旅游网

《黑马旅游网》综合案例
1前言
为了巩固web基础知识，提升综合运用能力，故而讲解此案例。要求，每位同学能够独立完成此案例。

2项目导入
点击绿色＋按钮

选择travel项目的pom.xml文件，点击ok，完成项目导入。需要等待一小会，项目初始化完成。


3启动项目
3.1	方式一：

3.2方式二：配置maven快捷启动



4技术选型
4.1Web层
a)Servlet：前端控制器
b)html：视图
c)Filter：过滤器
d)BeanUtils：数据封装
e)Jackson：json序列化工具
4.2Service层
f)Javamail：java发送邮件工具
g)Redis：nosql内存数据库
h)Jedis：java的redis客户端
4.3Dao层
i)Mysql：数据库
j)Druid：数据库连接池
k)JdbcTemplate：jdbc的工具

5创建数据库
-- 创建数据库
CREATE DATABASE travel;
-- 使用数据库
USE travel;
--创建表
	复制提供好的sql

6注册功能
6.1页面效果

6.2功能分析

6.3代码实现
6.3.1前台代码实现
6.3.2表单校验
	提升用户体验，并减轻服务器压力。
//校验用户名
//单词字符，长度8到20位
function checkUsername() {
             //1.获取用户名值
   var username = $("#username").val();
   //2.定义正则
   var reg_username = /^\w{8,20}$/;
   
   //3.判断，给出提示信息
    var flag = reg_username.test(username);
    if(flag){
        //用户名合法
                 $("#username").css("border","");
   }else{
        //用户名非法,加一个红色边框
      $("#username").css("border","1px solid red");
   }
    
             return flag;
         }

         //校验密码
         function checkPassword() {
             //1.获取密码值
             var password = $("#password").val();
             //2.定义正则
             var reg_password = /^\w{8,20}$/;

             //3.判断，给出提示信息
             var flag = reg_password.test(password);
             if(flag){
                 //密码合法
                 $("#password").css("border","");
             }else{
                 //密码非法,加一个红色边框
                 $("#password").css("border","1px solid red");
             }

             return flag;
         }

         //校验邮箱
function checkEmail(){
    //1.获取邮箱
   var email = $("#email").val();
   //2.定义正则      [email protected]
   var reg_email = /^\w+@\w+\.\w+$/;

   //3.判断
   var flag = reg_email.test(email);
   if(flag){
                 $("#email").css("border","");
   }else{
                 $("#email").css("border","1px solid red");
   }

   return flag;
}

$(function () {
             //当表单提交时，调用所有的校验方法
   $("#registerForm").submit(function(){

                 return checkUsername() && checkPassword() && checkEmail();
                 //如果这个方法没有返回值，或者返回为true，则表单提交，如果返回为false，则表单不提交
   });

             //当某一个组件失去焦点是，调用对应的校验方法
   		$("#username").blur(checkUsername);
             $("#password").blur(checkPassword);
             $("#email").blur(checkEmail);


         });


6.3.3异步(ajax)提交表单
	在此使用异步提交表单是为了获取服务器响应的数据。因为我们前台使用的是html作为视图层，不能够直接从servlet相关的域对象获取值，只能通过ajax获取响应数据

6.3.4后台代码实现
6.3.5编写RegistUserServlet
@WebServlet("/registUserServlet")
public class RegistUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {


        //验证校验
        String check = request.getParameter("check");
        //从sesion中获取验证码
        HttpSession session = request.getSession();
        String checkcode_server = (String) session.getAttribute("CHECKCODE_SERVER");
        session.removeAttribute("CHECKCODE_SERVER");//为了保证验证码只能使用一次
        //比较
        if(checkcode_server == null || !checkcode_server.equalsIgnoreCase(check)){
            //验证码错误
            ResultInfo info = new ResultInfo();
            //注册失败
            info.setFlag(false);
            info.setErrorMsg("验证码错误");
            //将info对象序列化为json
            ObjectMapper mapper = new ObjectMapper();
            String json = mapper.writeValueAsString(info);
            response.setContentType("application/json;charset=utf-8");
            response.getWriter().write(json);
            return;
        }

        //1.获取数据
        Map<String, String[]> map = request.getParameterMap();

        //2.封装对象
        User user = new User();
        try {
            BeanUtils.populate(user,map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

        //3.调用service完成注册
        UserService service = new UserServiceImpl();
        boolean flag = service.regist(user);
        ResultInfo info = new ResultInfo();
        //4.响应结果
        if(flag){
            //注册成功
            info.setFlag(true);
        }else{
            //注册失败
            info.setFlag(false);
            info.setErrorMsg("注册失败!");
        }

        //将info对象序列化为json
        ObjectMapper mapper = new ObjectMapper();
        String json = mapper.writeValueAsString(info);

        //将json数据写回客户端
        //设置content-type
        response.setContentType("application/json;charset=utf-8");
        response.getWriter().write(json);


    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

6.3.6编写UserService以及UserServiceImpl
public class UserServiceImpl implements UserService {

    private UserDao userDao = new UserDaoImpl();
    /**
     * 注册用户
     * @param user
     * @return
     */
    @Override
    public boolean regist(User user) {
        //1.根据用户名查询用户对象
        User u = userDao.findByUsername(user.getUsername());
        //判断u是否为null
        if(u != null){
            //用户名存在，注册失败
            return false;
        }
        //2.保存用户信息
        userDao.save(user);
        return true;
    }
}


6.3.7编写UserDao以及UserDaoImpl
public class UserDaoImpl implements UserDao {

    private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());

