EXTINF |
#EXTINF:,[]</code></td>
<td>表示其后 URL 指定的媒体片段时长（单位为秒），<code>duration</code>可以为十进制的整型或者浮点型，其值必须小于或等于<code>EXT-X-TARGETDURATION</code>指定的值</td>
</tr>
<tr>
<td><code>EXT-X-ENDLIST</code></td>
<td><code>#EXT-X-ENDLIST</code></td>
<td>表明m3u8文件的结束</td>
</tr>
</tbody>
</table>
<blockquote>
<p> 简书：m3u8 文件格式详解 作者：Whyn</p>
</blockquote>
<h2>2. 第三方库----m3u8</h2>
<blockquote>
<p> <code>m3u8</code>是一个专门用于解析m3u8文件的解析器，有关库的详细操作请参阅官方示例</p>
</blockquote>
<pre><code class="prism language-bash"> <span class="token comment"># 安装m3u8</span>
pip <span class="token function">install</span> m3u8
</code></pre>
<pre><code class="prism language-bash"> <span class="token comment"># 加载m3u8文件</span>
<span class="token function">import</span> m3u8
<span class="token comment"># 返回一个M3U8对象</span>
playlist <span class="token operator">=</span> m3u8.load<span class="token punctuation">(</span>uri<span class="token operator">=</span><span class="token string">'http://videoserver.com/playlist.m3u8'</span><span class="token punctuation">)</span> <span class="token comment"># url</span>
<span class="token comment"># playlist = m3u8.load(uri='playlist.m3u8') # file</span>
print<span class="token punctuation">(</span>playlist.segments<span class="token punctuation">)</span> <span class="token comment"># 打印EXT-X-KEY标签和所有的EXTINF标签:</span>
print<span class="token punctuation">(</span>playlist.target_duration<span class="token punctuation">)</span> <span class="token comment"># 打印EXT-X-TARGETDURATION标签的值</span>
<span class="token keyword">for</span> key <span class="token keyword">in</span> playlist.keys:
<span class="token keyword">if</span> key:
<span class="token comment"># 如果视频文件加密，可以查看加密参数</span>
print<span class="token punctuation">(</span>key.uri, key.method, key.iv<span class="token punctuation">)</span>
</code></pre>
<h2>3. 合成mp4文件</h2>
<p><a href="http://img.e-com-net.com/image/info8/9e232b8828e44539ac8d8090daffcba3.jpg" target="_blank"><img src="http://img.e-com-net.com/image/info8/9e232b8828e44539ac8d8090daffcba3.jpg" alt="Python爬虫：从m3u8文件里提取小视频的正确操作_第3张图片" width="650" height="345" style="border:1px solid black;"></a><br> 本次就以这个视频为例，流程如下：<br> <code>1.</code> 找到视频对应的<code>.m3u8</code>文件<br> <code>2.</code> 解析<code>.m3u8</code>文件，从中提取<code>.ts</code>视频的url<br> <code>3.</code> 下载<code>.ts</code>格式的视频<br> <code>4.</code> 解密<code>.ts</code>格式的视频（如果视频流没有加密，则该步不是必须的）<br> <code>5.</code> 合成<code>.mp4</code>或其他格式的视频</p>
<pre><code class="prism language-bash"> <span class="token comment"># 第1步，我载了m3u8文件，也可以直接使用m3u8文件对应的url</span>
playlist <span class="token operator">=</span> m3u8.load<span class="token punctuation">(</span>uri<span class="token operator">=</span><span class="token string">'./data/index.m3u8'</span><span class="token punctuation">)</span>
<span class="token comment"># 第2步，提取URL</span>
<span class="token keyword">for</span> seg <span class="token keyword">in</span> playlist.segments:
print<span class="token punctuation">(</span>seg.uri<span class="token punctuation">)</span>
<span class="token comment"># 第3步，下载ts视频</span>
with open<span class="token punctuation">(</span><span class="token string">'xxxxx.ts'</span>, <span class="token string">'wb'</span><span class="token punctuation">)</span> as f:
ts <span class="token operator">=</span> get_ts<span class="token punctuation">(</span>url<span class="token punctuation">)</span>
f.write<span class="token punctuation">(</span>ts<span class="token punctuation">)</span>
<span class="token comment"># 第4步，解密</span>
cipher_text <span class="token operator">=</span> pad<span class="token punctuation">(</span>data_to_pad<span class="token operator">=</span>cipher_text, block_size<span class="token operator">=</span>AES.block_size<span class="token punctuation">)</span>
aes <span class="token operator">=</span> AES.new<span class="token punctuation">(</span>key<span class="token operator">=</span>key, mode<span class="token operator">=</span>AES.MODE_CBC, iv<span class="token operator">=</span>iv<span class="token punctuation">)</span>
cipher_text <span class="token operator">=</span> aes.decrypt<span class="token punctuation">(</span>cipher_text<span class="token punctuation">)</span>
<span class="token comment"># 第5步，合成</span>
files <span class="token operator">=</span> glob.glob<span class="token punctuation">(</span>os.path.join<span class="token punctuation">(</span><span class="token string">'./video'</span>, <span class="token string">'*.ts'</span><span class="token punctuation">))</span>
<span class="token keyword">for</span> <span class="token function">file</span> <span class="token keyword">in</span> files:
with open<span class="token punctuation">(</span>file, <span class="token string">'rb'</span><span class="token punctuation">)</span> as fr, open<span class="token punctuation">(</span><span class="token string">'./video_de/baitoushan.mp4'</span>, <span class="token string">'ab'</span><span class="token punctuation">)</span> as fw:
content <span class="token operator">=</span> fr.read<span class="token punctuation">(</span><span class="token punctuation">)</span>
fw.write<span class="token punctuation">(</span>content <span class="token punctuation">)</span>
</code></pre>
<h2>4. 完整代码</h2>
<pre><code class="prism language-python"><span class="token comment"># -*- coding: utf-8 -*-</span>
<span class="token comment"># @Time : 2021/5/10 20:11</span>
<span class="token comment"># @Author : XiaYouRan</span>
<span class="token comment"># @Email : youran.xia@foxmail.com</span>
<span class="token comment"># @File : video.py</span>
<span class="token comment"># @Software: PyCharm</span>
<span class="token keyword">from</span> Crypto<span class="token punctuation">.</span>Cipher <span class="token keyword">import</span> AES
<span class="token keyword">from</span> Crypto<span class="token punctuation">.</span>Util<span class="token punctuation">.</span>Padding <span class="token keyword">import</span> pad
<span class="token keyword">from</span> concurrent<span class="token punctuation">.</span>futures <span class="token keyword">import</span> ThreadPoolExecutor
<span class="token keyword">import</span> requests
<span class="token keyword">import</span> m3u8
<span class="token keyword">import</span> glob
<span class="token keyword">import</span> os
<span class="token keyword">import</span> time
<span class="token keyword">import</span> logging
logging<span class="token punctuation">.</span>getLogger<span class="token punctuation">(</span><span class="token string">"urllib3"</span><span class="token punctuation">)</span><span class="token punctuation">.</span>setLevel<span class="token punctuation">(</span>logging<span class="token punctuation">.</span>WARNING<span class="token punctuation">)</span>
