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<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
<title>Mr.Kong</title>
<subtitle>做有积累的事情</subtitle>
<link href="/atom.xml" rel="self"/>
<link href="http://yoursite.com/"/>
<updated>2017-06-13T15:46:40.000Z</updated>
<id>http://yoursite.com/</id>
<author>
<name>Mr.Kong</name>
</author>
<generator uri="http://hexo.io/">Hexo</generator>
<entry>
<title>使用JavaMail发送邮件</title>
<link href="http://yoursite.com/2017/06/13/JavaMailSender/"/>
<id>http://yoursite.com/2017/06/13/JavaMailSender/</id>
<published>2017-06-13T15:28:04.000Z</published>
<updated>2017-06-13T15:46:40.000Z</updated>
<content type="html"><![CDATA[<h2 id="通过JavaMail发送邮件"><a href="#通过JavaMail发送邮件" class="headerlink" title="通过JavaMail发送邮件"></a>通过JavaMail发送邮件</h2><blockquote>
<p>最近遇到了一个需要发送邮件的需求，所以了解了一下Java发送邮件的方法。参考网上资料，跑了一个小Demo，特此记录一下。</p>
<p>此Demo可以实现最基本的发邮件功能，还有一些高级功能需要去摸索，比如支持html or markdown，比如添加附件。</p>
</blockquote>
<h5 id="1-申请一个163邮箱账号，kong-163-com"><a href="#1-申请一个163邮箱账号，kong-163-com" class="headerlink" title="1. 申请一个163邮箱账号，kong@163.com"></a>1. 申请一个163邮箱账号，kong@163.com</h5><h5 id="2-打开邮箱SMTP服务，设置邮箱SMTP授权码"><a href="#2-打开邮箱SMTP服务，设置邮箱SMTP授权码" class="headerlink" title="2. 打开邮箱SMTP服务，设置邮箱SMTP授权码"></a>2. 打开邮箱SMTP服务，设置邮箱SMTP授权码</h5><h5 id="3-开始Coding吧！上代码！"><a href="#3-开始Coding吧！上代码！" class="headerlink" title="3. 开始Coding吧！上代码！"></a>3. 开始Coding吧！上代码！</h5><a id="more"></a>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div></pre></td><td class="code"><pre><div class="line">import javax.mail.*;</div><div class="line">import javax.mail.internet.InternetAddress;</div><div class="line">import javax.mail.internet.MimeMessage;</div><div class="line">import java.util.Properties;</div><div class="line"></div><div class="line">//主类</div><div class="line">public class MailSender {</div><div class="line"></div><div class="line"> private static final String FROM = "kong@163.com"; //发送邮箱，必须和授权邮箱一致</div><div class="line"> private static final String TO = "kong@163.com"; //接收者邮箱，随意</div><div class="line"> private static final String HOST = "smtp.163.com"; //发送邮件服务器</div><div class="line"> private static final String USER = "kong@163.com"; //授权邮箱账户</div><div class="line"> private static final String SMTP_PASSWORD = "xxx"; //SMTP邮箱授权码</div><div class="line"> private static final String SUBJECT = "This is the Subject Line!"; //主题</div><div class="line"> private static final String TEXT = "This is actual message"; //正文</div><div class="line"></div><div class="line"></div><div class="line"> public static void main(String [] args)</div><div class="line"> {</div><div class="line"> Properties properties = System.getProperties();</div><div class="line"> properties.setProperty("mail.smtp.host", HOST);</div><div class="line"> // 需要授权，默认为false</div><div class="line"> properties.setProperty("mail.smtp.auth", "true");</div><div class="line"> Authenticator authenticator = new MyAuth(USER, SMTP_PASSWORD);</div><div class="line"> Session session = Session.getDefaultInstance(properties, authenticator);</div><div class="line"></div><div class="line"> try{</div><div class="line"> // Create a default MimeMessage object.</div><div class="line"> MimeMessage message = new MimeMessage(session);</div><div class="line"></div><div class="line"> // Set From: header field of the header.</div><div class="line"> message.setFrom(new InternetAddress(FROM));</div><div class="line"></div><div class="line"> // Set To: header field of the header.</div><div class="line"> message.addRecipient(Message.RecipientType.TO,</div><div class="line"> new InternetAddress(TO));</div><div class="line"></div><div class="line"> // Set Subject: header field</div><div class="line"> message.setSubject(SUBJECT);</div><div class="line"></div><div class="line"> // Now set the actual message</div><div class="line"> message.setText(TEXT);</div><div class="line"></div><div class="line"> // Send message</div><div class="line"> Transport.send(message);</div><div class="line"> System.out.println("Sent message successfully....");</div><div class="line"> }catch (MessagingException mex) {</div><div class="line"> mex.printStackTrace();</div><div class="line"> }</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div></pre></td><td class="code"><pre><div class="line"></div><div class="line">import javax.mail.