    @Override
    public User findByUsername(String username) {
        User user = null;
        try {
            //1.定义sql
            String sql = "select * from tab_user where username = ?";
            //2.执行sql
            user = template.queryForObject(sql, new BeanPropertyRowMapper<User>(User.class), username);
        } catch (Exception e) {

        }

        return user;
    }

    @Override
    public void save(User user) {
        //1.定义sql
        String sql = "insert into tab_user(username,password,name,birthday,sex,telephone,email) values(?,?,?,?,?,?,?)";
        //2.执行sql

        template.update(sql,user.getUsername(),
                    user.getPassword(),
                user.getName(),
                user.getBirthday(),
                user.getSex(),
                user.getTelephone(),
                user.getEmail());
    }
}

6.3.8邮件激活
	为什么要进行邮件激活？为了保证用户填写的邮箱是正确的。将来可以推广一些宣传信息，到用户邮箱中。
6.3.9 发送邮件
1.申请邮箱
2.开启授权码
3.在MailUtils中设置自己的邮箱账号和密码(授权码)


邮件工具类：MailUtils，调用其中sendMail方法可以完成邮件发送


6.3.10 用户点击邮件激活
经过分析，发现，用户激活其实就是修改用户表中的status为‘Y’


分析：


发送邮件代码：


修改保存Dao代码，加上存储status和code 的代码逻辑


激活代码实现：
ActiveUserServlet
//1.获取激活码
String code = request.getParameter("code");
if(code != null){
    //2.调用service完成激活
    UserService service = new UserServiceImpl();
    boolean flag = service.active(code);

    //3.判断标记
    String msg = null;
    if(flag){
        //激活成功
        msg = "激活成功，请登录";
    }else{
        //激活失败
        msg = "激活失败，请联系管理员!";
    }
    response.setContentType("text/html;charset=utf-8");
    response.getWriter().write(msg);

UserService：active
@Override
public boolean active(String code) {
    //1.根据激活码查询用户对象
    User user = userDao.findByCode(code);
    if(user != null){
        //2.调用dao的修改激活状态的方法
        userDao.updateStatus(user);
        return true;
    }else{
        return false;
    }

}

UserDao：findByCode	updateStatus

/**
 * 根据激活码查询用户对象
 * @param code
 * @return
 */
@Override
public User findByCode(String code) {
    User user = null;
    try {
        String sql = "select * from tab_user where code = ?";

        user = template.queryForObject(sql,new BeanPropertyRowMapper<User>(User.class),code);
    } catch (DataAccessException e) {
        e.printStackTrace();
    }

    return user;
}

/**
 * 修改指定用户激活状态
 * @param user
 */
@Override
public void updateStatus(User user) {
    String sql = " update tab_user set status = 'Y' where uid=?";
    template.update(sql,user.getUid());
}




7登录
7.1分析


7.2代码实现
7.2.1前台代码

7.2.2后台代码
LoginServlet
//1.获取用户名和密码数据
Map<String, String[]> map = request.getParameterMap();
//2.封装User对象
User user = new User();
try {
    BeanUtils.populate(user,map);
} catch (IllegalAccessException e) {
    e.printStackTrace();
} catch (InvocationTargetException e) {
    e.printStackTrace();
}

//3.调用Service查询
UserService service = new UserServiceImpl();
User u  = service.login(user);

ResultInfo info = new ResultInfo();

//4.判断用户对象是否为null
if(u == null){
    //用户名密码或错误
    info.setFlag(false);
    info.setErrorMsg("用户名密码或错误");
}
//5.判断用户是否激活
if(u != null && !"Y".equals(u.getStatus())){
    //用户尚未激活
    info.setFlag(false);
    info.setErrorMsg("您尚未激活，请激活");
}
//6.判断登录成功
if(u != null && "Y".equals(u.getStatus())){
    //登录成功
    info.setFlag(true);
}

//响应数据
ObjectMapper mapper = new ObjectMapper();

response.setContentType("application/json;charset=utf-8");
mapper.writeValue(response.getOutputStream(),info);

UserService
public User login(User user) {
    return userDao.findByUsernameAndPassword(user.getUsername(),user.getPassword());
}

UserDao
public User findByUsernameAndPassword(String username, String password) {
    User user = null;
    try {
        //1.定义sql
        String sql = "select * from tab_user where username = ? and password = ?";
        //2.执行sql
        user = template.queryForObject(sql, new BeanPropertyRowMapper<User>(User.class), username,password);
    } catch (Exception e) {

    }

    return user;
}
7.2.3index页面中用户姓名的提示信息功能
效果：

header.html代码

Servlet代码
//从session中获取登录用户
Object user = request.getSession().getAttribute("user");
//将user写回客户端

ObjectMapper mapper = new ObjectMapper();
response.setContentType("application/json;charset=utf-8");
mapper.writeValue(response.getOutputStream(),user);


8退出
什么叫做登录了？session中有user对象。
实现步骤：
1.访问servlet，将session销毁
2.跳转到登录页面
代码实现：
	Header.html
Servlet:
//1.销毁session
request.getSession().invalidate();

//2.跳转登录页面
response.sendRedirect(request.getContextPath()+"/login.html");




9优化Servlet
9.1目的
减少Servlet的数量，现在是一个功能一个Servlet，将其优化为一个模块一个Servlet，相当于在数据库中一张表对应一个Servlet，在Servlet中提供不同的方法，完成用户的请求。


Idea控制台中文乱码解决：-Dfile.encoding=gb2312
	

9.2BaseServlet编写：
	public class BaseServlet extends HttpServlet {


    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //System.out.println("baseServlet的service方法被执行了...");