<span class="token keyword">def</span> <span class="token function">AESDecrypt</span><span class="token punctuation">(</span>cipher_text<span class="token punctuation">,</span> key<span class="token punctuation">,</span> iv<span class="token punctuation">)</span><span class="token punctuation">:</span>
cipher_text <span class="token operator">=</span> pad<span class="token punctuation">(</span>data_to_pad<span class="token operator">=</span>cipher_text<span class="token punctuation">,</span> block_size<span class="token operator">=</span>AES<span class="token punctuation">.</span>block_size<span class="token punctuation">)</span>
aes <span class="token operator">=</span> AES<span class="token punctuation">.</span>new<span class="token punctuation">(</span>key<span class="token operator">=</span>key<span class="token punctuation">,</span> mode<span class="token operator">=</span>AES<span class="token punctuation">.</span>MODE_CBC<span class="token punctuation">,</span> iv<span class="token operator">=</span>iv<span class="token punctuation">)</span>
cipher_text <span class="token operator">=</span> aes<span class="token punctuation">.</span>decrypt<span class="token punctuation">(</span>cipher_text<span class="token punctuation">)</span>
<span class="token comment"># clear_text = unpad(padded_data=cipher_text, block_size=AES.block_size)</span>
<span class="token keyword">return</span> cipher_text
headers <span class="token operator">=</span> <span class="token punctuation">{
</span><span class="token string">'User-Agent'</span><span class="token punctuation">:</span> <span class="token string">'Mozilla/5.0 (Windows NT 10.0; Win64; x64) '</span>
<span class="token string">'AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36'</span><span class="token punctuation">}</span>
<span class="token keyword">def</span> <span class="token function">get_ts</span><span class="token punctuation">(</span>url<span class="token punctuation">)</span><span class="token punctuation">:</span>
<span class="token keyword">try</span><span class="token punctuation">:</span>
response <span class="token operator">=</span> requests<span class="token punctuation">.</span>get<span class="token punctuation">(</span>url<span class="token punctuation">,</span> verify<span class="token operator">=</span><span class="token boolean">False</span><span class="token punctuation">)</span>
response<span class="token punctuation">.</span>raise_for_status<span class="token punctuation">(</span><span class="token punctuation">)</span>
response<span class="token punctuation">.</span>encoding <span class="token operator">=</span> <span class="token string">'utf-8'</span>
<span class="token keyword">return</span> response<span class="token punctuation">.</span>content
<span class="token keyword">except</span> Exception <span class="token keyword">as</span> err<span class="token punctuation">:</span>
<span class="token keyword">print</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span>
<span class="token keyword">return</span> b<span class="token string">''</span>
<span class="token keyword">def</span> <span class="token function">save_ts</span><span class="token punctuation">(</span>url<span class="token punctuation">,</span> index<span class="token punctuation">)</span><span class="token punctuation">:</span>
filename <span class="token operator">=</span> os<span class="token punctuation">.</span>path<span class="token punctuation">.</span>join<span class="token punctuation">(</span><span class="token string">'./video'</span><span class="token punctuation">,</span> <span class="token builtin">str</span><span class="token punctuation">(</span>index<span class="token punctuation">)</span><span class="token punctuation">.</span>zfill<span class="token punctuation">(</span><span class="token number">5</span><span class="token punctuation">)</span> <span class="token operator">+</span> <span class="token string">'.ts'</span><span class="token punctuation">)</span>
<span class="token keyword">with</span> <span class="token builtin">open</span><span class="token punctuation">(</span>filename<span class="token punctuation">,</span> <span class="token string">'wb'</span><span class="token punctuation">)</span> <span class="token keyword">as</span> f<span class="token punctuation">:</span>
ts <span class="token operator">=</span> get_ts<span class="token punctuation">(</span>url<span class="token punctuation">)</span>
f<span class="token punctuation">.</span>write<span class="token punctuation">(</span>ts<span class="token punctuation">)</span>
<span class="token keyword">print</span><span class="token punctuation">(</span>filename <span class="token operator">+</span> <span class="token string">' is ok!'</span><span class="token punctuation">)</span>
<span class="token keyword">if</span> __name__ <span class="token operator">==</span> <span class="token string">'__main__'</span><span class="token punctuation">:</span>
playlist <span class="token operator">=</span> m3u8<span class="token punctuation">.</span>load<span class="token punctuation">(</span>uri<span class="token operator">=</span><span class="token string">'./data/index.m3u8'</span><span class="token punctuation">)</span>
<span class="token comment"># 线程池，引入index可以防止合成时视频发生乱序</span>
<span class="token keyword">with</span> ThreadPoolExecutor<span class="token punctuation">(</span>max_workers<span class="token operator">=</span><span class="token number">10</span><span class="token punctuation">)</span> <span class="token keyword">as</span> pool<span class="token punctuation">:</span>
<span class="token keyword">for</span> index<span class="token punctuation">,</span> seg <span class="token keyword">in</span> <span class="token builtin">enumerate</span><span class="token punctuation">(</span>playlist<span class="token punctuation">.</span>segments<span class="token punctuation">)</span><span class="token punctuation">:</span>
pool<span class="token punctuation">.</span>submit<span class="token punctuation">(</span>save_ts<span class="token punctuation">,</span> seg<span class="token punctuation">.</span>uri<span class="token punctuation">,</span> index<span class="token punctuation">)</span>
key <span class="token operator">=</span> get_ts<span class="token punctuation">(</span>playlist<span class="token punctuation">.</span>keys<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>uri<span class="token punctuation">)</span>