*;</div><div class="line"></div><div class="line">//授权</div><div class="line">public class MyAuth extends Authenticator {</div><div class="line"></div><div class="line"> String userName=null;</div><div class="line"> String password=null;</div><div class="line"></div><div class="line"> public MyAuth(){</div><div class="line"> }</div><div class="line"> public MyAuth(String username, String password) {</div><div class="line"> this.userName = username;</div><div class="line"> this.password = password;</div><div class="line"> }</div><div class="line"> protected PasswordAuthentication getPasswordAuthentication(){</div><div class="line"> return new PasswordAuthentication(userName, password);</div><div class="line"> }</div><div class="line"></div><div class="line">}</div></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div></pre></td><td class="code"><pre><div class="line">依赖pom</div><div class="line"></div><div class="line"><dependency></div><div class="line"> <groupId>javax.mail</groupId></div><div class="line"> <artifactId>mail</artifactId></div><div class="line"> <version>1.4.7</version></div><div class="line"></dependency></div></pre></td></tr></table></figure>
]]></content>
<summary type="html">
<h2 id="通过JavaMail发送邮件"><a href="#通过JavaMail发送邮件" class="headerlink" title="通过JavaMail发送邮件"></a>通过JavaMail发送邮件</h2><blockquote>
<p>最近遇到了一个需要发送邮件的需求，所以了解了一下Java发送邮件的方法。参考网上资料，跑了一个小Demo，特此记录一下。</p>
<p>此Demo可以实现最基本的发邮件功能，还有一些高级功能需要去摸索，比如支持html or markdown，比如添加附件。</p>
</blockquote>
<h5 id="1-申请一个163邮箱账号，kong-163-com"><a href="#1-申请一个163邮箱账号，kong-163-com" class="headerlink" title="1. 申请一个163邮箱账号，kong@163.com"></a>1. 申请一个163邮箱账号，kong@163.com</h5><h5 id="2-打开邮箱SMTP服务，设置邮箱SMTP授权码"><a href="#2-打开邮箱SMTP服务，设置邮箱SMTP授权码" class="headerlink" title="2. 打开邮箱SMTP服务，设置邮箱SMTP授权码"></a>2. 打开邮箱SMTP服务，设置邮箱SMTP授权码</h5><h5 id="3-开始Coding吧！上代码！"><a href="#3-开始Coding吧！上代码！" class="headerlink" title="3. 开始Coding吧！上代码！"></a>3. 开始Coding吧！上代码！</h5>
</summary>
<category term="Java" scheme="http://yoursite.com/categories/Java/"/>
<category term="JavaMail" scheme="http://yoursite.com/tags/JavaMail/"/>
</entry>
<entry>
<title>运维管理平台——Ateye.md</title>
<link href="http://yoursite.com/2017/06/04/Ateye%E4%BB%8B%E7%BB%8D-md/"/>
<id>http://yoursite.com/2017/06/04/Ateye介绍-md/</id>
<published>2017-06-04T13:13:41.000Z</published>
<updated>2017-06-04T13:19:46.000Z</updated>
<content type="html"><![CDATA[<h2 id="介绍"><a href="#介绍" class="headerlink" title="介绍"></a>介绍</h2><p>Ateye系统是通用的应用运维平台，其具有应用程序行为控制和基于日志的系统监控两大类功能。使用方通过引入Ateye的client包并进行简单设置。</p>
<h2 id="主要功能"><a href="#主要功能" class="headerlink" title="主要功能"></a>主要功能</h2><ul>
<li>方法调用（重点）</li>
<li>动态开关（重点）</li>
<li>日志级别调整</li>
<li>异常监控</li>
<li>KV埋点</li>
</ul>
<a id="more"></a>
<h2 id="基本配置"><a href="#基本配置" class="headerlink" title="基本配置"></a>基本配置</h2><p>在 web.xml 里配置一个 Servlet</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div></pre></td><td class="code"><pre><div class="line"><servlet> </div><div class="line"> <servlet-name>ateye</servlet-name> </div><div class="line"> <servlet-class>com.taobao.ateye.servlet.AteyeServlet</servlet-class> </div><div class="line"> <load-on-startup>1</load-on-startup> </div><div class="line"></servlet> </div><div class="line"></div><div class="line"><servlet-mapping> </div><div class="line"> <servlet-name>ateye</servlet-name> </div><div class="line"> <url-pattern>/agent.ateye</url-pattern> </div><div class="line"></servlet-mapping></div></pre></td></tr></table></figure>
<h2 id="基本原理"><a href="#基本原理" class="headerlink" title="基本原理"></a>基本原理</h2><p>ateye-server 通过和 ateye-client 发送http请求进行通信。</p>
<p>ateye-server 负责界面操作，以及一些持久化数据，用户操作记录，应用机器注册的职责。</p>
<p>ateye-client 负责控制应用里的操作，包括通过反射调用方法，改变属性值。</p>
<p>ateye-clinet启动的时候扫描所有Spring注册的bean，通过反射拿到带有注解的方法和字段。ateye-client监听 /agent.ateye 的请求，然后反射调用方法 或者 直接设置属性值。</p>
<h2 id="系统架构图"><a href="#系统架构图" class="headerlink" title="系统架构图"></a>系统架构图</h2><p><img src="https://img.alicdn.com/tfs/TB1cHdGRFXXXXapXpXXXXXXXXXX-741-661.png" alt=""></p>
]]></content>
<summary type="html">
<h2 id="介绍"><a href="#介绍" class="headerlink" title="介绍"></a>介绍</h2><p>Ateye系统是通用的应用运维平台，其具有应用程序行为控制和基于日志的系统监控两大类功能。使用方通过引入Ateye的client包并进行简单设置。</p>
<h2 id="主要功能"><a href="#主要功能" class="headerlink" title="主要功能"></a>主要功能</h2><ul>
<li>方法调用（重点）</li>
<li>动态开关（重点）</li>
<li>日志级别调整</li>
<li>异常监控</li>
<li>KV埋点</li>
</ul>
</summary>
<category term="我在阿里学到的" scheme="http://yoursite.com/categories/%E6%88%91%E5%9C%A8%E9%98%BF%E9%87%8C%E5%AD%A6%E5%88%B0%E7%9A%84/"/>
<category term="Java" scheme="http://yoursite.com/tags/Java/"/>
</entry>
<entry>
<title>【全栈之路】Node.js爬虫（一）</title>
<link href="http://yoursite.com/2016/11/22/%E3%80%90%E5%85%A8%E6%A0%88%E4%B9%8B%E8%B7%AF%E3%80%91Node-js%E7%88%AC%E8%99%AB%EF%BC%88%E4%B8%80%EF%BC%89/"/>