        //完成方法分发
        //1.获取请求路径
        String uri = req.getRequestURI(); //   /travel/user/add
        System.out.println("请求uri:"+uri);//  /travel/user/add
        //2.获取方法名称
        String methodName = uri.substring(uri.lastIndexOf('/') + 1);
        System.out.println("方法名称："+methodName);
        //3.获取方法对象Method
        //谁调用我？我代表谁
        System.out.println(this);//UserServlet的对象cn.itcast.travel.web.servlet.UserServlet@4903d97e
        try {
            //获取方法
            Method method = this.getClass().getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
            //4.执行方法
            //暴力反射
            //method.setAccessible(true);
            method.invoke(this,req,resp);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }


    }
}

9.3UserServlet改写
将之前的Servlet实现的功能，抽取到UserServlet中的不同方法中实现，并且将UserService创建抽取到成员变量位置
@WebServlet("/user/*") // /user/add /user/find
public class UserServlet extends BaseServlet {

    //声明UserService业务对象
    private UserService service = new UserServiceImpl();

    /**
     * 注册功能
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    public void regist(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        //验证校验
        String check = request.getParameter("check");
        //从sesion中获取验证码
        HttpSession session = request.getSession();
        String checkcode_server = (String) session.getAttribute("CHECKCODE_SERVER");
        session.removeAttribute("CHECKCODE_SERVER");//为了保证验证码只能使用一次
        //比较
        if(checkcode_server == null || !checkcode_server.equalsIgnoreCase(check)){
            //验证码错误
            ResultInfo info = new ResultInfo();
            //注册失败
            info.setFlag(false);
            info.setErrorMsg("验证码错误");
            //将info对象序列化为json
            ObjectMapper mapper = new ObjectMapper();
            String json = mapper.writeValueAsString(info);
            response.setContentType("application/json;charset=utf-8");
            response.getWriter().write(json);
            return;
        }

        //1.获取数据
        Map<String, String[]> map = request.getParameterMap();

        //2.封装对象
        User user = new User();
        try {
            BeanUtils.populate(user,map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

        //3.调用service完成注册
        //UserService service = new UserServiceImpl();
        boolean flag = service.regist(user);
        ResultInfo info = new ResultInfo();
        //4.响应结果
        if(flag){
            //注册成功
            info.setFlag(true);
        }else{
            //注册失败
            info.setFlag(false);
            info.setErrorMsg("注册失败!");
        }

        //将info对象序列化为json
        ObjectMapper mapper = new ObjectMapper();
        String json = mapper.writeValueAsString(info);

        //将json数据写回客户端
        //设置content-type
        response.setContentType("application/json;charset=utf-8");
        response.getWriter().write(json);

    }

    /**
     * 登录功能
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    public void login(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.获取用户名和密码数据
        Map<String, String[]> map = request.getParameterMap();
        //2.封装User对象
        User user = new User();
        try {
            BeanUtils.populate(user,map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

        //3.调用Service查询
       // UserService service = new UserServiceImpl();
        User u  = service.login(user);

        ResultInfo info = new ResultInfo();

        //4.判断用户对象是否为null
        if(u == null){
            //用户名密码或错误
            info.setFlag(false);
            info.setErrorMsg("用户名密码或错误");
        }
        //5.判断用户是否激活
        if(u != null && !"Y".equals(u.getStatus())){
            //用户尚未激活
            info.setFlag(false);
            info.setErrorMsg("您尚未激活，请激活");
        }
        //6.判断登录成功
        if(u != null && "Y".equals(u.getStatus())){
            request.getSession().setAttribute("user",u);//登录成功标记

            //登录成功
            info.setFlag(true);
        }

        //响应数据
        ObjectMapper mapper = new ObjectMapper();

        response.setContentType("application/json;charset=utf-8");
        mapper.writeValue(response.getOutputStream(),info);
    }

    /**
     * 查询单个对象
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    public void findOne(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //从session中获取登录用户
        Object user = request.getSession().getAttribute("user");
        //将user写回客户端

        ObjectMapper mapper = new ObjectMapper();
        response.setContentType("application/json;charset=utf-8");
        mapper.writeValue(response.getOutputStream(),user);
    }

    /**
     * 退出功能
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    public void exit(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.销毁session
        request.getSession().invalidate();

        //2.跳转登录页面
        response.sendRedirect(request.getContextPath()+"/login.html");
    }

    /**
     * 激活功能
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    public void active(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.获取激活码
        String code = request.getParameter("code");
        if(code != null){
            //2.调用service完成激活
            //UserService service = new UserServiceImpl();
            boolean flag = service.active(code);

            //3.判断标记
            String msg = null;
            if(flag){
                //激活成功
                msg = "激活成功，请登录";
            }else{
                //激活失败
                msg = "激活失败，请联系管理员!";
            }
            response.setContentType("text/html;charset=utf-8");
            response.getWriter().write(msg);
        }
    }
}

9.4页面路径改写
register.html

login.html

header.html

UserServiceImpl发送邮件


	

10分类数据展示
10.1效果：
	
10.2	分析：
	
10.3代码实现：
10.3.1后台代码
CategoryServlet
@WebServlet("/category/*")
public class CategoryServlet extends BaseServlet {

    private CategoryService service = new CategoryServiceImpl();

    /**
     * 查询所有
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    public void findAll(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.调用service查询所有
        List<Category> cs = service.findAll();
        //2.序列化json返回
       /* ObjectMapper mapper = new ObjectMapper();
        response.setContentType("application/json;charset=utf-8");
        mapper.writeValue(response.getOutputStream(),cs);*/
       writeValue(cs,response);

    }

}

CategoryService
public class CategoryServiceImpl implements CategoryService {

    private CategoryDao categoryDao = new CategoryDaoImpl();

    @Override
    public List<Category> findAll() {
        return categoryDao.findAll();
    }
}

