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</script><link rel="alternate" type="application/atom+xml" href="/atom.xml"></head><body><div class="body_container"><div id="header"><div class="site-name"><h1 class="hidden">XPath解析xml文档</h1><a id="logo" href="/.">ZJ_BLOG</a><p class="description">Silence的博客</p></div><div id="nav-menu"><a class="current" href="/."><i class="fa fa-home"> 首页</i></a><a href="/archives/"><i class="fa fa-archive"> 归档</i></a></div></div><div class="pure-g" id="layout"><div class="pure-u-1 pure-u-md-3-4"><div class="content_container"><div class="post"><h1 class="post-title">XPath解析xml文档</h1><div class="post-meta">Feb 5, 2017<span> | </span><span class="category"><a href="/categories/DOM操作/">DOM操作</a><a href="/categories/DOM操作/XML/">XML</a></span></div><div class="post-content"><a id="more"></a>
<p><strong>这是被解析的xml文档示例</strong><br><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta"><?xml version="1.0" encoding="UTF-8" standalone="no"?></span></span><br><span class="line"><span class="tag"><<span class="name">用户</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">user</span> <span class="attr">id</span>=<span class="string">"1"</span> <span class="attr">username</span>=<span class="string">"aaa"</span> <span class="attr">password</span>=<span class="string">"123"</span> <span class="attr">email</span>=<span class="string">"abc.com"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">user</span> <span class="attr">id</span>=<span class="string">"2"</span> <span class="attr">username</span>=<span class="string">"bbb"</span> <span class="attr">password</span>=<span class="string">"123"</span> <span class="attr">email</span>=<span class="string">"abc.com"</span>/></span></span><br><span class="line"> <span class="tag"><<span class="name">书架</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">书</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">书名</span>></span>java实战<span class="tag"></<span class="name">书名</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">作者</span>></span>张三<span class="tag"></<span class="name">作者</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">售价</span>></span>121元<span class="tag"></<span class="name">售价</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">售价</span>></span>12元<span class="tag"></<span class="name">售价</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">书</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">书</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">书名</span> <span class="attr">color</span>=<span class="string">"yellow"</span> <span class="attr">name</span>=<span class="string">"XXX"</span>></span>c测试<span class="tag"></<span class="name">书名</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">作者</span>></span>李四<span class="tag"></<span class="name">作者</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">售价</span> <span class="attr">color</span>=<span class="string">"rrr"</span>></span>54元<span class="tag"></<span class="name">售价</span>></span></span><br><span class="line"> <span class="tag"><<span class="name">售价</span>></span>12元<span class="tag"></<span class="name">售价</span>></span><span class="tag"></<span class="name">书</span>></span></span><br><span class="line"> <span class="tag"></<span class="name">书架</span>></span></span><br><span class="line"><span class="tag"></<span class="name">用户</span>></span></span><br></pre></td></tr></table></figure></p>
<hr>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> cn.xml;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.io.File;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.dom4j.Document;</span><br><span class="line"><span class="keyword">import</span> org.dom4j.DocumentException;</span><br><span class="line"><span class="keyword">import</span> org.dom4j.Node;</span><br><span class="line"><span class="keyword">import</span> org.dom4j.io.SAXReader;</span><br><span class="line"><span class="keyword">import</span> org.junit.Test;</span><br><span class="line"></span><br><span class="line"><span class="comment">//用XPath提取xml文档数据</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Xpath</span></span>{</span><br><span class="line"> <span class="meta">@Test</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">read</span><span class="params">()</span> <span class="keyword">throws</span> DocumentException </span>{</span><br><span class="line"> SAXReader reader = <span class="keyword">new</span> SAXReader();<span class="comment">//解析器</span></span><br><span class="line"> Document document = reader.read(<span class="keyword">new</span> File(<span class="string">"src/book.xml"</span>));<span class="comment">//解析</span></span><br><span class="line"></span><br><span class="line"> String s = document.selectSingleNode(<span class="string">"//作者"</span>).getText();<span class="comment">//得到第一个作者的内容</span></span><br><span class="line"> <span class="comment">//selectSingleNode是取第一个"作者"节点 要取所有则用selectNodes</span></span><br><span class="line"> System.out.println(s);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="meta">@Test</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">find</span><span class="params">()</span> <span class="keyword">throws</span> DocumentException </span>{<span class="comment">//检测xml文档中有没有相匹配的用户账号密码</span></span><br><span class="line"> String username = <span class="string">"aaa"</span>;</span><br><span class="line"> String password = <span class="string">"123"</span>;</span><br><span class="line"></span><br><span class="line"> SAXReader reader = <span class="keyword">new</span> SAXReader();<span class="comment">//解析器</span></span><br><span class="line"> Document document = reader.read(<span class="keyword">new</span> File(<span class="string">"src/book.xml"</span>));<span class="comment">//解析</span></span><br><span class="line"></span><br><span class="line"> <span class="comment">//选择含有属性username且其值为'aa'的user元素( 这里注意空格有无是不同的)</span></span><br><span class="line"> Node node = document.selectSingleNode(<span class="string">"//user[@username= '"</span> + username + <span class="string">"' and @password= '"</span> + password + <span class="string">"' ]"</span>);</span><br><span class="line"> <span class="keyword">if</span> (node == <span class="keyword">null</span>) {</span><br><span class="line"> System.out.println(<span class="string">"用户名/密码错误"</span>);</span><br><span class="line"> }<span class="keyword">else</span>{</span><br><span class="line"> System.out.println(<span class="string">"登陆成功"</span>);</span><br><span class="line"> }</span><br><span class="line"> 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