<id>http://yoursite.com/2016/11/22/【全栈之路】Node-js爬虫（一）/</id>
<published>2016-11-21T18:01:08.000Z</published>
<updated>2017-05-27T08:19:56.000Z</updated>
<content type="html"><![CDATA[<h3 id="使用nodejs爬取知乎的内容，然后在web中显示出来"><a href="#使用nodejs爬取知乎的内容，然后在web中显示出来" class="headerlink" title="使用nodejs爬取知乎的内容，然后在web中显示出来"></a>使用nodejs爬取知乎的内容，然后在web中显示出来</h3><blockquote>
<p><a href="https://www.zhihu.com/explore#daily-hot" target="_blank" rel="external">知乎发现URL</a></p>
<p>统计今日最热的问题和回答</p>
</blockquote>
<ul>
<li>使用request发起http请求</li>
<li>使用了cheerio解析html</li>
<li>使用了mysql保存抓取的数据</li>
<li>使用了express作web展示</li>
</ul>
<h2 id=""><a href="#" class="headerlink" title=""></a><a id="more"></a></h2><ul>
<li><p>字段包括</p>
<ul>
<li>问题title</li>
<li>热门回答url</li>
<li>回答者姓名</li>
<li>点赞数</li>
<li>回答者badge</li>
<li>回答者title</li>
<li>回答内容摘要</li>
<li>评论数</li>
</ul>
</li>
<li><p>设计</p>
<ul>
<li>fetcher.js: 负责下载网页</li>
<li>parser.js: 解析html返回需要保存的数据</li>
<li>zhihuDao.js: 数据表的操作</li>
</ul>
</li>
</ul>
<hr>
<h4 id="1-下载网页"><a href="#1-下载网页" class="headerlink" title="1. 下载网页"></a>1. 下载网页</h4><p><a href="#1">fetcher.js</a></p>
<p>使用request库，很简单</p>
<h4 id="2-解析网页"><a href="#2-解析网页" class="headerlink" title="2. 解析网页"></a>2. 解析网页</h4><p><a href="#2">parser.js</a></p>
<p>打开<a href="https://www.zhihu.com/explore#daily-hot" target="_blank" rel="external">知乎的发现页面</a>，使用Chrome开发者工具仔细研究想要获取的数据对应的html元素在哪里。</p>
<p><img src="/images/2.png" alt="2.png"></p>
<p>发现每一个热门的item都对应着一个class=”explore-feed feed-item”的div，Good！</p>
<p>首先挑选出所有的item</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">$(<span class="string">'.explore-feed.feed-item'</span>).each</div></pre></td></tr></table></figure>
<p><a href="http://www.w3school.com.cn/jquery/traversing_each.asp" target="_blank" rel="external">jQuery遍历each()方法</a></p>
<ul>
<li>再根据<a href="http://www.w3school.com.cn/jquery/jquery_ref_selectors.asp" target="_blank" rel="external">jQuery选择器语法</a>，基本可以选择出想要的元素<ul>
<li>${a.question_link}: 获取class为question_link的a标签</li>
<li>$(‘.explore-feed.feed-item’): 获取class具有explore-feed且feed-item的元素</li>
<li>$(‘ul’).attr(‘id’): 获取属性</li>
<li>$(‘.badge-summary > a’).text(): 获取class为badge-summary的span标签下的a标签文本</li>
<li>item(‘.summary-wrapper > [title]’): 获取class为summary-wrapper下带有title属性的元素</li>
</ul>
</li>
</ul>
<h4 id="3-保存数据"><a href="#3-保存数据" class="headerlink" title="3. 保存数据"></a>3. 保存数据</h4><p><a href="#3">zhihuDAO.js</a></p>
<p>nodejs连接mysql</p>
<p>新建mysql表zhihu_explore用来存储爬取的数据(以后换成mongodb试试(づ｡◕‿‿◕｡)づ)</p>
<p><img src="/images/3.png" alt="3.png"></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line">insert: </div><div class="line">connection.query(sql, paramArray, function(err, result){})</div></pre></td></tr></table></figure>
<ul>
<li>什么时候需要关闭connection连接？<ul>
<li>在zhihuDAO.js中<code>exports.close</code>导出关闭mysql连接函数</li>
<li>在parser.js中新增一个回调函数用来关闭mysql连接</li>
</ul>
</li>
</ul>
<h4 id="4-抓取数据保存到数据库中"><a href="#4-抓取数据保存到数据库中" class="headerlink" title="4. 抓取数据保存到数据库中"></a>4. 抓取数据保存到数据库中</h4><p><a href="#4">main.js</a></p>
<p><img src="/images/4.png" alt="4.png"></p>
<h4 id="5-启动express展示数据"><a href="#5-启动express展示数据" class="headerlink" title="5. 启动express展示数据"></a>5. 启动express展示数据</h4><p><img src="/images/1.png" alt="1.png"></p>
<hr>
<h4 id="附源码"><a href="#附源码" class="headerlink" title="附源码"></a>附源码</h4><p><a name="1"><br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// fetcher.js</span></div><div class="line"><span class="keyword">var</span> request = <span class="built_in">require</span>(<span class="string">'request'</span>)</div><div class="line"><span class="keyword">var</span> zhihuDAO = <span class="built_in">require</span>(<span class="string">'../scrapy/zhihuDAO'</span>)</div><div class="line"></div><div class="line">exports.fetch = <span class="function"><span class="keyword">function</span> (<span class="params">url, callback</span>) </span>{</div><div class="line"> request(url, <span class="function"><span class="keyword">function</span> (<span class="params">error, response, body</span>) </span>{</div><div class="line"> <span class="keyword">if</span> (!error && response.statusCode == <span class="number">200</span>) {</div><div class="line"> callback(body, zhihuDAO.insert, zhihuDAO.close)</div><div class="line"> }</div><div class="line"> })</div><div class="line">}</div></pre></td></tr></table></figure></a></p>
<p></p>
