class="token keyword">return</span> Result<span class="token punctuation">.</span><span class="token function">success</span><span class="token punctuation">(</span><span class="token string">"/upload/user/avatar"</span><span class="token operator">+</span>newName<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> 
  <h2>二十二.layui流和layui的模板引擎</h2> 
  <p>一个类似于流的形式的页面<br> <a href="http://img.e-com-net.com/image/info8/dac002557030485c8a39dc84246188d6.jpg" target="_blank"><img src="http://img.e-com-net.com/image/info8/dac002557030485c8a39dc84246188d6.jpg" alt="SpringBoot+Mybatis Plus开发博客系统_第6张图片" width="650" height="130" style="border:1px solid black;"></a><br> <strong>1.首先使用layui的模板引擎定义一个显示的item</strong><br> 其中使用了layui的时间工具类 这里面没法使用thymeleaf的语法</p> 
  <pre><code class="prism language-yaml"><ul class="mine<span class="token punctuation">-</span>view jie<span class="token punctuation">-</span>row" id="fabu"<span class="token punctuation">></span>

            <script id="lpl_fabu" type="text/html" th<span class="token punctuation">:</span>inline="javascript"<span class="token punctuation">></span>
              <li<span class="token punctuation">></span>
                <a class="jie<span class="token punctuation">-</span>title" th<span class="token punctuation">:</span>href="@<span class="token punctuation">{</span>/post/post/<span class="token punctuation">{</span><span class="token punctuation">{</span>d.id<span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token punctuation">}</span>" target="_blank"<span class="token punctuation">></span><span class="token punctuation">{</span><span class="token punctuation">{</span>d.title<span class="token punctuation">}</span><span class="token punctuation">}</span></a<span class="token punctuation">></span>
                <i<span class="token punctuation">></span><span class="token punctuation">{</span><span class="token punctuation">{</span>layui.util.toDateString(d.created<span class="token punctuation">,</span> 'yyyy<span class="token punctuation">-</span>MM<span class="token punctuation">-</span>dd HH<span class="token punctuation">:</span>mm<span class="token punctuation">:</span>ss')<span class="token punctuation">}</span><span class="token punctuation">}</span></i<span class="token punctuation">></span>
                <a class="mine<span class="token punctuation">-</span>edit" href="/jie/edit/8116"<span class="token punctuation">></span>编辑</a<span class="token punctuation">></span>
                <em<span class="token punctuation">></span><span class="token punctuation">{</span><span class="token punctuation">{</span>d.viewCount<span class="token punctuation">}</span><span class="token punctuation">}</span>阅/<span class="token punctuation">{</span><span class="token punctuation">{</span>d.commentCount<span class="token punctuation">}</span><span class="token punctuation">}</span>答</em<span class="token punctuation">></span>
              </li<span class="token punctuation">></span>
            </script<span class="token punctuation">></span>

          </ul<span class="token punctuation">></span>
</code></pre> 
  <p><strong>2.js的代码</strong></p> 
  <pre><code class="prism language-yaml">    $(function () <span class="token punctuation">{</span>
        layui.use(<span class="token punctuation">[</span><span class="token string">'flow'</span><span class="token punctuation">,</span><span class="token string">'laytpl'</span><span class="token punctuation">,</span><span class="token string">'util'</span><span class="token punctuation">]</span><span class="token punctuation">,</span> function()<span class="token punctuation">{</span>
            var $ = layui.jquery; //不用额外加载jQuery，flow模块本身是有依赖jQuery的，直接用即可。
            var flow = layui.flow;
            var laytpl = layui.laytpl;
            var util = layui.util;
            //流加载的容器
            flow.load(<span class="token punctuation">{</span>
                <span class="token key atrule">elem</span><span class="token punctuation">:</span> <span class="token string">'#fabu'</span><span class="token punctuation">,</span> //指定列表容器 放在哪个容器里面
                isAuto<span class="token punctuation">:</span>false  //不自动加载
                <span class="token punctuation">,</span><span class="token key atrule">done</span><span class="token punctuation">:</span> function(page<span class="token punctuation">,</span> next)<span class="token punctuation">{</span> //到达临界点（默认滚动触发），触发下一页
                    var lis = <span class="token punctuation">[</span><span class="token punctuation">]</span>;