files <span class="token operator">=</span> glob<span class="token punctuation">.</span>glob<span class="token punctuation">(</span>os<span class="token punctuation">.</span>path<span class="token punctuation">.</span>join<span class="token punctuation">(</span><span class="token string">'./video'</span><span class="token punctuation">,</span> <span class="token string">'*.ts'</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token keyword">for</span> <span class="token builtin">file</span> <span class="token keyword">in</span> files<span class="token punctuation">:</span>
<span class="token keyword">with</span> <span class="token builtin">open</span><span class="token punctuation">(</span><span class="token builtin">file</span><span class="token punctuation">,</span> <span class="token string">'rb'</span><span class="token punctuation">)</span> <span class="token keyword">as</span> fr<span class="token punctuation">,</span> <span class="token builtin">open</span><span class="token punctuation">(</span><span class="token string">'./video_de/baitoushan.mp4'</span><span class="token punctuation">,</span> <span class="token string">'ab'</span><span class="token punctuation">)</span> <span class="token keyword">as</span> fw<span class="token punctuation">:</span>
content <span class="token operator">=</span> fr<span class="token punctuation">.</span>read<span class="token punctuation">(</span><span class="token punctuation">)</span>
encontent <span class="token operator">=</span> AESDecrypt<span class="token punctuation">(</span>content<span class="token punctuation">,</span> key<span class="token operator">=</span>key<span class="token punctuation">,</span> iv<span class="token operator">=</span>key<span class="token punctuation">)</span>
fw<span class="token punctuation">.</span>write<span class="token punctuation">(</span>encontent<span class="token punctuation">)</span>
<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token builtin">file</span> <span class="token operator">+</span> <span class="token string">' is ok!'</span><span class="token punctuation">)</span>
</code></pre>
<p> 下载<code>.ts</code>文件效果如下：</p>
<p><a href="http://img.e-com-net.com/image/info8/fb2f2dc4fc5243fcb326695b80a4c58c.jpg" target="_blank"><img src="http://img.e-com-net.com/image/info8/fb2f2dc4fc5243fcb326695b80a4c58c.jpg" alt="Python爬虫：从m3u8文件里提取小视频的正确操作_第4张图片" width="650" height="389" style="border:1px solid black;"></a><br> 合成<code>.mp4</code>文件效果如下：</p>
<p><a href="http://img.e-com-net.com/image/info8/c4cfa91843e4420291b75c54c2c9e017.jpg" target="_blank"><img src="http://img.e-com-net.com/image/info8/c4cfa91843e4420291b75c54c2c9e017.jpg" alt="Python爬虫：从m3u8文件里提取小视频的正确操作_第5张图片" width="650" height="389" style="border:1px solid black;"></a></p>
<p></p>
<h2>5. 结束语</h2>
<p><font face="仿宋" size="4">Musicer开源代码仓库</font></p>
<hr>
<p> Musicer音乐爬虫已经开源了哦，持续更新中，欢迎来踩来Star哦！ヾ(≧∇≦*)ヾ<br> 如果对Python爬虫感兴趣的话，欢迎关注我的爬虫专栏，有问题及时联系哦！</p>
</div>
</div>
</div>
</div>
</div>
<!--PC和WAP自适应版-->
<div id="SOHUCS" sid="1392258267501121536"></div>
<script type="text/javascript" src="/views/front/js/chanyan.js"></script>
<!-- 文章页-底部 动态广告位 -->
<div class="youdao-fixed-ad" id="detail_ad_bottom"></div>
</div>
<div class="col-md-3">
<div class="row" id="ad">
<!-- 文章页-右侧1 动态广告位 -->
<div id="right-1" class="col-lg-12 col-md-12 col-sm-4 col-xs-4 ad">
<div class="youdao-fixed-ad" id="detail_ad_1"> </div>
</div>
<!-- 文章页-右侧2 动态广告位 -->
<div id="right-2" class="col-lg-12 col-md-12 col-sm-4 col-xs-4 ad">
<div class="youdao-fixed-ad" id="detail_ad_2"></div>
</div>
<!-- 文章页-右侧3 动态广告位 -->
<div id="right-3" class="col-lg-12 col-md-12 col-sm-4 col-xs-4 ad">
<div class="youdao-fixed-ad" id="detail_ad_3"></div>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="container">
<h4 class="pt20 mb15 mt0 border-top">你可能感兴趣的:(Python爬虫,python,爬虫,m3u8,ts合成mp4)</h4>
<div id="paradigm-article-related">
<div class="recommend-post mb30">
<ul class="widget-links">
<li><a href="/article/1891987805203132416.htm"
title="Python 函数-调用函数" target="_blank">Python 函数-调用函数</a>
<span class="text-muted">赔罪</span>
<a class="tag" taget="_blank" href="/search/Python/1.htm">Python</a><a class="tag" taget="_blank" href="/search/%E7%B3%BB%E7%BB%9F%E5%AD%A6%E4%B9%A0/1.htm">系统学习</a><a class="tag" taget="_blank" href="/search/python/1.htm">python</a><a class="tag" taget="_blank" href="/search/%E5%BC%80%E5%8F%91%E8%AF%AD%E8%A8%80/1.htm">开发语言</a>
<div>目录抽象调用函数数据类型转换练习小结我们知道圆的面积计算公式为：S=πr2当我们知道半径r的值时，就可以根据公式计算出面积。假设我们需要计算3个不同大小的圆的面积：r1=12.34r2=9.08r3=73.1s1=3.14*r1*r1s2=3.14*r2*r2s3=3.14*r3*r3当代码出现有规律的重复的时候，你就需要当心了，每次写3.14*x*x不仅很麻烦，而且，如果要把3.14改成3.14</div>
</li>
<li><a href="/article/1891987679004913664.htm"
title="Python数据容器（dict字典、set集合）" target="_blank">Python数据容器（dict字典、set集合）</a>
<span class="text-muted">张小生180</span>
<a class="tag" taget="_blank" href="/search/python/1.htm">python</a><a class="tag" taget="_blank" href="/search/%E5%BC%80%E5%8F%91%E8%AF%AD%E8%A8%80/1.htm">开发语言</a>
<div>dic字典dict全称dictionary，在其他语言中也称为map，使用键-值（key-value）存储，具有极快的查找速度。字典的创建使用大括号{}包含键值对，并用冒号:分隔键和值，形成键:值对。字典的特性唯一键：字典中的每个键都必须是唯一的。值可以取任何数据类型，如字符串，数字，元组。无序（Python3.6之前的版本）：在Python3.6之前的版本中，字典是无序的。但从Python3.7</div>
</li>
<li><a href="/article/1891985034747899904.htm"
title="自定义Agent组件" target="_blank">自定义Agent组件</a>
<span class="text-muted">三月七꧁ ꧂</span>
<a class="tag" taget="_blank" href="/search/langchain%2Bllm/1.htm">langchain+llm</a><a class="tag" taget="_blank" href="/search/python/1.htm">python</a><a class="tag" taget="_blank" href="/search/%E5%BC%80%E5%8F%91%E8%AF%AD%E8%A8%80/1.htm">开发语言</a><a class="tag" taget="_blank" href="/search/microsoft/1.htm">microsoft</a><a class="tag" taget="_blank" href="/search/gpt/1.htm">gpt</a><a class="tag" taget="_blank" href="/search/langchain/1.htm">langchain</a><a class="tag" taget="_blank" href="/search/javascript/1.htm">javascript</a><a class="tag" taget="_blank" href="/search/%E5%89%8D%E7%AB%AF/1.htm">前端</a>
<div>文章目录ReActAgent的实践工具组件和工具包组件工具组件的类型 一个Agent组件由两部分组成：tools（代理可以使用的工具)和AgentExecutor(决定采取哪种行动)。下面逐一介绍如何创建自定义Agent组件。Tool、AgentExecutor和BaseSingleActionAgent是从LangChain.agents模块中导人的类，用于创建自定义Agent组件和too</div>
</li>
<li><a href="/article/1891982886920318976.htm"
title="批量更新 AWS ECS Fargate 服务：自动化平台版本升级" target="_blank">批量更新 AWS ECS Fargate 服务：自动化平台版本升级</a>
<span class="text-muted">ivwdcwso</span>
<a class="tag" taget="_blank" href="/search/%E5%BC%80%E5%8F%91/1.htm">开发</a><a class="tag" taget="_blank" href="/search/%E8%BF%90%E7%BB%B4/1.htm">运维</a><a class="tag" taget="_blank" href="/search/aws/1.htm">aws</a><a class="tag" taget="_blank" href="/search/%E8%87%AA%E5%8A%A8%E5%8C%96/1.htm">自动化</a><a class="tag" taget="_blank" href="/search/%E4%BA%91%E8%AE%A1%E7%AE%97/1.htm">云计算</a><a class="tag" taget="_blank" href="/search/Fargate/1.htm">Fargate</a><a class="tag" taget="_blank" href="/search/ecs/1.htm">ecs</a>