<p><a name="2"><br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// parser.js</span></div><div class="line"><span class="keyword">var</span> cheerio = <span class="built_in">require</span>(<span class="string">'cheerio'</span>);</div><div class="line"></div><div class="line">exports.parse = <span class="function"><span class="keyword">function</span> (<span class="params">html, callback, final</span>) </span>{</div><div class="line"> <span class="keyword">var</span> $ = cheerio.load(html);</div><div class="line"> $(<span class="string">'.explore-feed.feed-item'</span>).each(<span class="function"><span class="keyword">function</span> (<span class="params">index, element</span>) </span>{</div><div class="line"> <span class="keyword">var</span> item = cheerio.load(element);</div><div class="line"> <span class="keyword">var</span> question_title = item(<span class="string">'a.question_link'</span>).text();</div><div class="line"> <span class="keyword">var</span> question_url = item(<span class="string">'a.question_link'</span>).attr(<span class="string">'href'</span>);</div><div class="line"> <span class="keyword">var</span> answer_name = item(<span class="string">'.author-link'</span>).text();</div><div class="line"> <span class="keyword">var</span> support_count = item(<span class="string">'.zm-item-vote-count.js-expand.js-vote-count'</span>).text();</div><div class="line"> <span class="keyword">var</span> answer_badge = item(<span class="string">'.badge-summary > a'</span>).text();</div><div class="line"> <span class="keyword">var</span> answer_title = item(<span class="string">'.summary-wrapper > [title]'</span>).attr(<span class="string">'title'</span>);</div><div class="line"> <span class="keyword">var</span> answer_content_summary = item(<span class="string">'.zh-summary.summary.clearfix'</span>).text();</div><div class="line"> <span class="keyword">var</span> answer_content_pic = item(<span class="string">'.zh-summary.summary.clearfix > img'</span>).attr(<span class="string">'src'</span>);</div><div class="line"> answer_content_pic = answer_content_pic===<span class="literal">undefined</span>?<span class="string">''</span>:answer_content_pic;</div><div class="line"> <span class="keyword">var</span> comment_count = item(<span class="string">'.meta-item.toggle-comment.js-toggleCommentBox'</span>).text();</div><div class="line"></div><div class="line"> <span class="keyword">var</span> param = [removeN(question_title),</div><div class="line"> removeN(question_url),</div><div class="line"> removeN(answer_name),</div><div class="line"> removeN(support_count),</div><div class="line"> removeN(answer_badge),</div><div class="line"> removeN(answer_title),</div><div class="line"> removeN(answer_content_pic)+<span class="string">' '</span>+removeN(answer_content_summary),</div><div class="line"> removeN(comment_count)];</div><div class="line"> callback(param)</div><div class="line"></div><div class="line"> });</div><div class="line"> final()</div><div class="line">};</div><div class="line"></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">removeN</span>(<span class="params">str</span>) </span>{</div><div class="line"> <span class="keyword">var</span> res = <span class="string">''</span>;</div><div class="line"> <span class="keyword">if</span> (str) {</div><div class="line"> res= str.replace(<span class="regexp">/\\n/g</span>, <span class="string">''</span>);</div><div class="line"> }<span class="keyword">else</span> {</div><div class="line"> res = str;</div><div class="line"> }</div><div class="line"> <span class="keyword">return</span> res;</div><div class="line">}</div></pre></td></tr></table></figure></a></p>
<p></p>
<p><a name="3"><br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// zhihuDAO.js</span></div><div class="line"><span class="keyword">var</span> mysql = <span class="built_in">require</span>(<span class="string">'mysql'</span>)</div><div class="line"></div><div class="line"><span class="keyword">var</span> connection = mysql.createConnection({</div><div class="line"> <span class="attr">host</span>:<span class="string">'xxx'</span>,</div><div class="line"> <span class="attr">user</span>:<span class="string">'xxx'</span>,</div><div class="line"> <span class="attr">password</span>:<span class="string">'xxx'</span>,</div><div class="line"> <span class="attr">database</span>:<span class="string">'xxx'</span></div><div class="line">});</div><div class="line">connection.connect();</div><div class="line"></div><div class="line">exports.insert = <span class="function"><span class="keyword">function</span> (<span class="params">param</span>) </span>{</div><div class="line"></div><div class="line"> connection.query(<span class="string">'insert into zhihu_explore(qustion_title, answer_url, answer_name, support_count, answer_badge, answer_title, answer_content_summary, comment_count) values (?,?,?,?,?,?,?,?)'