CategoryDao
public class CategoryDaoImpl implements CategoryDao {

    private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());

    @Override
    public List<Category> findAll() {
        String sql = "select * from tab_category ";
        return template.query(sql,new BeanPropertyRowMapper<Category>(Category.class));
    }
}

在BaseServlet中封装了序列化json的方法

/**
 * 直接将传入的对象序列化为json，并且写回客户端
 * @param obj
 */
public void writeValue(Object obj,HttpServletResponse response) throws IOException {
    ObjectMapper mapper = new ObjectMapper();
    response.setContentType("application/json;charset=utf-8");
    mapper.writeValue(response.getOutputStream(),obj);
}

/**
 * 将传入的对象序列化为json，返回
 * @param obj
 * @return
 */
public String writeValueAsString(Object obj) throws JsonProcessingException {
    ObjectMapper mapper = new ObjectMapper();
    return mapper.writeValueAsString(obj);
}

10.3.2前台代码
hader.html加载后，发送ajax请求，请求category/findAll
//查询分类数据
 $.get("category/findAll",{},function (data) {
     //[{cid:1,cname:国内游},{},{}]
     var lis = '
首页
';
     //遍历数组,拼接字符串(
)
     for (var i = 0; i < data.length; i++) {
         var li = '
'+data[i].cname+'
';

         lis += li;
         
     }
     //拼接收藏排行榜的li,
收藏排行榜
     
     lis+= '
收藏排行榜
';

     //将lis字符串，设置到ul的html内容中
     $("#category").html(lis);
 });

10.4对分类数据进行缓存优化
分析发现，分类的数据在每一次页面加载后都会重新请求数据库来加载，对数据库的压力比较大，而且分类的数据不会经常产生变化，所有可以使用redis来缓存这个数据。
分析：

10.5优化代码实现
期望数据中存储的顺序就是将来展示的顺序，使用redis的sortedset
@Override
public List<Category> findAll() {
    //1.从redis中查询
    //1.1获取jedis客户端
    Jedis jedis = JedisUtil.getJedis();
    //1.2可使用sortedset排序查询
    Set<String> categorys = jedis.zrange("category", 0, -1);
    List<Category> cs = null;
    //2.判断查询的集合是否为空
    if (categorys == null || categorys.size() == 0) {

        System.out.println("从数据库查询....");
        //3.如果为空,需要从数据库查询,在将数据存入redis
        //3.1 从数据库查询
        cs = categoryDao.findAll();
        //3.2 将集合数据存储到redis中的 category的key
        for (int i = 0; i < cs.size(); i++) {

            jedis.zadd("category", cs.get(i).getCid(), cs.get(i).getCname());
        }
    } else {
        System.out.println("从redis中查询.....");

        //4.如果不为空,将set的数据存入list
        cs = new ArrayList<Category>();
        for (String name : categorys) {
            Category category = new Category();
            category.setCname(name);
            cs.add(category);

        }
    }


    return cs;
}


11旅游线路的分页展示
点击了不同的分类后，将来看到的旅游线路不一样的。通过分析数据库表结构，发现，旅游线路表和分类表时一个多对一的关系

查询不同分类的旅游线路sql
Select * from tab_route where cid = ?;
11.1类别id的传递
Redis中查询score（cid）
public class CategoryServiceImpl implements CategoryService {

    private CategoryDao categoryDao = new CategoryDaoImpl();

    @Override
    public List<Category> findAll() {
        //1.从redis中查询
        //1.1获取jedis客户端
        Jedis jedis = JedisUtil.getJedis();
        //1.2可使用sortedset排序查询
        //Set categorys = jedis.zrange("category", 0, -1);
        //1.3查询sortedset中的分数(cid)和值(cname)
        Set<Tuple> categorys = jedis.zrangeWithScores("category", 0, -1);

        List<Category> cs = null;
        //2.判断查询的集合是否为空
        if (categorys == null || categorys.size() == 0) {

            System.out.println("从数据库查询....");
            //3.如果为空,需要从数据库查询,在将数据存入redis
            //3.1 从数据库查询
            cs = categoryDao.findAll();
            //3.2 将集合数据存储到redis中的 category的key
            for (int i = 0; i < cs.size(); i++) {

                jedis.zadd("category", cs.get(i).getCid(), cs.get(i).getCname());
            }
        } else {
            System.out.println("从redis中查询.....");

            //4.如果不为空,将set的数据存入list
            cs = new ArrayList<Category>();
            for (Tuple tuple : categorys) {
                Category category = new Category();
                category.setCname(tuple.getElement());
                category.setCid((int)tuple.getScore());
                cs.add(category);

            }
        }


        return cs;
    }
}

页面传递cid
header.html传递cid
var li = '
+data[i].cid+'">'+data[i].cname+'
';

获取cid

$(function () {
   var search = location.search;
   //alert(search);//?id=5
    // 切割字符串，拿到第二个值
    var cid = search.split("=")[1];
});

11.2根据id查询不同类别的旅游线路数据
分页展示旅游线路数据：
11.2.1 分析


11.2.2编码
1.客户端代码编写

$(function () {
    var search = location.search;
        // 切割字符串，拿到第二个值
    var cid = search.split("=")[1];

    //当页码加载完成后，调用load方法，发送ajax请求加载数据
    load(cid);
});

function load(cid ,currentPage){
    //发送ajax请求，请求route/pageQuery,传递cid
    $.get("route/pageQuery",{cid:cid,currentPage:currentPage},function (pb) {
        //解析pagebean数据，展示到页面上

        //1.分页工具条数据展示
        //1.1 展示总页码和总记录数
        $("#totalPage").html(pb.totalPage);
        $("#totalCount").html(pb.totalCount);

                var lis = "";

        var fristPage = '
+cid+')">首页
';