                    //以jQuery的Ajax请求为例，请求下一页数据（注意：page是从2开始返回）
                    $.get('/user/publish<span class="token punctuation">?</span>page='+page<span class="token punctuation">,</span> function(res)<span class="token punctuation">{</span>
                        //假设你的列表返回在data集合中 通过layui的循环获取数据
                        layui.each(res.data.records<span class="token punctuation">,</span> function(index<span class="token punctuation">,</span> item)<span class="token punctuation">{</span>
                            //通过layui的自定义数据模板 lpl_fabu.innerHTML是模板引擎的ID并显示html
                            laytpl(lpl_fabu.innerHTML).render(item<span class="token punctuation">,</span> function(html)<span class="token punctuation">{</span>
                                //放进数组中
                                lis.push(html);
                            <span class="token punctuation">}</span>);
                        <span class="token punctuation">}</span>);

                        //执行下一页渲染，第二参数为：满足“加载更多”的条件，即后面仍有分页
                        //pages为Ajax返回的总页数，只有当前页小于总页数的情况下，才会继续出现加载更多
                        next(lis.join('')<span class="token punctuation">,</span> page < res.data.pages);
                    <span class="token punctuation">}</span>);
                <span class="token punctuation">}</span>
            <span class="token punctuation">}</span>);
        <span class="token punctuation">}</span>);
    <span class="token punctuation">}</span>)
</code></pre> 
  <h2>二十三.对于多表查询如果涉及到四个表以上不推荐使用left join</h2> 
  <p><strong>通过内部查询的方式来查询设计多表的查询</strong></p> 
  <pre><code class="prism language-yaml">SELECT
            m.*<span class="token punctuation">,</span> (
                SELECT
                    username
                FROM
                    m_user
                WHERE
                    id = m.from_user_id
            ) AS fromUserName<span class="token punctuation">,</span>
            (
                SELECT
                    title
                FROM
                    m_post
                WHERE
                    id = m.post_id
            ) AS blogTitle<span class="token punctuation">,</span>
            (
                SELECT
                    content
                FROM
                    m_comment
                WHERE
                    id = m.comment_id
            ) AS commentContent
        FROM
            m_user_message m
        WHERE
            to_user_id=<span class="token comment">#{id}</span>
        ORDER BY created DESC
</code></pre> 
  <h2>二十四.shiro中对ajax的自定义过滤器</h2> 
  <p><strong>1.自定义过滤器</strong></p> 
  <pre><code class="prism language-java"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">AuthFilter</span> <span class="token keyword">extends</span> <span class="token class-name">UserFilter</span> <span class="token punctuation">{</span>
    <span class="token comment">//重写没有登录重定向的方法</span>
    <span class="token annotation punctuation">@Override</span>
    <span class="token keyword">protected</span> <span class="token keyword">void</span> <span class="token function">redirectToLogin</span><span class="token punctuation">(</span>ServletRequest request<span class="token punctuation">,</span> ServletResponse response<span class="token punctuation">)</span> <span class="token keyword">throws</span> IOException <span class="token punctuation">{</span>
        HttpServletRequest httpServletRequest<span class="token operator">=</span> <span class="token punctuation">(</span>HttpServletRequest<span class="token punctuation">)</span> request<span class="token punctuation">;</span>
        <span class="token comment">//X-Requested-With: XMLHttpRequest</span>
        String header <span class="token operator">=</span> httpServletRequest<span class="token punctuation">.</span><span class="token function">getHeader</span><span class="token punctuation">(</span><span class="token string">"X-Requested-With"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//1.判断是否是ajax请求</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>header <span class="token operator">!=</span> null <span class="token operator">&&</span> <span class="token string">"XMLHttpRequest"</span><span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>header<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            <span class="token keyword">boolean</span> authenticated <span class="token operator">=</span> SecurityUtils<span class="token punctuation">.</span><span class="token function">getSubject</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">isAuthenticated</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token comment">//登录回超时</span>
            <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token operator">!</span>authenticated<span class="token punctuation">)</span><span class="token punctuation">{</span>
                response<span class="token punctuation">.</span><span class="token function">setContentType</span><span class="token punctuation">(</span><span class="token string">"application/json;charset=UTF-8"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//设置字符集</span>
                JSONObject jsonObject<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">JSONObject</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                jsonObject<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token string">"msg"</span><span class="token punctuation">,</span><span class="token string">"回话超时,请重新登录"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                response<span class="token punctuation">.</span><span class="token function">getWriter</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span>jsonObject<span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span><span class="token keyword">else</span> <span class="token punctuation">{</span>
            <span class="token keyword">super</span><span class="token punctuation">.</span><span class="token function">redirectToLogin</span><span class="token punctuation">(</span>request<span class="token punctuation">,</span> response<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> 
  <p><strong>2.shiroconfig配置类中注入自定义过滤器bean</strong></p> 
  <pre><code class="prism language-java">    <span class="token comment">//把自己写的过滤器加入到容器中</span>
    <span class="token annotation punctuation">@Bean</span>
    <span class="token keyword">public</span> AuthFilter <span class="token function">authFilter</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">AuthFilter</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
</code></pre> 
  <p><strong>3.shiroFilterFactoryBean中配置自己的过滤器</strong></p> 
  <pre><code class="prism language-java"><span class="token comment">//添加自定义的过滤器</span>
        Map filterMap<span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">HashMap</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">//注意不要与内置的过滤器相同了</span>
        filterMap<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token string">"auth"</span><span class="token punctuation">,</span><span class="token function">authFilter</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        filterFactoryBean<span class="token punctuation">.</span><span class="token function">setFilters</span><span class="token punctuation">(</span>filterMap<span class="token punctuation">)</span><span class="token punctuation">;</span>