</span>, param, <span class="function"><span class="keyword">function</span>(<span class="params">err, result</span>) </span>{</div><div class="line"> <span class="keyword">if</span> (err) {</div><div class="line"> <span class="built_in">console</span>.log(<span class="string">'insert error - '</span>, err.message)</div><div class="line"> <span class="keyword">return</span> ;</div><div class="line"> }</div><div class="line"> })</div><div class="line">}</div><div class="line"></div><div class="line">exports.close = <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>{</div><div class="line"> connection.end()</div><div class="line">}</div></pre></td></tr></table></figure></a></p>
<p></p>
<p><a name="4"><br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// main.js</span></div><div class="line"><span class="keyword">var</span> fetcher = <span class="built_in">require</span>(<span class="string">'../scrapy/fetcher'</span>);</div><div class="line"><span class="keyword">var</span> parser = <span class="built_in">require</span>(<span class="string">'../scrapy/parser'</span>);</div><div class="line">fetcher.fetch(<span class="string">'https://www.zhihu.com/explore'</span>, parser.parse);</div><div class="line"></div><div class="line"><span class="comment">// node main.js</span></div></pre></td></tr></table></figure></a></p>
<p></p>
]]></content>
<summary type="html">
<h3 id="使用nodejs爬取知乎的内容，然后在web中显示出来"><a href="#使用nodejs爬取知乎的内容，然后在web中显示出来" class="headerlink" title="使用nodejs爬取知乎的内容，然后在web中显示出来"></a>使用nodejs爬取知乎的内容，然后在web中显示出来</h3><blockquote>
<p><a href="https://www.zhihu.com/explore#daily-hot">知乎发现URL</a></p>
<p>统计今日最热的问题和回答</p>
</blockquote>
<ul>
<li>使用request发起http请求</li>
<li>使用了cheerio解析html</li>
<li>使用了mysql保存抓取的数据</li>
<li>使用了express作web展示</li>
</ul>
<h2 id=""><a href="#" class="headerlink" title=""></a>
</summary>
<category term="全栈之路" scheme="http://yoursite.com/categories/%E5%85%A8%E6%A0%88%E4%B9%8B%E8%B7%AF/"/>
<category term="Node.js" scheme="http://yoursite.com/tags/Node-js/"/>
</entry>
<entry>
<title>【全栈之路】基础（一）</title>
<link href="http://yoursite.com/2016/11/21/%E3%80%90%E5%85%A8%E6%A0%88%E4%B9%8B%E8%B7%AF%E3%80%91%E5%9F%BA%E7%A1%80%EF%BC%88%E4%B8%80%EF%BC%89/"/>
<id>http://yoursite.com/2016/11/21/【全栈之路】基础（一）/</id>
<published>2016-11-20T17:24:21.000Z</published>
<updated>2017-05-27T08:20:12.000Z</updated>
<content type="html"><![CDATA[<h3 id="不懂就问，打好基础"><a href="#不懂就问，打好基础" class="headerlink" title="不懂就问，打好基础"></a>不懂就问，打好基础</h3><hr>
<ol>
<li>什么是sass、less？<ul>
<li>css的预处理工具，目前用不上</li>
</ul>
</li>
<li>什么是bower?<ul>
<li>js包管理器</li>
<li>bower依然依赖npm，相比较npm的优势在于自定义依赖的下载目录结构</li>
<li>实际项目中，使用npm作用于后端，使用bower作用于前端</li>
</ul>
</li>
<li>上手express<ul>
<li>express的路由方法<ul>
<li>app.METHOD(path, [callback…], callback)， app 是 express 对象的一个实例， METHOD 是一个 HTTP 请求方法， path 是服务器上的路径， callback 是当路由匹配时要执行的函数</li>
<li>路由句柄：区别在于路由句柄的function参数有一个next，调用next()函数可以将请求交给下一个callback处理，app.METHOD调用的时候指定一个callback数组</li>
<li>res.render()将会渲染视图模板，如jade模板</li>
<li>无论是app.use(“/“, router)还是app.get(“/“, router.function)还是app.get(“/“, callback),本质上都是app.get(“/“, callback</li>
</ul>
</li>
</ul>
</li>
<li>require模块化之 module.exports vs exports<a id="more"></a>
<ul>
<li>使用了module.exports之后，exports方法失效</li>
<li>使用module.exports，导出的模块是一个整体，可以是一个类，可以是一个数组，可以是任何合法的JavaScript对象，添加属性使用module.exports.name</li>
<li><a href="#1">module.exports举例</a></li>
<li>使用exports，导出的模块是一个实例化对象，可以直接使用exports.xxx导出的属性</li>
<li><a href="#2">exports举例</a></li>
</ul>
</li>
</ol>
<p><a name="1"><br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div></pre></td><td class="code"><pre><div class="line"><span class="built_in">module</span>.exports举例<span class="number">1</span>: </div><div class="line"><!-- roker.js --></div><div class="line">module.exports = function(name, age) {</div><div class="line"> this.name = name;</div><div class="line"> this.age = age;</div><div class="line"> this.about = function() {</div><div class="line"> console.log(this.name +' is '+ this.age +' years old');</div><div class="line"> };</div><div class="line">};</div><div class="line"><!-- 在另一个文件中你这样引用 --></div><div class="line">var Rocker = require('./rocker.js');</div><div class="line">var r = new Rocker('Ozzy', 62);</div><div class="line">r.about(); // Ozzy is 62 years old</div><div class="line"></div><div class="line"></div><div class="line">module.exports举例2: </div><div class="line"><!-- roker.js --></div><div class="line">module.exports = ['Lemmy Kilmister', 'Ozzy Osbourne', 'Ronnie James Dio', 'Steven Tyler', 'Mick Jagger'];</div><div class="line"><!-- 在另一个文件中你这样引用 --></div><div class="line">var rocker = require('./rocker.js');</div><div class="line">console.log('Rockin in heaven: ' + rocker[2]); //Rockin in heaven: Ronnie James Dio</div></pre></td></tr></table></figure></a></p>