        //计算上一页的页码
        var beforeNum =  pb.currentPage - 1;
        if(beforeNum <= 0){
            beforeNum = 1;
        }

        var beforePage = '
+cid+','+beforeNum+')" class="threeword">上一页
';

        lis += fristPage;
        lis += beforePage;
        //1.2 展示分页页码
        /*
            1.一共展示10个页码，能够达到前5后4的效果
            2.如果前边不够5个，后边补齐10个
            3.如果后边不足4个，前边补齐10个
        */

        // 定义开始位置begin,结束位置 end
        var begin; // 开始位置
        var end ; //  结束位置


        //1.要显示10个页码
        if(pb.totalPage < 10){
            //总页码不够10页

            begin = 1;
            end = pb.totalPage;
        }else{
            //总页码超过10页

            begin = pb.currentPage - 5 ;
            end = pb.currentPage + 4 ;

            //2.如果前边不够5个，后边补齐10个
            if(begin < 1){
                begin = 1;
                end = begin + 9;
            }

            //3.如果后边不足4个，前边补齐10个
            if(end > pb.totalPage){
                end = pb.totalPage;
                begin = end - 9 ;
            }
        }


        for (var i = begin; i <= end ; i++) {
            var li;
            //判断当前页码是否等于i
            if(pb.currentPage == i){

                li = '
+cid+','+i+')">'+i+'
';

            }else{
                //创建页码的li
                li = '
+cid+','+i+')">'+i+'
';
            }
            //拼接字符串
            lis += li;
        }





             var lastPage = '
末页
';
        var nextPage = '
下一页
';

        lis += nextPage;
        lis += lastPage;


        //将lis内容设置到 ul
        $("#pageNum").html(lis);



        
        //2.列表数据展示
        var route_lis = "";

        for (var i = 0; i < pb.list.length; i++) {
            //获取{rid:1,rname:"xxx"}
            var route = pb.list[i];

            var li = '
\n' +
                '                        
+route.rimage+'" style="width: 299px;">
\n' +
                '                        
\n' +
                '                            
'+route.rname+'
\n' +
                '                            
\n' +
                '                            
'+route.routeIntroduce+'
\n' +
                '                        
\n' +
                '                        
\n' +
                '                            
\n' +
                '                                ¥\n' +
                '                                '+route.price+'\n' +
                '                                起\n' +
                '                            
\n' +
                '                            
查看详情
\n' +
                '                        
\n' +
                '                    
';
            route_lis += li;
        }
        $("#route").html(route_lis);

        //定位到页面顶部
        window.scrollTo(0,0);
    });

}


2.服务器端代码编写
a)创建PageBean对象
public class PageBean<T> {

    private int totalCount;//总记录数
    private int totalPage;//总页数
    private int currentPage;//当前页码
    private int pageSize;//每页显示的条数

    private List<T> list;//每页显示的数据集合

    public int getTotalCount() {
        return totalCount;
    }

    public void setTotalCount(int totalCount) {
        this.totalCount = totalCount;
    }

    public int getTotalPage() {
        return totalPage;
    }

    public void setTotalPage(int totalPage) {
        this.totalPage = totalPage;
    }

    public int getCurrentPage() {
        return currentPage;
    }

    public void setCurrentPage(int currentPage) {
        this.currentPage = currentPage;
    }

    public int getPageSize() {
        return pageSize;
    }

    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    public List<T> getList() {
        return list;
    }

    public void setList(List<T> list) {
        this.list = list;
    }
}
b)RouteServlet
@WebServlet("/route/*")
public class RouteServlet extends BaseServlet {

    private RouteService routeService = new RouteServiceImpl();

    /**
     * 分页查询
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    public void pageQuery(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.接受参数
        String currentPageStr = request.getParameter("currentPage");
        String pageSizeStr = request.getParameter("pageSize");
        String cidStr = request.getParameter("cid");

        int cid = 0;//类别id
        //2.处理参数
        if(cidStr != null && cidStr.length() > 0){
            cid = Integer.parseInt(cidStr);
        }
        int currentPage = 0;//当前页码，如果不传递，则默认为第一页
        if(currentPageStr != null && currentPageStr.length() > 0){
            currentPage = Integer.parseInt(currentPageStr);
        }else{
            currentPage = 1;
        }

        int pageSize = 0;//每页显示条数，如果不传递，默认每页显示5条记录
        if(pageSizeStr != null && pageSizeStr.length() > 0){
            pageSize = Integer.parseInt(pageSizeStr);
        }else{
            pageSize = 5;
        }

        //3. 调用service查询PageBean对象
        PageBean<Route> pb = routeService.pageQuery(cid, currentPage, pageSize);

        //4. 将pageBean对象序列化为json，返回
        writeValue(pb,response);

    }

}

c)RouteService
public class RouteServiceImpl implements RouteService {
    private RouteDao routeDao = new RouteDaoImpl();
    @Override
    public PageBean<Route> pageQuery(int cid, int currentPage, int pageSize) {
        //封装PageBean
        PageBean<Route> pb = new PageBean<Route>();
        //设置当前页码
        pb.setCurrentPage(currentPage);
        //设置每页显示条数
        pb.setPageSize(pageSize);
        
        //设置总记录数
        int totalCount = routeDao.findTotalCount(cid);
        pb.setTotalCount(totalCount);
        //设置当前页显示的数据集合
        int start = (currentPage - 1) * pageSize;//开始的记录数
        List<Route> list = routeDao.findByPage(cid,start,pageSize);
        pb.setList(list);