 <span class="token comment">//查看当前用户是否收藏了该博客  判断是否是ajax请求  ajax自己写一个过滤器 配置自己的过滤器</span>
        hashMap<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token string">"/collection/find/"</span><span class="token punctuation">,</span> <span class="token string">"auth"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        hashMap<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token string">"/collection/remove/"</span><span class="token punctuation">,</span> <span class="token string">"auth"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        hashMap<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token string">"/collection/add/"</span><span class="token punctuation">,</span> <span class="token string">"auth"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> 
  <h2>二十五.java中使用hutool的断言</h2> 
  <p><strong>有时候在controller中，我们返回博客详情页面，可能出现博客以及不存在，那么我们就可以使用断言，如果不满足条件，就会抛出异常。</strong><br> 比如下方 当postVo==null 就会抛出异常 <strong>（注意是相反的哦）</strong></p> 
  <pre><code class="prism language-java">        <span class="token comment">//返回博客信息</span>
        PostVo postVo<span class="token operator">=</span>mPostService<span class="token punctuation">.</span><span class="token function">findPostById</span><span class="token punctuation">(</span>id<span class="token punctuation">)</span><span class="token punctuation">;</span>
        Assert<span class="token punctuation">.</span><span class="token function">isTrue</span><span class="token punctuation">(</span>postVo<span class="token operator">!=</span>null<span class="token punctuation">,</span><span class="token string">"该文章已被删除"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> 
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                        <div>摘要随着现在网络的快速发展，网络的应用在各行各业当中它很快融入到了许多学校的眼球之中，他们利用网络来做这个电商的服务，随之就产生了“考研资讯平台”，这样就让学生考研资讯平台更加方便简单。对于本考研资讯平台的设计来说，它主要是采用java技术。在整个系统的设计当中它是应用mysql数据库来完成的，具体根据网上考研资讯平台的现状来进行开发的，具体根据学生需求实现网上考研资讯平台网络化的管理，各类信息有</div>
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<a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/thread/1.htm">thread</a><a class="tag" taget="_blank" href="/search/%E5%A4%9A%E7%BA%BF%E7%A8%8B/1.htm">多线程</a><a class="tag" taget="_blank" href="/search/%E5%AD%98%E9%92%B1/1.htm">存钱</a><a class="tag" taget="_blank" href="/search/%E5%8F%96%E9%92%B1/1.htm">取钱</a>
                                    <div>  
生活费问题是这样的：学生每月都需要生活费，家长一次预存一段时间的生活费，家长和学生使用统一的一个帐号，在学生每次取帐号中一部分钱，直到帐号中没钱时 通知家长存钱，而家长看到帐户还有钱则不存钱，直到帐户没钱时才存钱。   
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                                    <span class="text-muted">征客丶</span>
<a class="tag" taget="_blank" href="/search/JavaScript/1.htm">JavaScript</a><a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/jsonp/1.htm">jsonp</a>
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　　调用ArrayList的toArray方法。 
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                                    <span class="text-muted">daizj</span>
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<?php
if(isset($_GET["q"])){
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在sh/bash里可不能这么写，如果else分支没有语句执行，就不要写这个else，就像这样  if else if 
if 语句语</div>
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                                    <div>因为我们做的是聊天室，所以会有多个客户端，每个客户端我们用一个线程去实现，通过搭建一个服务器来实现从每个客户端来读取信息和发送信息。 
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public class ChatSocket extends Thread{ 
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 public ChatSocket(Socket socket){ 
 this.sock</div>
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项目背景介绍 
通常，保险公司信息化程度很高，基本上都有业务处理系统（像集团业务处理系统、老业务处理系统、个人代理人系统等）、数据服务系统（通过</div>
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<ifram</div>
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# binlog
log_bin = D:/mysql-5.6.21-winx64/log/binlog/mysql-bin.log
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                                    <div>近来手上有个项目,需要使用ocx控件 
(ocx是什么? 
http://baike.baidu.com/view/393671.htm) 
在生产过程中我遇到了如下问题. 
1. 如何让 ocx 自动安装? 
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    b) 如何打包? 
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2.</div>
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                                    <span class="text-muted">百合不是茶</span>
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                                    <div>  
HashMap队列已经是学过了的,但是最近在用的时候不是很熟悉,刚刚重新看以一次, 
  HashMap是K,v键 ,值   
  