<p></p>
<p><a name="2"><br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div></pre></td><td class="code"><pre><div class="line">exports举例: </div><div class="line"><!-- roker.js --></div><div class="line">exports.name = function() {</div><div class="line"> console.log('My name is Lemmy Kilmister');</div><div class="line">};</div><div class="line"><!-- 在另一个文件中你这样引用 --></div><div class="line">var rocker = require('./rocker.js');</div><div class="line">rocker.name(); // 'My name is Lemmy Kilmister'</div></pre></td></tr></table></figure></a></p>
<p></p>
<hr>
<h3 id="参考"><a href="#参考" class="headerlink" title="参考"></a>参考</h3><ul>
<li><a href="http://www.cnblogs.com/pigtail/archive/2013/01/14/2859555.html" target="_blank" rel="external">nodejs中exports与module.exports的区别</a></li>
</ul>
]]></content>
<summary type="html">
<h3 id="不懂就问，打好基础"><a href="#不懂就问，打好基础" class="headerlink" title="不懂就问，打好基础"></a>不懂就问，打好基础</h3><hr>
<ol>
<li>什么是sass、less？<ul>
<li>css的预处理工具，目前用不上</li>
</ul>
</li>
<li>什么是bower?<ul>
<li>js包管理器</li>
<li>bower依然依赖npm，相比较npm的优势在于自定义依赖的下载目录结构</li>
<li>实际项目中，使用npm作用于后端，使用bower作用于前端</li>
</ul>
</li>
<li>上手express<ul>
<li>express的路由方法<ul>
<li>app.METHOD(path, [callback…], callback)， app 是 express 对象的一个实例， METHOD 是一个 HTTP 请求方法， path 是服务器上的路径， callback 是当路由匹配时要执行的函数</li>
<li>路由句柄：区别在于路由句柄的function参数有一个next，调用next()函数可以将请求交给下一个callback处理，app.METHOD调用的时候指定一个callback数组</li>
<li>res.render()将会渲染视图模板，如jade模板</li>
<li>无论是app.use(“/“, router)还是app.get(“/“, router.function)还是app.get(“/“, callback),本质上都是app.get(“/“, callback</li>
</ul>
</li>
</ul>
</li>
<li>require模块化之 module.exports vs exports
</summary>
<category term="全栈之路" scheme="http://yoursite.com/categories/%E5%85%A8%E6%A0%88%E4%B9%8B%E8%B7%AF/"/>
<category term="JavaScript" scheme="http://yoursite.com/tags/JavaScript/"/>
<category term="express" scheme="http://yoursite.com/tags/express/"/>
<category term="less" scheme="http://yoursite.com/tags/less/"/>
<category term="sass" scheme="http://yoursite.com/tags/sass/"/>
</entry>
<entry>
<title>Hello World</title>
<link href="http://yoursite.com/2016/11/18/hello-world/"/>
<id>http://yoursite.com/2016/11/18/hello-world/</id>
<published>2016-11-17T19:35:16.000Z</published>
<updated>2016-11-17T19:35:16.000Z</updated>
<content type="html"><![CDATA[<p>Welcome to <a href="https://hexo.io/" target="_blank" rel="external">Hexo</a>! This is your very first post. Check <a href="https://hexo.io/docs/" target="_blank" rel="external">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a href="https://hexo.io/docs/troubleshooting.html" target="_blank" rel="external">troubleshooting</a> or you can ask me on <a href="https://github.com/hexojs/hexo/issues" target="_blank" rel="external">GitHub</a>.</p>
<h2 id="Quick-Start"><a href="#Quick-Start" class="headerlink" title="Quick Start"></a>Quick Start</h2><a id="more"></a>
<h3 id="Create-a-new-post"><a href="#Create-a-new-post" class="headerlink" title="Create a new post"></a>Create a new post</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">$ hexo new <span class="string">"My New Post"</span></div></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/writing.html" target="_blank" rel="external">Writing</a></p>
<h3 id="Run-server"><a href="#Run-server" class="headerlink" title="Run server"></a>Run server</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">$ hexo server</div></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/server.html" target="_blank" rel="external">Server</a></p>
<h3 id="Generate-static-files"><a href="#Generate-static-files" class="headerlink" title="Generate static files"></a>Generate static files</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">$ hexo generate</div></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/generating.html" target="_blank" rel="external">Generating</a></p>