        //设置总页数 = 总记录数/每页显示条数
        int totalPage = totalCount % pageSize == 0 ? totalCount / pageSize :(totalCount / pageSize) + 1 ;
        pb.setTotalPage(totalPage);


        return pb;
    }
}

d)RouteDao
public class RouteDaoImpl implements RouteDao {
    private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());

    @Override
    public int findTotalCount(int cid) {
        String sql = "select count(*) from tab_route where cid = ?";
        return template.queryForObject(sql,Integer.class,cid);
    }

    @Override
    public List<Route> findByPage(int cid, int start, int pageSize) {
        String sql = "select * from tab_route where cid = ? limit ? , ?";

        return template.query(sql,new BeanPropertyRowMapper<Route>(Route.class),cid,start,pageSize);
    }
}


12旅游线路名称查询

12.1查询参数的传递
在header.html中
$("#search-button").click(function () {
    //线路名称
    var rname = $("#search_input").val();

    var cid = getParameter("cid");
    // 跳转路径 http://localhost/travel/route_list.html?cid=5，拼接上rname=xxx
    location.href="http://localhost/travel/route_list.html?cid="+cid+"&rname="+rname;
});
在route_list.html
var cid = getParameter("cid");
 //获取rname的参数值
 var rname = getParameter("rname");
 //判断rname如果不为null或者""
 if(rname){
     //url解码
     rname = window.decodeURIComponent(rname);
 }
12.2修改后台代码
	Servlet
@WebServlet("/route/*")
public class RouteServlet extends BaseServlet {

    private RouteService routeService = new RouteServiceImpl();

    /**
     * 分页查询
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    public void pageQuery(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.接受参数
        String currentPageStr = request.getParameter("currentPage");
        String pageSizeStr = request.getParameter("pageSize");
        String cidStr = request.getParameter("cid");

        //接受rname 线路名称
        String rname = request.getParameter("rname");
        rname = new String(rname.getBytes("iso-8859-1"),"utf-8");


        int cid = 0;//类别id
        //2.处理参数
        if(cidStr != null && cidStr.length() > 0){
            cid = Integer.parseInt(cidStr);
        }
        int currentPage = 0;//当前页码，如果不传递，则默认为第一页
        if(currentPageStr != null && currentPageStr.length() > 0){
            currentPage = Integer.parseInt(currentPageStr);
        }else{
            currentPage = 1;
        }

        int pageSize = 0;//每页显示条数，如果不传递，默认每页显示5条记录
        if(pageSizeStr != null && pageSizeStr.length() > 0){
            pageSize = Integer.parseInt(pageSizeStr);
        }else{
            pageSize = 5;
        }

        //3. 调用service查询PageBean对象
        PageBean<Route> pb = routeService.pageQuery(cid, currentPage, pageSize,rname);

        //4. 将pageBean对象序列化为json，返回
        writeValue(pb,response);

    }

}

Service
public PageBean<Route> pageQuery(int cid, int currentPage, int pageSize,String rname ) {
    //封装PageBean
    PageBean<Route> pb = new PageBean<Route>();
    //设置当前页码
    pb.setCurrentPage(currentPage);
    //设置每页显示条数
    pb.setPageSize(pageSize);
    
    //设置总记录数
    int totalCount = routeDao.findTotalCount(cid,rname);
    pb.setTotalCount(totalCount);
    //设置当前页显示的数据集合
    int start = (currentPage - 1) * pageSize;//开始的记录数
    List<Route> list = routeDao.findByPage(cid,start,pageSize,rname);
    pb.setList(list);

    //设置总页数 = 总记录数/每页显示条数
    int totalPage = totalCount % pageSize == 0 ? totalCount / pageSize :(totalCount / pageSize) + 1 ;
    pb.setTotalPage(totalPage);


    return pb;
}

Dao

@Override
public int findTotalCount(int cid,String rname) {
    //String sql = "select count(*) from tab_route where cid = ?";
    //1.定义sql模板
    String sql = "select count(*) from tab_route where 1=1 ";
    StringBuilder sb = new StringBuilder(sql);

    List params = new ArrayList();//条件们
    //2.判断参数是否有值
    if(cid != 0){
        sb.append( " and cid = ? ");

        params.add(cid);//添加？对应的值
    }

    if(rname != null && rname.length() > 0){
        sb.append(" and rname like ? ");

        params.add("%"+rname+"%");
    }

    sql = sb.toString();


    return template.queryForObject(sql,Integer.class,params.toArray());
}

@Override
public List<Route> findByPage(int cid, int start, int pageSize,String rname) {
    //String sql = "select * from tab_route where cid = ? and rname like ?  limit ? , ?";
    String sql = " select * from tab_route where 1 = 1 ";
    //1.定义sql模板
    StringBuilder sb = new StringBuilder(sql);

    List params = new ArrayList();//条件们
    //2.判断参数是否有值
    if(cid != 0){
        sb.append( " and cid = ? ");

        params.add(cid);//添加？对应的值
    }

    if(rname != null && rname.length() > 0){
        sb.append(" and rname like ? ");

        params.add("%"+rname+"%");
    }
    sb.append(" limit ? , ? ");//分页条件

    sql = sb.toString();

    params.add(start);
    params.add(pageSize);


    return template.query(sql,new BeanPropertyRowMapper<Route>(Route.class),params.toArray());
}

12.3修改前台代码

$(function () {
   /* var search = location.search;
    //alert(search);//?id=5
    // 切割字符串，拿到第二个值
    var cid = search.split("=")[1];*/
   //获取cid的参数值
   var cid = getParameter("cid");
    //获取rname的参数值
    var rname = getParameter("rname");
    //判断rname如果不为null或者""
    if(rname){
        //url解码
        rname = window.decodeURIComponent(rname);
    }