<div>在使用AWSECSFargate时，我们经常会收到平台版本更新的通知。为了确保我们的服务运行在最新的平台版本上，我们需要更新所有受影响的任务。本文将介绍如何使用Python和AWSSDK(boto3)来批量更新ECSFargate服务，自动化这一过程。背景AWSFargate会定期发布新的平台版本，以提供新功能和进行例行维护。当新版本发布时，AWS会通知用户在特定日期之前更新他们的任务。虽然AWS</div>
</li>
<li><a href="/article/1891982508489240576.htm"
title="【学习笔记】Python基础-字典Dict和Set和List与Str扩展" target="_blank">【学习笔记】Python基础-字典Dict和Set和List与Str扩展</a>
<span class="text-muted">法迪</span>
<a class="tag" taget="_blank" href="/search/Python%E5%9F%BA%E7%A1%80/1.htm">Python基础</a><a class="tag" taget="_blank" href="/search/python/1.htm">python</a><a class="tag" taget="_blank" href="/search/hashmap/1.htm">hashmap</a><a class="tag" taget="_blank" href="/search/Dict/1.htm">Dict</a><a class="tag" taget="_blank" href="/search/set/1.htm">set</a><a class="tag" taget="_blank" href="/search/list/1.htm">list</a>
<div>Dict使用大括号围起来，这里提供一种键值对的list表示方法1.Dict{}2.List[]3.turple()实例代码#!/usr/bin/envpython3#-*-coding:utf-8-*-#字典dict类似Java的HashMap#Dict{}#List[]#turple()mDict={"Lava":90,"Huawei":100,"Sony":60}print(mDict['La</div>
</li>
<li><a href="/article/1891981752872792064.htm"
title="百问网imx6ullpro调试记录（linux+qt）" target="_blank">百问网imx6ullpro调试记录（linux+qt）</a>
<span class="text-muted">嵌入式修炼师</span>
<a class="tag" taget="_blank" href="/search/linux%E9%A9%B1%E5%8A%A8/1.htm">linux驱动</a><a class="tag" taget="_blank" href="/search/linux/1.htm">linux</a><a class="tag" taget="_blank" href="/search/qt/1.htm">qt</a>
<div>调试记录文章目录调试记录进展1.开发板相关1.1百问网乌班图密码1.2换设备开发环境搭建串口调试网络互通nfs文件系统挂载1.3网络问题1.4系统启动1.5进程操作2.QT2.1tslib1.获取源码2.安装依赖文件3.编译2.2qt移植1.获取qt源码2.配置编译器3.编译2.3拷贝到开发板1.拷贝2.修改开发板配置文件qttslib3.验证是否生效2.4安装QtCreator1.获取安装包2.</div>
</li>
<li><a href="/article/1891977464578633728.htm"
title="python中的dict与set" target="_blank">python中的dict与set</a>
<span class="text-muted">“光光”</span>
<a class="tag" taget="_blank" href="/search/python/1.htm">python</a>
<div>python内置字典：dict支持key-value存储方式，在放进去的时候，必须根据key算出value的存放位置，这样取出来的时候才能根据key拿到value。由于一个key只能对应一个value,所以，多次对一个key放入value,后面的值会将前面的值覆盖掉。如果key不存在，dict就会报错要避免key不存在的错误，有两种方法：1）通过in判断key是否存在>>>d=｛'a':'1'｝></div>
</li>
<li><a href="/article/1891976205599567872.htm"
title="Python基础---Dict（字典）" target="_blank">Python基础---Dict（字典）</a>
<span class="text-muted">grace666</span>
<a class="tag" taget="_blank" href="/search/Python/1.htm">Python</a>
<div>1.字典以键值对组成，包含在{}中，字典的键必须为hashable，即不可变（字符串、元组、数字），并且唯一；值可以是任何类型#dict1={[1]:1}#报错：TypeError:unhashabletype:'list'#dict1={{1}:1}#报错：TypeError:unhashabletype:'set'dict1={(1,):1}print(dict1)#{(1,):1}dict1</div>
</li>
<li><a href="/article/1891976079011278848.htm"
title="Markdown 到 PowerPoint 转换工具——md2pptx" target="_blank">Markdown 到 PowerPoint 转换工具——md2pptx</a>
<span class="text-muted">伍盛普Silas</span>
<div>Markdown到PowerPoint转换工具——md2pptxmd2pptxMarkdownToPowerPointconverter项目地址:https://gitcode.com/gh_mirrors/md/md2pptxmd2pptx是一个开源项目，它可以将Markdown格式的文本转换为PowerPoint演示文稿。该项目主要使用Python编程语言实现。项目基础介绍md2pptx是一个</div>
</li>
<li><a href="/article/1891974566327152640.htm"
title="Python网络爬虫-WebSocket数据抓取" target="_blank">Python网络爬虫-WebSocket数据抓取</a>
<span class="text-muted">程序小勇</span>
<a class="tag" taget="_blank" href="/search/faiss/1.htm">faiss</a><a class="tag" taget="_blank" href="/search/%E7%88%AC%E8%99%AB/1.htm">爬虫</a><a class="tag" taget="_blank" href="/search/python/1.htm">python</a><a class="tag" taget="_blank" href="/search/%E7%BD%91%E7%BB%9C%E5%8D%8F%E8%AE%AE/1.htm">网络协议</a><a class="tag" taget="_blank" href="/search/websocket/1.htm">websocket</a><a class="tag" taget="_blank" href="/search/%E5%BC%80%E5%8F%91%E8%AF%AD%E8%A8%80/1.htm">开发语言</a>
<div>目录前言1、WebSocket请求的分析通常涉及以下几个方面：2、利用WebSocket爬取数据总结最后，创作不易！非常感谢大家的关注、点赞、评论啦！谢谢三连哦！好人好运连连，学习进步！工作顺利哦！博主介绍：✌专注于前后端、机器学习、人工智能应用领域开发的优质创作者、秉着互联网精神开源贡献精神，答疑解惑、坚持优质作品共享。本人是掘金/腾讯云/阿里云等平台优质作者、擅长前后端项目开发和毕业项目实战，</div>
</li>
<li><a href="/article/1891972925041471488.htm"
title="Pytorch实现之在LSGAN中结合重建损失" target="_blank">Pytorch实现之在LSGAN中结合重建损失</a>
<span class="text-muted">这张生成的图像能检测吗</span>
<a class="tag" taget="_blank" href="/search/GAN%E7%B3%BB%E5%88%97/1.htm">GAN系列</a><a class="tag" taget="_blank" href="/search/%E4%BC%98%E8%B4%A8GAN%E6%A8%A1%E5%9E%8B%E8%AE%AD%E7%BB%83%E8%87%AA%E5%B7%B1%E7%9A%84%E6%95%B0%E6%8D%AE%E9%9B%86/1.htm">优质GAN模型训练自己的数据集</a><a class="tag" taget="_blank" href="/search/pytorch/1.htm">pytorch</a><a class="tag" taget="_blank" href="/search/%E4%BA%BA%E5%B7%A5%E6%99%BA%E8%83%BD/1.htm">人工智能</a><a class="tag" taget="_blank" href="/search/python/1.htm">python</a>
<div>简介简介：这篇论文在LSGAN的基础上结合了重建损失来产生通过传统不良数据检测（BDD）机制的人工测量。这篇博客的主要内容是关于实现了重建损失与LSGAN的结合。论文题目：FalseDataInjectionAttacksBasedonLeastSquaresGenerativeAdversarialNetworkswithReconstructionLoss（基于重构损失最小二乘生成对抗网络的虚</div>
</li>
<li><a href="/article/1891972165155221504.htm"
title="ubuntu安装rabbitmq" target="_blank">ubuntu安装rabbitmq</a>
<span class="text-muted">一个铲屎官</span>
<a class="tag" taget="_blank" href="/search/linux/1.htm">linux</a><a class="tag" taget="_blank" href="/search/%E5%AE%89%E8%A3%85%E6%95%99%E7%A8%8B/1.htm">安装教程</a><a class="tag" taget="_blank" href="/search/rabbitmq/1.htm">rabbitmq</a><a class="tag" taget="_blank" href="/search/ubuntu/1.htm">ubuntu</a><a class="tag" taget="_blank" href="/search/linux/1.htm">linux</a>
<div>1、安装erlang由于rabbitMq需要erlang语言的支持，在安装rabbitMq之前需要安装erlangsudoapt-getinstallerlang-nox2、安装Rabbitmq更新源sudoapt-getupdate安装sudoapt-getinstallrabbitmq-server启动、停止、重启、状态rabbitMq命令sudorabbitmq-serverstartsud</div>
</li>
<li><a href="/article/1891970024835444736.htm"
title="[生活杂项][运动教程]自由泳" target="_blank">[生活杂项][运动教程]自由泳</a>
<span class="text-muted">xcy6666</span>
<a class="tag" taget="_blank" href="/search/%E7%94%9F%E6%B4%BB/1.htm">生活</a>
<div>https://v.youku.com/v_show/id_XMzgzMjkwMzg0MA==.html?spm=a2h0k.11417342.soresults.dtitlehttps://v.youku.com/v_show/id_XMzgxNjM2NjY4NA==.html?spm=a2h0k.11417342.soresults.dtitle</div>
</li>
<li><a href="/article/1891965987805261824.htm"
title="mysql 记录客户端ip_MySQL查看所有连接的客户端ip" target="_blank">mysql 记录客户端ip_MySQL查看所有连接的客户端ip</a>
<span class="text-muted">辉萱0623</span>
<a class="tag" taget="_blank" href="/search/mysql/1.htm">mysql</a><a class="tag" taget="_blank" href="/search/%E8%AE%B0%E5%BD%95%E5%AE%A2%E6%88%B7%E7%AB%AFip/1.htm">记录客户端ip</a>
<div>有时候我们需要查看当前的mysql数据库中，有哪些客户端保持了连接，每个客户端分别保持了多少连接，可以使用下面的语句查询结果，可以直观的看到连接数。SELECTsubstring_index(host,':',1)AShostname,state,count(*)FROMinformation_schema.processlistGROUPBYstate,hostname;输出结果：mysql>S</div>
</li>
<li><a href="/article/1891965733051625472.htm"
title="python 山脊图_（数据科学学习手札98）纯Python绘制满满艺术感的山脊地图" target="_blank">python 山脊图_（数据科学学习手札98）纯Python绘制满满艺术感的山脊地图</a>