put()添加元素 
  
  
 //下面试HashMap去掉重复的 
package com.hashMapandPriorityQueue;

import java.util.H</div>
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                                    <div>Callable接口： 
返回结果并且可能抛出异常的任务。实现者定义了一个不带任何参数的叫做 call 的方法。 
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ExecutorService接口方</div>
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                                    <div>        在directive的link中有一个$http请求，当请求完成后根据返回的值动态做element.append('......');这个操作，能显示没问题，可问题是我动态组的HTML里面有ng-click，发现显示出来的内容根本不执行ng-click绑定的方法！ 
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                                    <span class="text-muted">bit1129</span>
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public class Generics<M, S, N> {
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} 
 这种方式定义的范型类有两个基本的问题： 
  
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                                    <div>1. 数据从MemStore flush到磁盘的触发条件有哪些？ 
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                                    <div>mkdir /root/bin
vi /root/bin/dropip.sh
#!/bin/bash/bin/netstat -na|grep ESTABLISHED|awk ‘{print $5}’|awk -F:‘{print $1}’|sort|uniq -c|sort -rn|head -10|grep -v -E ’192.168|127.0′|awk ‘{if($2!=null&a</div>
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                                    <span class="text-muted">bylijinnan</span>
<a class="tag" taget="_blank" href="/search/java/1.htm">java</a>
                                    <div>
import java.util.Random;


public class CrapsGame {

	/**
	 *
	 *一个简单的赌*博游戏，游戏规则如下：
	 *玩家掷两个骰子，点数为1到6，如果第一次点数和为7或11，则玩家胜，
	 *如果点数和为2、3或12，则玩家输，
	 *如果和为其它点数，则记录第一次的点数和，然后继续掷骰，直至点数和等于第一次掷出的点</div>
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                                    <span class="text-muted">开窍的石头</span>
<a class="tag" taget="_blank" href="/search/JAVA_HOME/1.htm">JAVA_HOME</a>
                                    <div>当tomcat是解压的时候，用eclipse启动正常，点击startup.bat的时候启动报错; 
报错如下： 
  The JAVA_HOME environment variable is not defined correctly 
This environment variable is needed to run this program 
NB: JAVA_HOME shou</div>
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                                    <span class="text-muted">comsci</span>
<a class="tag" taget="_blank" href="/search/%E6%93%8D%E4%BD%9C%E7%B3%BB%E7%BB%9F/1.htm">操作系统</a>
                                    <div> 
 