    //当页码加载完成后，调用load方法，发送ajax请求加载数据
    load(cid,null,rname);
});

function load(cid ,currentPage,rname){
    //发送ajax请求，请求route/pageQuery,传递cid
    $.get("route/pageQuery",{cid:cid,currentPage:currentPage,rname:rname},function (pb) {
        //解析pagebean数据，展示到页面上

        //1.分页工具条数据展示
        //1.1 展示总页码和总记录数
        $("#totalPage").html(pb.totalPage);
        $("#totalCount").html(pb.totalCount);

        /*
                
首页
                
上一页
                
1
                
2
                
3
                
4
                
5
                
6
                
7
                
8
                
9
                
10
                
下一页
                
末页


         */
        var lis = "";

        var fristPage = '
+cid+',1,\''+rname+'\')">首页
';

        //计算上一页的页码
        var beforeNum =  pb.currentPage - 1;
        if(beforeNum <= 0){
            beforeNum = 1;
        }

        var beforePage = '
+cid+','+beforeNum+',\''+rname+'\')" class="threeword">上一页
';

        lis += fristPage;
        lis += beforePage;
        //1.2 展示分页页码
        /*
            1.一共展示10个页码，能够达到前5后4的效果
            2.如果前边不够5个，后边补齐10个
            3.如果后边不足4个，前边补齐10个
        */

        // 定义开始位置begin,结束位置 end
        var begin; // 开始位置
        var end ; //  结束位置


        //1.要显示10个页码
        if(pb.totalPage < 10){
            //总页码不够10页

            begin = 1;
            end = pb.totalPage;
        }else{
            //总页码超过10页

            begin = pb.currentPage - 5 ;
            end = pb.currentPage + 4 ;

            //2.如果前边不够5个，后边补齐10个
            if(begin < 1){
                begin = 1;
                end = begin + 9;
            }

            //3.如果后边不足4个，前边补齐10个
            if(end > pb.totalPage){
                end = pb.totalPage;
                begin = end - 9 ;
            }
        }


        for (var i = begin; i <= end ; i++) {
            var li;
            //判断当前页码是否等于i
            if(pb.currentPage == i){

                li = '
+cid+','+i+',\''+rname+'\')">'+i+'
';

            }else{
                //创建页码的li
                li = '
+cid+','+i+',\''+rname+'\')">'+i+'
';
            }
            //拼接字符串
            lis += li;
        }





       /* for (var i = 1; i <= pb.totalPage ; i++) {
            var li;
            //判断当前页码是否等于i
            if(pb.currentPage == i){

                li = '
'+i+'
';

            }else{
                //创建页码的li
                li = '
'+i+'
';
            }
            //拼接字符串
            lis += li;
        }*/
        var lastPage = '
末页
';
        var nextPage = '
下一页
';

        lis += nextPage;
        lis += lastPage;


        //将lis内容设置到 ul
        $("#pageNum").html(lis);



        /*
            

                

                

                    
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1-2月出发，网付立享￥1099/2人起！爆款位置有限，抢完即止！
                
                

                    

                        ¥
                        299
                        起
                    
                    
查看详情
                
            

         */

        //2.列表数据展示
        var route_lis = "";

        for (var i = 0; i < pb.list.length; i++) {
            //获取{rid:1,rname:"xxx"}
            var route = pb.list[i];

            var li = '
\n' +
                '                        
+route.rimage+'" style="width: 299px;">
\n' +
                '                        
\n' +
                '                            
'+route.rname+'
\n' +
                '                            
\n' +
                '                            
'+route.routeIntroduce+'
\n' +
                '                        
\n' +
                '                        
\n' +
                '                            
\n' +
                '                                ¥\n' +
                '                                '+route.price+'\n' +
                '                                起\n' +
                '                            
\n' +
                '                            
查看详情
\n' +
                '                        
\n' +
                '                    
';
            route_lis += li;
        }
        $("#route").html(route_lis);

        //定位到页面顶部
        window.scrollTo(0,0);
    });

}


13旅游线路的详情展示
13.1分析




13.2代码实现
13.2.1后台代码
Servlet
/**
 * 根据id查询一个旅游线路的详细信息
 * @param request
 * @param response
 * @throws ServletException
 * @throws IOException
 */
public void findOne(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    //1.接收id
    String rid = request.getParameter("rid");
    //2.调用service查询route对象
    Route route = routeService.findOne(rid);
    //3.转为json写回客户端
    writeValue(route,response);
}

Service

@Override
public Route findOne(String rid) {
    //1.根据id去route表中查询route对象
    Route route = routeDao.findOne(Integer.parseInt(rid));

    //2.根据route的id 查询图片集合信息
    List<RouteImg> routeImgList = routeImgDao.findByRid(route.getRid());
    //2.2将集合设置到route对象
    route.setRouteImgList(routeImgList);
    //3.根据route的sid（商家id）查询商家对象
    Seller seller = sellerDao.findById(route.getSid());
    route.setSeller(seller);

    return route;
}


SellerDao

public class SellerDaoImpl implements SellerDao {

    private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());



    @Override
    public Seller findById(int id) {

        String sql = "select * from tab_seller where sid = ? ";
        return template.queryForObject(sql,new BeanPropertyRowMapper<Seller>(Seller.class),id);
    }
}
routeDao
@Override
public Route findOne(int rid) {
    String sql = "select * from tab_route where rid = ?";
    return template.queryForObject(sql,new BeanPropertyRowMapper<Route>(Route.class),rid);
}
RouteImgDao

public class RouteImgDaoImpl implements RouteImgDao {

    private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());