<span class="text-muted">weixin_39780255</span>
<a class="tag" taget="_blank" href="/search/python/1.htm">python</a><a class="tag" taget="_blank" href="/search/%E5%B1%B1%E8%84%8A%E5%9B%BE/1.htm">山脊图</a>
<div>1简介下面的这幅图可能很多读者朋友们都看到过，这是英国摇滚乐队JoyDivision在1979年发行的其第一张录音室专辑UnknownPleasures的封面，由艺术家PeterSaville基于射电脉冲星信号的数据图创作而成，成为了一种流行文化的符号标志。图1类似图1的风格，在地图制作中也存在着一种山脊地图，基于记录地表海拔信息的高程数据，我们可以利用水平方向上的基于实际位置海拔高度的曲线，来对</div>
</li>
<li><a href="/article/1891964977246433280.htm"
title="[学习笔记-SLAM篇]Ubuntu16.04+ROS下配置ORB-SLAM3——后续" target="_blank">[学习笔记-SLAM篇]Ubuntu16.04+ROS下配置ORB-SLAM3——后续</a>
<span class="text-muted">warningm_dm</span>
<a class="tag" taget="_blank" href="/search/SLAM%E7%AF%87/1.htm">SLAM篇</a>
<div>作为一篇后记，就主要做补充之用。索引1.编译不显示warning2.LocalMapping报错3.KannalaBrandt8报错4.RGB-D设置文件1.编译不显示warning编译的过程中有报错，但是一贯的，warning太多了，所以修改一下，便于找错。参考ubuntu18.04配置ORB-SLAM3。将ORB-SLAM3的CMakeLists.txt中的-Wall后面加上-w，可屏蔽编译的</div>
</li>
<li><a href="/article/1891962954203590656.htm"
title="ffmpeg实现视频拼接，图片生成视频demo" target="_blank">ffmpeg实现视频拼接，图片生成视频demo</a>
<span class="text-muted">德玛西亚没有明天</span>
<a class="tag" taget="_blank" href="/search/ffmpeg/1.htm">ffmpeg</a><a class="tag" taget="_blank" href="/search/%E9%9F%B3%E8%A7%86%E9%A2%91/1.htm">音视频</a>
<div>利用ffmpeg实现图片生成视频，视频拼接，添加字幕等$img){//添加背景//$returnImg="backImg{$key}.jpg";//$output="output{$key}.mp4";//$returnImg=$this->addBack($img,$returnImg);$output="output0.mp4";$returnImg="backImg0.jpg";$time=</div>
</li>
<li><a href="/article/1891960429316468736.htm"
title="嵌入式学习第十七天--fileio" target="_blank">嵌入式学习第十七天--fileio</a>
<span class="text-muted">嵌入式小黑子</span>
<a class="tag" taget="_blank" href="/search/linxu%E9%AB%98%E7%BA%A7%E7%BC%96%E7%A8%8B/1.htm">linxu高级编程</a><a class="tag" taget="_blank" href="/search/%E5%AD%A6%E4%B9%A0/1.htm">学习</a><a class="tag" taget="_blank" href="/search/spring/1.htm">spring</a><a class="tag" taget="_blank" href="/search/java/1.htm">java</a>
<div>fileIo文件操作:缓存操作对象具体操作标准IO全缓存/行缓存文件指针(流指针)FILE*1.打开--fopen(库函数)2.读写fgetc/fputcfgets/fputsfread/fwrite3.关闭fclose4.定位fseek/ftell/rewind空洞文件文件IO不带缓存文件描述符(整数)1.打开--open(系统调用)2.读写--read/write3.关闭--close4.定位</div>
</li>
<li><a href="/article/1891958158545448960.htm"
title="Nexus私服仓库本地推送401错误" target="_blank">Nexus私服仓库本地推送401错误</a>
<span class="text-muted">fengdongnan</span>
<a class="tag" taget="_blank" href="/search/intellij-idea/1.htm">intellij-idea</a><a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/ide/1.htm">ide</a>
<div>1.报错信息:Failedtoexecutegoalorg.apache.maven.plugins:maven-deploy-plugin:2.7:deploy(default-deploy)onprojectmaven-01-parent:Failedtodeployartifacts:Couldnottransferartifactorg.example:maven-01-parent:po</div>
</li>
<li><a href="/article/1891954504480387072.htm"
title="【Python 学习 / 5】函数详解（定义、参数、作用域、lambda、内置函数）" target="_blank">【Python 学习 / 5】函数详解（定义、参数、作用域、lambda、内置函数）</a>
<span class="text-muted">卜及中</span>
<a class="tag" taget="_blank" href="/search/Python%E5%9F%BA%E7%A1%80/1.htm">Python基础</a><a class="tag" taget="_blank" href="/search/python/1.htm">python</a><a class="tag" taget="_blank" href="/search/%E5%AD%A6%E4%B9%A0/1.htm">学习</a><a class="tag" taget="_blank" href="/search/%E5%BC%80%E5%8F%91%E8%AF%AD%E8%A8%80/1.htm">开发语言</a>
<div>文章目录一、函数1.定义函数1.1基本函数定义1.2带参数的函数1.3带返回值的函数2.参数传递2.1位置参数2.2默认参数2.3可变参数2.3.1使用`*args`2.3.2使用`**kwargs`2.4参数的混合使用3.作用域3.1局部和全局变量3.2`global`关键字输出：3.3`nonlocal`关键字输出：4.lambda表达式4.1基本用法4.2与`map()`、`filter()</div>
</li>
<li><a href="/article/1891947826292781056.htm"
title="leetcode简单(181-200)python" target="_blank">leetcode简单(181-200)python</a>
<span class="text-muted">九日火</span>
<a class="tag" taget="_blank" href="/search/leetcode/1.htm">leetcode</a><a class="tag" taget="_blank" href="/search/python/1.htm">python</a>
<div>762.PrimeNumberofSetBitsinBinaryRepresentation(e-181)GiventwointegersLandR,findthecountofnumbersintherange[L,R](inclusive)havingaprimenumberofsetbitsintheirbinaryrepresentation.(Recallthatthenumberofs</div>
</li>
<li><a href="/article/1891945557568581632.htm"
title="Kafka日志文件探秘：从数据解析到故障排查的完整指南" target="_blank">Kafka日志文件探秘：从数据解析到故障排查的完整指南</a>
<span class="text-muted">磐基Stack专业服务团队</span>
<a class="tag" taget="_blank" href="/search/Kafka/1.htm">Kafka</a><a class="tag" taget="_blank" href="/search/kafka/1.htm">kafka</a><a class="tag" taget="_blank" href="/search/%E5%88%86%E5%B8%83%E5%BC%8F/1.htm">分布式</a>
<div>#作者：猎人文章目录1、查看Log文件基本数据信息2、index文件健康性检查(--index-sanity-check)3、转储文件(--max-message-size)4、偏移量解码(--offsets-decoder)5、日志数据解析(--transaction-log-decoder)6、查询Log文件具体数据(--print-data-log)7、查看index文件具体内容8、查看ti</div>
</li>
<li><a href="/article/1891942405255524352.htm"
title="Spring Boot整合EasyExcel并行导出及Zip压缩下载" target="_blank">Spring Boot整合EasyExcel并行导出及Zip压缩下载</a>
<span class="text-muted">harmful_sheep</span>
<a class="tag" taget="_blank" href="/search/springboot/1.htm">springboot</a><a class="tag" taget="_blank" href="/search/spring/1.htm">spring</a><a class="tag" taget="_blank" href="/search/boot/1.htm">boot</a><a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/%E5%90%8E%E7%AB%AF/1.htm">后端</a>
<div>1.项目依赖首先，我们需要引入相关的依赖，包括SpringBoot和阿里巴巴的EasyExcel组件，此外还需要使用Java的Zip工具进行压缩操作。org.springframework.bootspring-boot-starter-webcom.alibabaeasyexcel3.0.5commons-iocommons-io2.11.02.创建数据导出逻辑接下来，我们定义数据导出逻辑。在这</div>
</li>
<li><a href="/article/1891941391945232384.htm"
title="Leetcode 3458. Select K Disjoint Special Substrings" target="_blank">Leetcode 3458. Select K Disjoint Special Substrings</a>
<span class="text-muted">Espresso Macchiato</span>
<a class="tag" taget="_blank" href="/search/leetcode%E7%AC%94%E8%AE%B0/1.htm">leetcode笔记</a><a class="tag" taget="_blank" href="/search/leetcode/1.htm">leetcode</a><a class="tag" taget="_blank" href="/search/3458/1.htm">3458</a><a class="tag" taget="_blank" href="/search/leetcode/1.htm">leetcode</a><a class="tag" taget="_blank" href="/search/medium/1.htm">medium</a><a class="tag" taget="_blank" href="/search/leetcode%E5%91%A8%E8%B5%9B437/1.htm">leetcode周赛437</a><a class="tag" taget="_blank" href="/search/%E5%8A%A8%E6%80%81%E8%A7%84%E5%88%92/1.htm">动态规划</a><a class="tag" taget="_blank" href="/search/%E5%AD%97%E7%AC%A6%E4%B8%B2%E5%88%87%E5%88%86/1.htm">字符串切分</a>
<div>Leetcode3458.SelectKDisjointSpecialSubstrings1.解题思路2.代码实现题目链接：3458.SelectKDisjointSpecialSubstrings1.解题思路这一题我的思路的话就是找出给定的字符串当中做多能得到的特殊子串的数目，然后判断其是否大于给定值kkk即可。然后关于如何求字符串能够获得的特殊子串的最大数目，我的思路是使用动态规划的思路。首先</div>
</li>
<li><a href="/article/1891935719862104064.htm"
title="处理react中使用TS或者eslint页面报错问题" target="_blank">处理react中使用TS或者eslint页面报错问题</a>
<span class="text-muted">尼古拉斯网页匠</span>