     我首先申明：我这里所说的问题并不是针对哪个厂商的，仅仅是描述我对操作系统技术的一些看法 
 
 
      操作系统是一种与硬件层关系非常密切的系统软件，按理说，这种系统软件应该是由设计CPU和硬件板卡的厂商开发的，和软件公司没有直接的关系，也就是说，操作系统应该由做硬件的厂商来设计和开发</div>
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                                    <span class="text-muted">cuityang</span>
<a class="tag" taget="_blank" href="/search/%E5%AF%8C%E6%96%87%E6%9C%AC%E6%A1%86/1.htm">富文本框</a>
                                    <div><html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> 
<title>知识库内容编辑</tit</div>
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                                    <span class="text-muted">darrenzhu</span>
<a class="tag" taget="_blank" href="/search/datagrid/1.htm">datagrid</a><a class="tag" taget="_blank" href="/search/Flex/1.htm">Flex</a><a class="tag" taget="_blank" href="/search/Advanced/1.htm">Advanced</a><a class="tag" taget="_blank" href="/search/propery+null/1.htm">propery null</a>
                                    <div>When you got error message like "Property null not found ***", try to fix it by the following way: 
 
1)if you are using AdvancedDatagrid, make sure you only update the data in the data prov</div>
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                                <li><a href="/article/2596.htm"
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                                    <span class="text-muted">dcj3sjt126com</span>
<a class="tag" taget="_blank" href="/search/mysql/1.htm">mysql</a><a class="tag" taget="_blank" href="/search/%E5%87%BD%E6%95%B0/1.htm">函数</a><a class="tag" taget="_blank" href="/search/%E6%9B%BF%E6%8D%A2/1.htm">替换</a>
                                    <div>需求：需要将数据表中一个字段的值里面的所有的  .   替换成  _   
原来的数据是  site.title  site.keywords  .... 
替换后要为     site_title  site_keywords 
  
使用的SQL语句如下： 
  
updat</div>
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                                       title="mac上终端起动MySQL的方法" target="_blank">mac上终端起动MySQL的方法</a>
                                    <span class="text-muted">dcj3sjt126com</span>
<a class="tag" taget="_blank" href="/search/mysql/1.htm">mysql</a><a class="tag" taget="_blank" href="/search/mac/1.htm">mac</a>
                                    <div>首先去官网下载: http://www.mysql.com/downloads/ 
我下载了5.6.11的dmg然后安装,安装完成之后..如果要用终端去玩SQL.那么一开始要输入很长的:/usr/local/mysql/bin/mysql 
这不方便啊,好想像windows下的cmd里面一样输入mysql -uroot -p1这样...上网查了下..可以实现滴. 
打开终端,输入: 
1</div>
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                                    <span class="text-muted">eksliang</span>
<a class="tag" taget="_blank" href="/search/json/1.htm">json</a><a class="tag" taget="_blank" href="/search/gson/1.htm">gson</a>
                                    <div>转载请出自出处：http://eksliang.iteye.com/blog/2175401 一.概述 
从结构上看Json，所有的数据（data）最终都可以分解成三种类型： 
 
 第一种类型是标量（scalar），也就是一个单独的字符串（string）或数字（numbers），比如"ickes"这个字符串。 
 第二种类型是序列（sequence），又叫做数组（array）</div>
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                                       title="android点滴4" target="_blank">android点滴4</a>
                                    <span class="text-muted">gundumw100</span>
<a class="tag" taget="_blank" href="/search/android/1.htm">android</a>
                                    <div>Android 47个小知识 
 
http://www.open-open.com/lib/view/open1422676091314.html 
 
 Android实用代码七段（一） 
 
http://www.cnblogs.com/over140/archive/2012/09/26/2611999.html 
 
http://www.cnblogs.com/over140/arch</div>
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                                       title="JavaWeb之JSP基本语法" target="_blank">JavaWeb之JSP基本语法</a>
                                    <span class="text-muted">ihuning</span>
<a class="tag" taget="_blank" href="/search/javaweb/1.htm">javaweb</a>
                                    <div>  
目录 
  