<h3 id="Deploy-to-remote-sites"><a href="#Deploy-to-remote-sites" class="headerlink" title="Deploy to remote sites"></a>Deploy to remote sites</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">$ hexo deploy</div></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/deployment.html" target="_blank" rel="external">Deployment</a></p>
]]></content>
<summary type="html">
<p>Welcome to <a href="https://hexo.io/">Hexo</a>! This is your very first post. Check <a href="https://hexo.io/docs/">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a href="https://hexo.io/docs/troubleshooting.html">troubleshooting</a> or you can ask me on <a href="https://github.com/hexojs/hexo/issues">GitHub</a>.</p>
<h2 id="Quick-Start"><a href="#Quick-Start" class="headerlink" title="Quick Start"></a>Quick Start</h2>
</summary>
<category term="me" scheme="http://yoursite.com/categories/me/"/>
<category term="hello world" scheme="http://yoursite.com/tags/hello-world/"/>
</entry>
<entry>
<title>一次日志打印问题的排查</title>
<link href="http://yoursite.com/2016/04/04/log-bug/"/>
<id>http://yoursite.com/2016/04/04/log-bug/</id>
<published>2016-04-03T18:23:08.000Z</published>
<updated>2016-11-17T19:33:43.000Z</updated>
<content type="html"><![CDATA[<h2 id="问题现象"><a href="#问题现象" class="headerlink" title="问题现象"></a>问题现象</h2><p>测试服务器上无日志打印。</p>
<h2 id="原因分析"><a href="#原因分析" class="headerlink" title="原因分析"></a>原因分析</h2><p>第一次遇到这种情况，构建成功，部署成功，然后打日志毫无反应。</p>
<p>于是我开始怀疑人生…可是不是解决办法呀！</p>
<a id="more"></a>
<p>于是我重新拉了一个崭新的线上分支部署到测试机上去，发现日志可以正常打印！</p>
<p>恩…仔细回想了一下我对开发分支的改动中…怀疑是因为修改了maven依赖导致日志的jar包冲突导致的。</p>
<p>跑到测试机上分别查询了加载的jar包，果然如此！</p>
<p><em>正常日志依赖：</em></p>
<p><img src="/images/good-lib.jpg" alt="正常日志依赖"></p>
<p><em>异常日志依赖：</em></p>
<p><img src="/images/bad-lib.jpg" alt="异常日志依赖"></p>
<p>对比得出，应该就是因为<code>logback-classic</code>和<code>logback-core</code>的依赖导致了日志打不出来。(该系统一直使用log4j日志框架)</p>
<h2 id="问题解决"><a href="#问题解决" class="headerlink" title="问题解决"></a>问题解决</h2><p>在项目根目录运行<code>mvn dependency:tree > tree</code>，打印maven依赖树。</p>
<p>排除掉所有对logback的直接和间接依赖即可。</p>
<p><strong>为了一劳永逸，直接在主pom.xml中dependencyManagement依赖logback的999-not-exist版本(空jar包)。</strong></p>
<h2 id="深入分析"><a href="#深入分析" class="headerlink" title="深入分析"></a>深入分析</h2><p>以上，问题的确解决了。</p>
<p><strong>But 究竟为什么logback包的依赖引入进来，日志就不打印了呢？</strong></p>
<p>为了解决这个疑惑，经过一番资料查询，结论是这样的：</p>
<p><strong>slf4j-log4j12.jar 与 logback-classic.jar 互斥，二者只能存在其一。</strong></p>
<h2 id="详细拓展："><a href="#详细拓展：" class="headerlink" title="详细拓展："></a>详细拓展：</h2><p>日志框架分为 <strong>接口框架</strong> 和 <strong>实现框架</strong></p>
<p>接口框架包括 Apache Common Logging（之前叫 Jakarta Commons Logging，JCL）和SLF4J。</p>
<p>实现框架包括 log4j 和 logback。</p>
<p><em>他们之间的关系如下图：</em></p>
<p><img src="/images/log.jpg" alt="架构图"></p>
<p>其中JCL-over-SLF4j的存在，是因为有些项目中已经采用了JCL架构的（因为出现的早）想要转换到SLF4J架构（因为性能高）而存在的一个桥接器。顾名思义，名字为 XXX-over-slf4j 表示将日志重定向到了slf4j中。</p>
<p><strong>由于JCL-over-SLF4J和原来的JCL具有完全相同的API，因此两者是不能共存的。排除JCL依赖的方法为将<code>commons-logging</code> 设置成<code><scope>provided</scope></code> 或者 依赖一个<code>99.0-does-not-exist</code>版本的<code>commons-logging</code>（一个空无一物的特殊jar包）</strong></p>
<p>具体的jar包调用关系为：（假设采用slf4j + log4j的组合）</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div></pre></td><td class="code"><pre><div class="line">commons-logging log</div><div class="line">-> jcl-over-slf4j</div><div class="line">-> slf4j-api</div><div class="line">-> slf4j-log4j12</div><div class="line">-> log4j</div><div class="line">-> 输出日志</div></pre></td></tr></table></figure>
<p>当既依赖了slf4j-log4j12，又依赖了logback-classic时，slf4j会产生让人非常迷惑的结果。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">LoggerFactory.getLogger(xxx.class);</div></pre></td></tr></table></figure>
<p>跟进getLogger方法中</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line">ILoggerFactory iLoggerFactory = getILoggerFactory();</div><div class="line"><span class="keyword">return</span> iLoggerFactory.getLogger(name);</div></pre></td></tr></table></figure>