    @Override
    public List<RouteImg> findByRid(int rid) {
        String sql = "select * from tab_route_img where rid = ? ";
        return template.query(sql,new BeanPropertyRowMapper<RouteImg>(RouteImg.class),rid);
    }
}


13.2.2前台代码
Route_detail.html中加载后
1.获取rid
2.发送ajax请求，获取route对象
3.解析对象的数据
//1.获取rid
var rid = getParameter("rid");

//2.发送请求请求 route/findOne
 $.get("route/findOne",{rid:rid},function (route) {
     //3.解析数据填充html
     $("#rname").html(route.rname);
     $("#routeIntroduce").html(route.routeIntroduce);
     $("#price").html("¥"+route.price);
     $("#sname").html(route.seller.sname);
     $("#consphone").html(route.seller.consphone);
     $("#address").html(route.seller.address);

     //图片展示

     var ddstr = '';

     //遍历routeImgList
     for (var i = 0; i < route.routeImgList.length; i++) {
         var astr ;
         if(i >= 4){
             astr = '+route.routeImgList[i].bigPic+'" style="display:none;">\n' +
                 '                        +route.routeImgList[i].smallPic+'">\n' +
                 '                    ';
         }else{
             astr = '+route.routeImgList[i].bigPic+'">\n' +
                 '                        +route.routeImgList[i].smallPic+'">\n' +
                 '                    ';
         }


         ddstr += astr;
     }
     ddstr+='';

     $("#dd").html(ddstr);

     //图片展示和切换代码调用
     goImg();
 });

14旅游线路收藏功能
14.1分析
14.1.1 判断当前登录用户是否收藏过该线路
当页面加载完成后，发送ajax请求，获取用户是否收藏的标记
根据标记，展示不同的按钮样式





14.2编写代码
14.2.1 后台代码
RouteServlet：

public void isFavorite(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    //1. 获取线路id
    String rid = request.getParameter("rid");

    //2. 获取当前登录的用户 user
    User user = (User) request.getSession().getAttribute("user");
    int uid;//用户id
    if(user == null){
        //用户尚未登录
        uid = 0;
    }else{
        //用户已经登录
        uid = user.getUid();
    }

    //3. 调用FavoriteService查询是否收藏
    boolean flag = favoriteService.isFavorite(rid, uid);

    //4. 写回客户端
    writeValue(flag,response);
}

FavoriteService

@Override
public boolean isFavorite(String rid, int uid) {

    Favorite favorite = favoriteDao.findByRidAndUid(Integer.parseInt(rid), uid);

    return favorite != null;//如果对象有值，则为true，反之，则为false
}


FavoriteDao
@Override
public Favorite findByRidAndUid(int rid, int uid) {
    Favorite favorite = null;
    try {
        String sql = " select * from tab_favorite where rid = ? and uid = ?";
        favorite = template.queryForObject(sql, new BeanPropertyRowMapper<Favorite>(Favorite.class), rid, uid);
    } catch (DataAccessException e) {
        e.printStackTrace();
    }
    return favorite;
}

14.2.2 前台代码
route_detail.html

$(function () {
   // 发送请求，判断用户是否收藏过该线路
    var rid = getParameter("rid");
    $.get("route/isFavorite",{rid:rid},function (flag) {
        if(flag){
            // 用户已经收藏过
            //
            //设置收藏按钮的样式
            $("#favorite").addClass("already");
            $("#favorite").prop("disabled",disabled);



        }else{
            // 用户没有收藏
        }
    });

14.3收藏次数的动态展示
前台：
//设置收藏次数
$("#favoriteCount").html("已收藏"+route.count+"次");

后台：
	RouteService
//4. 查询收藏次数
int count = favoriteDao.findCountByRid(route.getRid());
route.setCount(count);

FavoriteDao
@Override
public int findCountByRid(int rid) {
    String sql = "SELECT COUNT(*) FROM tab_favorite WHERE rid = ?";

    return template.queryForObject(sql,Integer.class,rid);
}


14.4点击按钮收藏线路
14.4.1 分析：
		
14.4.2 编码
前台代码
	$(function () {
   // 发送请求，判断用户是否收藏过该线路
    var rid = getParameter("rid");
    $.get("route/isFavorite",{rid:rid},function (flag) {
        if(flag){
            // 用户已经收藏过
            //
            //设置收藏按钮的样式
            $("#favorite").addClass("already");
            $("#favorite").attr("disabled","disabled");

            //删除按钮的点击事件
            $("#favorite").removeAttr("onclick");
        }else{
            // 用户没有收藏
        }
    });



});

//点击收藏按钮触发的方法
function addFavorite(){
    var rid = getParameter("rid");
    //1. 判断用户是否登录
    $.get("user/findOne",{},function (user) {
       if(user){
           //用户登录了
            //添加功能
            $.get("route/addFavorite",{rid:rid},function () {

                //代码刷新页面
                location.reload();
            });

       }else{
           //用户没有登录
           alert("您尚未登录，请登录");
           location.href="http://localhost/travel/login.html";
       }
    })
}

后台代码
RouteServlet
public void addFavorite(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    //1. 获取线路rid
    String rid = request.getParameter("rid");
    //2. 获取当前登录的用户
    User user = (User) request.getSession().getAttribute("user");
    int uid;//用户id
    if(user == null){
        //用户尚未登录
        return ;
    }else{
        //用户已经登录
        uid = user.getUid();
    }


    //3. 调用service添加
    favoriteService.add(rid,uid);

}

FavoriteService
@Override
public void add(String rid, int uid) {
    favoriteDao.add(Integer.parseInt(rid),uid);
}

FavoriteDao
@Override
public void add(int rid, int uid) {
    String sql = "insert into tab_favorite values(?,?,?)";

    template.update(sql,rid,new Date(),uid);
}