JSP模版元素  
JSP表达式  
JSP脚本片断  
EL表达式  
JSP注释  
特殊字符序列的转义处理  
如何查找JSP页面中的错误 
  
JSP模版元素  
  
JSP页面中的静态HTML内容称之为JSP模版元素，在静态的HTML内容之中可以嵌套JSP</div>
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                                    <span class="text-muted">啸笑天</span>
<a class="tag" taget="_blank" href="/search/ext/1.htm">ext</a>
                                    <div>  
  
  
  
 当iOS 8.0和OS X v10.10发布后，一个全新的概念出现在我们眼前，那就是应用扩展。顾名思义，应用扩展允许开发者扩展应用的自定义功能和内容，能够让用户在使用其他app时使用该项功能。你可以开发一个应用扩展来执行某些特定的任务，用户使用该扩展后就可以在多个上下文环境中执行该任务。比如说，你提供了一个能让用户把内容分</div>
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                                    <span class="text-muted">macroli</span>
<a class="tag" taget="_blank" href="/search/oracle/1.htm">oracle</a><a class="tag" taget="_blank" href="/search/sql/1.htm">sql</a><a class="tag" taget="_blank" href="/search/SQL+Server/1.htm">SQL Server</a>
                                    <div> 
 表结构如下： 
 数据库id path titlesort 排序 1 0 首页 0 2 0,1 新闻 1 3 0,2 JAVA 2 4 0,3 JSP 3 5 0,2,3 业界动态 2 6 0,2,3 国内新闻 1 
 创建一个存储过程来实现，如果要在页面上使用可以设置一个返回变量将至传过去 
   
 create procedure test
as
begin
decla</div>
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                                <li><a href="/article/3485.htm"
                                       title="Css居中div，Css居中img，Css居中文本，Css垂直居中div" target="_blank">Css居中div，Css居中img，Css居中文本，Css垂直居中div</a>
                                    <span class="text-muted">qiaolevip</span>
<a class="tag" taget="_blank" href="/search/%E4%BC%97%E8%A7%82%E5%8D%83%E8%B1%A1/1.htm">众观千象</a><a class="tag" taget="_blank" href="/search/%E5%AD%A6%E4%B9%A0%E6%B0%B8%E6%97%A0%E6%AD%A2%E5%A2%83/1.htm">学习永无止境</a><a class="tag" taget="_blank" href="/search/%E6%AF%8F%E5%A4%A9%E8%BF%9B%E6%AD%A5%E4%B8%80%E7%82%B9%E7%82%B9/1.htm">每天进步一点点</a><a class="tag" taget="_blank" href="/search/css/1.htm">css</a>
                                    <div>/**********Css居中Div**********/
div.center {
  width: 100px;
  margin: 0 auto;
}
/**********Css居中img**********/
img.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
}

</div>
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                                <li><a href="/article/3612.htm"
                                       title="Oracle 常用操作(实用)" target="_blank">Oracle 常用操作(实用)</a>
                                    <span class="text-muted">吃猫的鱼</span>
<a class="tag" taget="_blank" href="/search/oracle/1.htm">oracle</a>
                                    <div> 
  SQL>select text from all_source where owner=user and name=upper('&plsql_name');
  SQL>select * from user_ind_columns where index_name=upper('&index_name');  将表记录恢复到指定时间段以前</div>
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                                <li><a href="/article/3739.htm"
                                       title="iOS中使用RSA对数据进行加密解密" target="_blank">iOS中使用RSA对数据进行加密解密</a>
                                    <span class="text-muted">witcheryne</span>
<a class="tag" taget="_blank" href="/search/ios/1.htm">ios</a><a class="tag" taget="_blank" href="/search/rsa/1.htm">rsa</a><a class="tag" taget="_blank" href="/search/iPhone/1.htm">iPhone</a><a class="tag" taget="_blank" href="/search/objective+c/1.htm">objective c</a>
                                    <div>  
RSA算法是一种非对称加密算法,常被用于加密数据传输.如果配合上数字摘要算法, 也可以用于文件签名. 
本文将讨论如何在iOS中使用RSA传输加密数据. 本文环境 
 
 mac os  
 openssl-1.0.1j, openssl需要使用1.x版本, 推荐使用[homebrew](http://brew.sh/)安装. 
 Java 8 
 RSA基本原理 
RS</div>
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