<a class="tag" taget="_blank" href="/search/react.js/1.htm">react.js</a><a class="tag" taget="_blank" href="/search/%E5%89%8D%E7%AB%AF/1.htm">前端</a><a class="tag" taget="_blank" href="/search/vue.js/1.htm">vue.js</a>
<div>在报错代码的上一行加入对应如下代码//@ts-ignore//@ts-nocheck//eslint-disable-next-line</div>
</li>
<li><a href="/article/1891934961057984512.htm"
title="PaddleOCR面板恢复python脚本--针对pdf的面板恢复" target="_blank">PaddleOCR面板恢复python脚本--针对pdf的面板恢复</a>
<span class="text-muted">zsh669</span>
<a class="tag" taget="_blank" href="/search/paddlepaddle/1.htm">paddlepaddle</a><a class="tag" taget="_blank" href="/search/ocr/1.htm">ocr</a><a class="tag" taget="_blank" href="/search/%E7%99%BE%E5%BA%A6/1.htm">百度</a><a class="tag" taget="_blank" href="/search/python/1.htm">python</a><a class="tag" taget="_blank" href="/search/pdf/1.htm">pdf</a>
<div>问题在做一个项目的时候，使用PaddleOCR提供的模型，实现对图片或者pdf进行面板恢复，并保存为.docx文档。但是，官方的文档只提供了针对图片进行面板恢复的python脚本，没有提供pdf进行面板恢复的python脚本，官方只提供了pdf面板恢复的命令行使用方法，因此，我去看了PaddleOCR的源码，将命令行方法转换为python脚本准备工作环境配置和文档请参考：\ppstructure/</div>
</li>
<li><a href="/article/1891932438096048128.htm"
title="【Elasticsearch源码解读】代码包结构概述" target="_blank">【Elasticsearch源码解读】代码包结构概述</a>
<span class="text-muted">risc123456</span>
<a class="tag" taget="_blank" href="/search/elasticsearch/1.htm">elasticsearch</a>
<div>Elasticsearch的代码库包含多个包，每个包负责不同的功能。以下是这些包的主要功能：####action封装了Elasticsearch的各种操作，如索引、搜索、删除等，提供了与集群交互的接口。####bootstrap包含启动Elasticsearch节点所需的引导程序，负责初始化环境和配置。####client/internal提供客户端与Elasticsearch集群交互的内部实现，</div>
</li>
<li><a href="/article/1891932310857641984.htm"
title="Python库 - transformers" target="_blank">Python库 - transformers</a>
<span class="text-muted">司南锤</span>
<a class="tag" taget="_blank" href="/search/PYTHON%E5%BA%93/1.htm">PYTHON库</a><a class="tag" taget="_blank" href="/search/python%E6%9C%BA%E5%99%A8%E5%AD%A6%E4%B9%A0/1.htm">python机器学习</a><a class="tag" taget="_blank" href="/search/python/1.htm">python</a><a class="tag" taget="_blank" href="/search/%E5%BC%80%E5%8F%91%E8%AF%AD%E8%A8%80/1.htm">开发语言</a>
<div>transformers库是由HuggingFace开发的一个非常流行的Python库，用于自然语言处理（NLP）任务。它提供了大量的预训练模型，这些模型可以用于各种NLP任务，如文本分类、问答、翻译、摘要生成等。以下是关于transformers库的详细介绍：1.主要特点预训练模型：transformers库包含了多种预训练的语言模型，如BERT、GPT、T5、XLNet等。这些模型在大规模文本</div>
</li>
<li><a href="/article/1891931805938937856.htm"
title="【NLP-04】tranformers库保姆级使用教程---以BERT模型为例" target="_blank">【NLP-04】tranformers库保姆级使用教程---以BERT模型为例</a>
<span class="text-muted">云天徽上</span>
<a class="tag" taget="_blank" href="/search/NLP/1.htm">NLP</a><a class="tag" taget="_blank" href="/search/bert/1.htm">bert</a><a class="tag" taget="_blank" href="/search/%E4%BA%BA%E5%B7%A5%E6%99%BA%E8%83%BD/1.htm">人工智能</a><a class="tag" taget="_blank" href="/search/%E6%B7%B1%E5%BA%A6%E5%AD%A6%E4%B9%A0/1.htm">深度学习</a><a class="tag" taget="_blank" href="/search/%E8%87%AA%E7%84%B6%E8%AF%AD%E8%A8%80%E5%A4%84%E7%90%86/1.htm">自然语言处理</a><a class="tag" taget="_blank" href="/search/%E6%9C%BA%E5%99%A8%E5%AD%A6%E4%B9%A0/1.htm">机器学习</a><a class="tag" taget="_blank" href="/search/numpy/1.htm">numpy</a><a class="tag" taget="_blank" href="/search/%E4%BF%A1%E6%81%AF%E5%8F%AF%E8%A7%86%E5%8C%96/1.htm">信息可视化</a>
<div>安装要安装一个非常轻量级的Transformers库，您可以执行以下步骤：1、打开终端或命令提示符。2、运行以下命令来安装Transformers库：pipinstalltransformers这将使用pip工具从PythonPackageIndex（PyPI）下载并安装Transformers库。请确保您的计算机上已经安装了pip。然后，您可以在Python代码中导入Transformers库：</div>
</li>
<li><a href="/article/1891930671186767872.htm"
title="利用 OpenCV 进行棋盘检测与透视变换" target="_blank">利用 OpenCV 进行棋盘检测与透视变换</a>
<span class="text-muted">萧鼎</span>
<a class="tag" taget="_blank" href="/search/python%E5%9F%BA%E7%A1%80%E5%88%B0%E8%BF%9B%E9%98%B6%E6%95%99%E7%A8%8B/1.htm">python基础到进阶教程</a><a class="tag" taget="_blank" href="/search/opencv/1.htm">opencv</a><a class="tag" taget="_blank" href="/search/%E4%BA%BA%E5%B7%A5%E6%99%BA%E8%83%BD/1.htm">人工智能</a><a class="tag" taget="_blank" href="/search/%E8%AE%A1%E7%AE%97%E6%9C%BA%E8%A7%86%E8%A7%89/1.htm">计算机视觉</a>
<div>利用OpenCV进行棋盘检测与透视变换1.引言在计算机视觉领域，棋盘检测与透视变换是一个常见的任务，广泛应用于摄像机标定、文档扫描、增强现实（AR）等场景。本篇文章将详细介绍如何使用OpenCV进行棋盘检测，并通过透视变换将棋盘区域转换为一个标准的矩形图像。我们将基于一段Python代码进行分析，代码的主要任务包括：读取图像并进行预处理（灰度转换、自适应直方图均衡化、去噪）检测边缘并提取棋盘区域计</div>
</li>
<li><a href="/article/30.htm"
title="Java实现的基于模板的网页结构化信息精准抽取组件：HtmlExtractor" target="_blank">Java实现的基于模板的网页结构化信息精准抽取组件：HtmlExtractor</a>
<span class="text-muted">yangshangchuan</span>
<a class="tag" taget="_blank" href="/search/%E4%BF%A1%E6%81%AF%E6%8A%BD%E5%8F%96/1.htm">信息抽取</a><a class="tag" taget="_blank" href="/search/HtmlExtractor/1.htm">HtmlExtractor</a><a class="tag" taget="_blank" href="/search/%E7%B2%BE%E5%87%86%E6%8A%BD%E5%8F%96/1.htm">精准抽取</a><a class="tag" taget="_blank" href="/search/%E4%BF%A1%E6%81%AF%E9%87%87%E9%9B%86/1.htm">信息采集</a>
<div>HtmlExtractor是一个Java实现的基于模板的网页结构化信息精准抽取组件，本身并不包含爬虫功能，但可被爬虫或其他程序调用以便更精准地对网页结构化信息进行抽取。
HtmlExtractor是为大规模分布式环境设计的，采用主从架构，主节点负责维护抽取规则，从节点向主节点请求抽取规则，当抽取规则发生变化，主节点主动通知从节点，从而能实现抽取规则变化之后的实时动态生效。
如</div>
</li>
<li><a href="/article/157.htm"
title="java编程思想 -- 多态" target="_blank">java编程思想 -- 多态</a>
<span class="text-muted">百合不是茶</span>
<a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/%E5%A4%9A%E6%80%81%E8%AF%A6%E8%A7%A3/1.htm">多态详解</a>
<div>一: 向上转型和向下转型
面向对象中的转型只会发生在有继承关系的子类和父类中（接口的实现也包括在这里）。父类：人 子类：男人向上转型： Person p = new Man() ; //向上转型不需要强制类型转化向下转型： Man man =</div>
</li>
<li><a href="/article/284.htm"
title="[自动数据处理]稳扎稳打,逐步形成自有ADP系统体系" target="_blank">[自动数据处理]稳扎稳打,逐步形成自有ADP系统体系</a>
<span class="text-muted">comsci</span>
<a class="tag" taget="_blank" href="/search/dp/1.htm">dp</a>
<div>
对于国内的IT行业来讲,虽然我们已经有了"两弹一星",在局部领域形成了自己独有的技术特征,并初步摆脱了国外的控制...但是前面的路还很长....
首先是我们的自动数据处理系统还无法处理很多高级工程...中等规模的拓扑分析系统也没有完成,更加复杂的</div>
</li>
<li><a href="/article/411.htm"
title="storm 自定义 日志文件" target="_blank">storm 自定义 日志文件</a>
<span class="text-muted">商人shang</span>
<a class="tag" taget="_blank" href="/search/storm/1.htm">storm</a><a class="tag" taget="_blank" href="/search/cluster/1.htm">cluster</a><a class="tag" taget="_blank" href="/search/logback/1.htm">logback</a>
<div>Storm中的日志级级别默认为INFO，并且，日志文件是根据worker号来进行区分的，这样，同一个log文件中的信息不一定是一个业务的，这样就会有以下两个需求出现：
1. 想要进行一些调试信息的输出
2. 调试信息或者业务日志信息想要输出到一些固定的文件中
不要怕，不要烦恼，其实Storm已经提供了这样的支持，可以通过自定义logback 下的 cluster.xml 来输</div>
</li>
<li><a href="/article/538.htm"
title="Extjs3 SpringMVC使用 @RequestBody 标签问题记录" target="_blank">Extjs3 SpringMVC使用 @RequestBody 标签问题记录</a>
<span class="text-muted">21jhf</span>
<div>springMVC使用 @RequestBody(required = false) UserVO userInfo
传递json对象数据，往往会出现http 415，400,500等错误，总结一下需要使用ajax提交json数据才行，ajax提交使用proxy，参数为jsonData，不能为params；另外，需要设置Content-type属性为json，代码如下：
（由于使用了父类aaa</div>
</li>
<li><a href="/article/665.htm"
title="一些排错方法" target="_blank">一些排错方法</a>
<span class="text-muted">文强chu</span>