<p>使用了getILoggerFactory()返回的工厂，跟进getILoggerFactory方法中</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> ILoggerFactory <span class="title">getILoggerFactory</span><span class="params">()</span> </span>{</div><div class="line"> <span class="keyword">if</span> (INITIALIZATION_STATE == UNINITIALIZED) {</div><div class="line"> INITIALIZATION_STATE = ONGOING_INITIALIZATION;</div><div class="line"> <span class="comment">//初始化</span></div><div class="line"> performInitialization();</div><div class="line"> }</div><div class="line"> <span class="keyword">switch</span> (INITIALIZATION_STATE) {</div><div class="line"> <span class="keyword">case</span> SUCCESSFUL_INITIALIZATION:</div><div class="line"> <span class="keyword">return</span> StaticLoggerBinder.getSingleton().getLoggerFactory();</div><div class="line"> <span class="keyword">case</span> NOP_FALLBACK_INITIALIZATION:</div><div class="line"> <span class="keyword">return</span> NOP_FALLBACK_FACTORY;</div><div class="line"> <span class="keyword">case</span> FAILED_INITIALIZATION:</div><div class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> IllegalStateException(UNSUCCESSFUL_INIT_MSG);</div><div class="line"> <span class="keyword">case</span> ONGOING_INITIALIZATION:</div><div class="line"> <span class="comment">// support re-entrant behavior.</span></div><div class="line"> <span class="comment">// See also http://bugzilla.slf4j.org/show_bug.cgi?id=106</span></div><div class="line"> <span class="keyword">return</span> TEMP_FACTORY;</div><div class="line"> }</div><div class="line"> <span class="keyword">throw</span> <span class="keyword">new</span> IllegalStateException(<span class="string">"Unreachable code"</span>); </div><div class="line">}</div></pre></td></tr></table></figure>
<p>上面的代码中，先初始化，然后根据初始化的结果来选择LoggerFactory。进入performInitialization()方法中</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div></pre></td><td class="code"><pre><div class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">final</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">performInitialization</span><span class="params">()</span> </span>{</div><div class="line"> bind();</div><div class="line"> <span class="keyword">if</span> (INITIALIZATION_STATE == SUCCESSFUL_INITIALIZATION) {</div><div class="line"> versionSanityCheck();</div><div class="line"> }</div><div class="line">}</div></pre></td></tr></table></figure>
<p>初始化代码中，主要完成slf4j与具体的日志实现绑定的逻辑，进入bind方法中</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div></pre></td><td class="code"><pre><div class="line">Set staticLoggerBinderPathSet = findPossibleStaticLoggerBinderPathSet();</div><div class="line"><span class="comment">// 多绑定情况打印</span></div><div class="line">reportMultipleBindingAmbiguity(staticLoggerBinderPathSet);</div><div class="line"><span class="comment">// 进行绑定</span></div><div class="line">StaticLoggerBinder.getSingleton();</div><div class="line">INITIALIZATION_STATE = SUCCESSFUL_INITIALIZATION;</div><div class="line"><span class="comment">// 打印真正的绑定实现</span></div><div class="line">reportActualBinding(staticLoggerBinderPathSet);</div><div class="line">emitSubstituteLoggerWarning();</div></pre></td></tr></table></figure>
<p>在findPossibleStaticLoggerBinderPathSet()中，寻找<code>org/slf4j/impl/StaticLoggerBinder.class</code>接口的实现类，而slf4j-log4j21和logback-classic中都有对应的实现类，当两者都存在时，<code>reportActualBinding</code>的打印情况如下：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line">SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]</div></pre></td></tr></table></figure>
<p><code>reportMultipleBindingAmbiguity</code>的打印如下：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div></pre></td><td class="code"><pre><div class="line">SLF4J: Found binding in [jar:file:/home/admin/msggrab/target/msggrab.war/WEB-INF/lib/logback-classic<span class="number">-1.0</span><span class="number">.13</span>.jar!/org/slf4j/impl/StaticLoggerBinder.<span class="keyword">class</span>]</div><div class="line">SLF4J: Found binding in [jar:file:/home/admin/msggrab/target/msggrab.war/WEB-INF/lib/slf4j-log4j12<span class="number">-1.7</span><span class="number">.5</span>.jar!/org/slf4j/impl/StaticLoggerBinder.<span class="keyword">class</span>]</div><div class="line">SLF4J: See http:<span class="comment">//www.slf4j.org/codes.html#multiple_bindings for an explanation.</span></div></pre></td></tr></table></figure>
<h3 id="而我之所以打不出日志，是因为最终选择了logback作为了StaticLoggerBinder-class的实现，如下图"><a href="#而我之所以打不出日志，是因为最终选择了logback作为了StaticLoggerBinder-class的实现，如下图" class="headerlink" title="而我之所以打不出日志，是因为最终选择了logback作为了StaticLoggerBinder.class的实现，如下图"></a>而我之所以打不出日志，是因为最终选择了logback作为了<code>StaticLoggerBinder.class</code>的实现，如下图</h3><p><img src="/images/debug.jpg" alt="debug"></p>
<p><strong>可是，为什么当slf4j-log4j12和logback都存在的情况下，会优先使用logback呢？？？</strong></p>
<p>…</p>
]]></content>
<summary type="html">
<h2 id="问题现象"><a href="#问题现象" class="headerlink" title="问题现象"></a>问题现象</h2><p>测试服务器上无日志打印。</p>
<h2 id="原因分析"><a href="#原因分析" class="headerlink" title="原因分析"></a>原因分析</h2><p>第一次遇到这种情况，构建成功，部署成功，然后打日志毫无反应。</p>
<p>于是我开始怀疑人生…可是不是解决办法呀！</p>
</summary>
</entry>
</feed>