<a class="tag" taget="_blank" href="/search/%E6%96%B9%E6%B3%95/1.htm">方法</a>
<div>1、java.lang.IllegalStateException: Class invariant violation
at org.apache.log4j.LogManager.getLoggerRepository(LogManager.java:199)at org.apache.log4j.LogManager.getLogger(LogManager.java:228)
at o</div>
</li>
<li><a href="/article/792.htm"
title="Swing中文件恢复我觉得很难" target="_blank">Swing中文件恢复我觉得很难</a>
<span class="text-muted">小桔子</span>
<a class="tag" taget="_blank" href="/search/swing/1.htm">swing</a>
<div> 我那个草了！老大怎么回事，怎么做项目评估的？只会说相信你可以做的，试一下，有的是时间！
用java开发一个图文处理工具，类似word，任意位置插入、拖动、删除图片以及文本等。文本框、流程图等，数据保存数据库，其余可保存pdf格式。ok,姐姐千辛万苦，</div>
</li>
<li><a href="/article/919.htm"
title="php 文件操作" target="_blank">php 文件操作</a>
<span class="text-muted">aichenglong</span>
<a class="tag" taget="_blank" href="/search/PHP/1.htm">PHP</a><a class="tag" taget="_blank" href="/search/%E8%AF%BB%E5%8F%96%E6%96%87%E4%BB%B6/1.htm">读取文件</a><a class="tag" taget="_blank" href="/search/%E5%86%99%E5%85%A5%E6%96%87%E4%BB%B6/1.htm">写入文件</a>
<div>1 写入文件
@$fp=fopen("$DOCUMENT_ROOT/order.txt", "ab");
if(!$fp){
echo "open file error" ;
exit;
}
$outputstring="date:"." \t tire:".$tire."</div>
</li>
<li><a href="/article/1046.htm"
title="MySQL的btree索引和hash索引的区别" target="_blank">MySQL的btree索引和hash索引的区别</a>
<span class="text-muted">AILIKES</span>
<a class="tag" taget="_blank" href="/search/%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84/1.htm">数据结构</a><a class="tag" taget="_blank" href="/search/mysql/1.htm">mysql</a><a class="tag" taget="_blank" href="/search/%E7%AE%97%E6%B3%95/1.htm">算法</a>
<div>Hash 索引结构的特殊性，其 检索效率非常高，索引的检索可以一次定位，不像B-Tree 索引需要从根节点到枝节点，最后才能访问到页节点这样多次的IO访问，所以 Hash 索引的查询效率要远高于 B-Tree 索引。
可能很多人又有疑问了，既然 Hash 索引的效率要比 B-Tree 高很多，为什么大家不都用 Hash 索引而还要使用 B-Tree 索引呢</div>
</li>
<li><a href="/article/1173.htm"
title="JAVA的抽象--- 接口 --实现" target="_blank">JAVA的抽象--- 接口 --实现</a>
<span class="text-muted">百合不是茶</span>
<div>抽象 接口 实现接口
//抽象 类 ,方法
//定义一个公共抽象的类 ,并在类中定义一个抽象的方法体
抽象的定义使用abstract
abstract class A 定义一个抽象类 例如：
//定义一个基类
public abstract class A{
//抽象类不能用来实例化，只能用来继承
//</div>
</li>
<li><a href="/article/1300.htm"
title="JS变量作用域实例" target="_blank">JS变量作用域实例</a>
<span class="text-muted">bijian1013</span>
<a class="tag" taget="_blank" href="/search/%E4%BD%9C%E7%94%A8%E5%9F%9F/1.htm">作用域</a>
<div><script>
var scope='hello';
function a(){
console.log(scope); //undefined
var scope='world';
console.log(scope); //world
console.log(b); </div>
</li>
<li><a href="/article/1427.htm"
title="TDD实践（二）" target="_blank">TDD实践（二）</a>
<span class="text-muted">bijian1013</span>
<a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/TDD/1.htm">TDD</a>
<div>实践题目：分解质因数
Step1：
单元测试：
package com.bijian.study.factor.test;
import java.util.Arrays;
import junit.framework.Assert;
import org.junit.Before;
import org.junit.Test;
import com.bijian.</div>
</li>
<li><a href="/article/1554.htm"
title="[MongoDB学习笔记一]MongoDB主从复制" target="_blank">[MongoDB学习笔记一]MongoDB主从复制</a>
<span class="text-muted">bit1129</span>
<a class="tag" taget="_blank" href="/search/mongodb/1.htm">mongodb</a>
<div>MongoDB称为分布式数据库，主要原因是1.基于副本集的数据备份， 2.基于切片的数据扩容。副本集解决数据的读写性能问题，切片解决了MongoDB的数据扩容问题。
事实上，MongoDB提供了主从复制和副本复制两种备份方式，在MongoDB的主从复制和副本复制集群环境中，只有一台作为主服务器，另外一台或者多台服务器作为从服务器。 本文介绍MongoDB的主从复制模式，需要指明</div>
</li>
<li><a href="/article/1681.htm"
title="【HBase五】Java API操作HBase" target="_blank">【HBase五】Java API操作HBase</a>
<span class="text-muted">bit1129</span>
<a class="tag" taget="_blank" href="/search/hbase/1.htm">hbase</a>
<div>import java.io.IOException;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.ha</div>
</li>
<li><a href="/article/1808.htm"
title="python调用zabbix api接口实时展示数据" target="_blank">python调用zabbix api接口实时展示数据</a>
<span class="text-muted">ronin47</span>
<div>zabbix api接口来进行展示。经过思考之后，计划获取如下内容： 1、 获得认证密钥 2、 获取zabbix所有的主机组 3、 获取单个组下的所有主机 4、 获取某个主机下的所有监控项 </div>
</li>
<li><a href="/article/1935.htm"
title="jsp取得绝对路径" target="_blank">jsp取得绝对路径</a>
<span class="text-muted">byalias</span>
<a class="tag" taget="_blank" href="/search/%E7%BB%9D%E5%AF%B9%E8%B7%AF%E5%BE%84/1.htm">绝对路径</a>
<div>在JavaWeb开发中，常使用绝对路径的方式来引入JavaScript和CSS文件，这样可以避免因为目录变动导致引入文件找不到的情况，常用的做法如下：
一、使用${pageContext.request.contextPath}
代码” ${pageContext.request.contextPath}”的作用是取出部署的应用程序名，这样不管如何部署，所用路径都是正确的。
</div>
</li>
<li><a href="/article/2062.htm"
title="Java定时任务调度：用ExecutorService取代Timer" target="_blank">Java定时任务调度：用ExecutorService取代Timer</a>
<span class="text-muted">bylijinnan</span>
<a class="tag" taget="_blank" href="/search/java/1.htm">java</a>
<div>《Java并发编程实战》一书提到的用ExecutorService取代Java Timer有几个理由，我认为其中最重要的理由是：
如果TimerTask抛出未检查的异常，Timer将会产生无法预料的行为。Timer线程并不捕获异常，所以 TimerTask抛出的未检查的异常会终止timer线程。这种情况下，Timer也不会再重新恢复线程的执行了;它错误的认为整个Timer都被取消了。此时，已经被</div>
</li>
<li><a href="/article/2189.htm"
title="SQL 优化原则" target="_blank">SQL 优化原则</a>
<span class="text-muted">chicony</span>
<a class="tag" taget="_blank" href="/search/sql/1.htm">sql</a>
<div>
一、问题的提出
在应用系统开发初期，由于开发数据库数据比较少，对于查询SQL语句，复杂视图的的编写等体会不出SQL语句各种写法的性能优劣，但是如果将应用系统提交实际应用后，随着数据库中数据的增加，系统的响应速度就成为目前系统需要解决的最主要的问题之一。系统优化中一个很重要的方面就是SQL语句的优化。对于海量数据，劣质SQL语句和优质SQL语句之间的速度差别可以达到上百倍，可见对于一个系统</div>
</li>
<li><a href="/article/2316.htm"
title="java 线程弹球小游戏" target="_blank">java 线程弹球小游戏</a>
<span class="text-muted">CrazyMizzz</span>
<a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/%E6%B8%B8%E6%88%8F/1.htm">游戏</a>
<div>最近java学到线程，于是做了一个线程弹球的小游戏，不过还没完善
这里是提纲
1.线程弹球游戏实现
1.实现界面需要使用哪些API类
JFrame
JPanel
JButton
FlowLayout
Graphics2D
Thread
Color
ActionListener
ActionEvent
MouseListener
Mouse</div>
</li>
<li><a href="/article/2443.htm"
title="hadoop jps出现process information unavailable提示解决办法" target="_blank">hadoop jps出现process information unavailable提示解决办法</a>
<span class="text-muted">daizj</span>
<a class="tag" taget="_blank" href="/search/hadoop/1.htm">hadoop</a><a class="tag" taget="_blank" href="/search/jps/1.htm">jps</a>
<div>hadoop jps出现process information unavailable提示解决办法
jps时出现如下信息：
3019 -- process information unavailable3053 -- process information unavailable2985 -- process information unavailable2917 -- </div>
</li>
<li><a href="/article/2570.htm"
title="PHP图片水印缩放类实现" target="_blank">PHP图片水印缩放类实现</a>
<span class="text-muted">dcj3sjt126com</span>
<a class="tag" taget="_blank" href="/search/PHP/1.htm">PHP</a>
<div>
<?php
class Image{
private $path;
function __construct($path='./'){
$this->path=rtrim($path,'/').'/';
}
//水印函数，参数：背景图，水印图，位置，前缀,TMD透明度
public function water($b,$l,$pos</div>
</li>
<li><a href="/article/2697.htm"
title="IOS控件学习：UILabel常用属性与用法" target="_blank">IOS控件学习：UILabel常用属性与用法</a>
<span class="text-muted">dcj3sjt126com</span>
<a class="tag" taget="_blank" href="/search/ios/1.htm">ios</a><a class="tag" taget="_blank" href="/search/UILabel/1.htm">UILabel</a>
<div>参考网站：
http://shijue.me/show_text/521c396a8ddf876566000007
http://www.tuicool.com/articles/zquENb
http://blog.csdn.net/a451493485/article/details/9454695
http://wiki.eoe.cn/page/iOS_pptl_artile_281</div>
</li>
<li><a href="/article/2824.htm"
title="完全手动建立maven骨架" target="_blank">完全手动建立maven骨架</a>
<span class="text-muted">eksliang</span>
<a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/eclipse/1.htm">eclipse</a><a class="tag" taget="_blank" href="/search/Web/1.htm">Web</a>
<div>建一个 JAVA 项目 ：
mvn archetype:create
-DgroupId=com.demo
-DartifactId=App
[-Dversion=0.0.1-SNAPSHOT]
[-Dpackaging=jar]
建一个 web 项目 ：
mvn archetype:create
-DgroupId=com.demo
-DartifactId=web-a</div>
</li>
<li><a href="/article/2951.htm"
title="配置清单" target="_blank">配置清单</a>
<span class="text-muted">gengzg</span>
<a class="tag" taget="_blank" href="/search/%E9%85%8D%E7%BD%AE/1.htm">配置</a>
<div>1、修改grub启动的内核版本
vi /boot/grub/grub.conf
将default 0改为1
拷贝mt7601Usta.ko到/lib文件夹
拷贝RT2870STA.dat到 /etc/Wireless/RT2870STA/文件夹
拷贝wifiscan到bin文件夹，chmod 775 /bin/wifiscan
拷贝wifiget.sh到bin文件夹，chm</div>
</li>
<li><a href="/article/3078.htm"
title="Windows端口被占用处理方法" target="_blank">Windows端口被占用处理方法</a>
<span class="text-muted">huqiji</span>
<a class="tag" taget="_blank" href="/search/windows/1.htm">windows</a>
<div>以下文章主要以80端口号为例，如果想知道其他的端口号也可以使用该方法..........................1、在windows下如何查看80端口占用情况?是被哪个进程占用?如何终止等. 这里主要是用到windows下的DOS工具,点击"开始"--"运行",输入&</div>
</li>
<li><a href="/article/3205.htm"
title="开源ckplayer 网页播放器， 跨平台(html5, mobile)，flv, f4v, mp4, rtmp协议. webm, ogg, m3u8 ！" target="_blank">开源ckplayer 网页播放器， 跨平台(html5, mobile)，flv, f4v, mp4, rtmp协议. webm, ogg, m3u8 ！</a>
<span class="text-muted">天梯梦</span>
<a class="tag" taget="_blank" href="/search/mobile/1.htm">mobile</a>
<div>CKplayer，其全称为超酷flv播放器，它是一款用于网页上播放视频的软件，支持的格式有：http协议上的flv,f4v,mp4格式，同时支持rtmp视频流格 式播放，此播放器的特点在于用户可以自己定义播放器的风格，诸如播放/暂停按钮，静音按钮，全屏按钮都是以外部图片接口形式调用，用户根据自己的需要制作 出播放器风格所需要使用的各个按钮图片然后替换掉原始风格里相应的图片就可以制作出自己的风格了，</div>
</li>
<li><a href="/article/3332.htm"
title="简单工厂设计模式" target="_blank">简单工厂设计模式</a>
<span class="text-muted">hm4123660</span>
<a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/%E5%B7%A5%E5%8E%82%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/1.htm">工厂设计模式</a><a class="tag" taget="_blank" href="/search/%E7%AE%80%E5%8D%95%E5%B7%A5%E5%8E%82%E6%A8%A1%E5%BC%8F/1.htm">简单工厂模式</a>
<div> 简单工厂模式（Simple Factory Pattern）属于类的创新型模式，又叫静态工厂方法模式。是通过专门定义一个类来负责创建其他类的实例，被创建的实例通常都具有共同的父类。简单工厂模式是由一个工厂对象决定创建出哪一种产品类的实例。简单工厂模式是工厂模式家族中最简单实用的模式，可以理解为是不同工厂模式的一个特殊实现。 </div>
</li>
<li><a href="/article/3459.htm"
title="maven笔记" target="_blank">maven笔记</a>
<span class="text-muted">zhb8015</span>
<a class="tag" taget="_blank" href="/search/maven/1.htm">maven</a>
<div>跳过测试阶段：
mvn package -DskipTests
临时性跳过测试代码的编译：
mvn package -Dmaven.test.skip=true
maven.test.skip同时控制maven-compiler-plugin和maven-surefire-plugin两个插件的行为，即跳过编译，又跳过测试。
指定测试类
mvn test</div>
</li>
<li><a href="/article/3586.htm"
title="非mapreduce生成Hfile，然后导入hbase当中" target="_blank">非mapreduce生成Hfile，然后导入hbase当中</a>
<span class="text-muted">Stark_Summer</span>
<a class="tag" taget="_blank" href="/search/map/1.htm">map</a><a class="tag" taget="_blank" href="/search/hbase/1.htm">hbase</a><a class="tag" taget="_blank" href="/search/reduce/1.htm">reduce</a><a class="tag" taget="_blank" href="/search/Hfile/1.htm">Hfile</a><a class="tag" taget="_blank" href="/search/path%E5%AE%9E%E4%BE%8B/1.htm">path实例</a>
<div>最近一个群友的boss让研究hbase，让hbase的入库速度达到5w+/s，这可愁死了，4台个人电脑组成的集群，多线程入库调了好久，速度也才1w左右，都没有达到理想的那种速度，然后就想到了这种方式，但是网上多是用mapreduce来实现入库，而现在的需求是实时入库，不生成文件了，所以就只能自己用代码实现了，但是网上查了很多资料都没有查到，最后在一个网友的指引下，看了源码，最后找到了生成Hfile</div>
</li>
<li><a href="/article/3713.htm"
title="jsp web tomcat 编码问题" target="_blank">jsp web tomcat 编码问题</a>
<span class="text-muted">王新春</span>
<a class="tag" taget="_blank" href="/search/tomcat/1.htm">tomcat</a><a class="tag" taget="_blank" href="/search/jsp/1.htm">jsp</a><a class="tag" taget="_blank" href="/search/pageEncode/1.htm">pageEncode</a>
<div>今天配置jsp项目在tomcat上，windows上正常，而linux上显示乱码，最后定位原因为tomcat 的server.xml 文件的配置，添加 URIEncoding 属性：
<Connector port="8080" protocol="HTTP/1.1"
connectionTi</div>
</li>
</ul>
</div>
</div>
</div>
<div>
<div class="container">
<div class="indexes">
<strong>按字母分类：</strong>
<a href="/tags/A/1.htm" target="_blank">A</a><a href="/tags/B/1.htm" target="_blank">B</a><a href="/tags/C/1.htm" target="_blank">C</a><a
href="/tags/D/1.htm" target="_blank">D</a><a href="/tags/E/1.htm" target="_blank">E</a><a href="/tags/F/1.htm" target="_blank">F</a><a
href="/tags/G/1.htm" target="_blank">G</a><a href="/tags/H/1.htm" target="_blank">H</a><a href="/tags/I/1.htm" target="_blank">I</a><a
href="/tags/J/1.htm" target="_blank">J</a><a href="/tags/K/1.htm" target="_blank">K</a><a href="/tags/L/1.htm" target="_blank">L</a><a
href="/tags/M/1.htm" target="_blank">M</a><a href="/tags/N/1.htm" target="_blank">N</a><a href="/tags/O/1.htm" target="_blank">O</a><a
href="/tags/P/1.htm" target="_blank">P</a><a href="/tags/Q/1.htm" target="_blank">Q</a><a href="/tags/R/1.htm" target="_blank">R</a><a
href="/tags/S/1.htm" target="_blank">S</a><a href="/tags/T/1.htm" target="_blank">T</a><a href="/tags/U/1.htm" target="_blank">U</a><a
href="/tags/V/1.htm" target="_blank">V</a><a href="/tags/W/1.htm" target="_blank">W</a><a href="/tags/X/1.htm" target="_blank">X</a><a
href="/tags/Y/1.htm" target="_blank">Y</a><a href="/tags/Z/1.htm" target="_blank">Z</a><a href="/tags/0/1.htm" target="_blank">其他</a>
</div>
</div>
</div>
<footer id="footer" class="mb30 mt30">
<div class="container">
<div class="footBglm">
<a target="_blank" href="/">首页</a> -
<a target="_blank" href="/custom/about.htm">关于我们</a> -
<a target="_blank" href="/search/Java/1.htm">站内搜索</a> -
<a target="_blank" href="/sitemap.txt">Sitemap</a> -
<a target="_blank" href="/custom/delete.htm">侵权投诉</a>
</div>
<div class="copyright">版权所有 IT知识库 CopyRight © 2000-2050 E-COM-NET.COM , All Rights Reserved.
<!-- <a href="https://beian.miit.gov.cn/" rel="nofollow" target="_blank">京ICP备09083238号</a><br>-->
</div>
</div>
</footer>
<!-- 代码高亮 -->
<script type="text/javascript" src="/static/syntaxhighlighter/scripts/shCore.js"></script>
<script type="text/javascript" src="/static/syntaxhighlighter/scripts/shLegacy.js"></script>
<script type="text/javascript" src="/static/syntaxhighlighter/scripts/shAutoloader.js"></script>
<link type="text/css" rel="stylesheet" href="/static/syntaxhighlighter/styles/shCoreDefault.css"/>
<script type="text/javascript" src="/static/syntaxhighlighter/src/my_start_1.js"></script>
</body>
</html> |
