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<!DOCTYPE html><html lang="zh-CN"><head><meta name="generator" content="Hexo 3.9.0"><meta http-equiv="content-type" content="text/html; charset=utf-8"><meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0" name="viewport"><meta content="yes" name="apple-mobile-web-app-capable"><meta content="black-translucent" name="apple-mobile-web-app-status-bar-style"><meta content="telephone=no" name="format-detection"><meta name="description" content="欢迎来到晋的博客,本博客用来收录平时学习笔记,欢迎访问"><title>jaxp解析XML | ZJ_BLOG</title><link rel="stylesheet" type="text/css" href="/css/style.css?v=0.0.1"><link rel="stylesheet" type="text/css" href="//cdn.bootcss.com/normalize/7.0.0/normalize.min.css"><link rel="stylesheet" type="text/css" href="//cdn.bootcss.com/pure/1.0.0/pure-min.css"><link rel="stylesheet" type="text/css" href="//cdn.bootcss.com/pure/1.0.0/grids-responsive-min.css"><link rel="stylesheet" href="//cdn.bootcss.com/font-awesome/4.7.0/css/font-awesome.min.css"><script type="text/javascript" src="//cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script><link rel="Shortcut Icon" type="image/x-icon" href="/favicon.ico"><link rel="apple-touch-icon" href="/apple-touch-icon.png"><link rel="apple-touch-icon-precomposed" href="/apple-touch-icon.png"><script type="text/javascript" src="http://p18j2ow6f.bkt.clouddn.com/static/css/instantclick.min.js"></script><script>InstantClick.init();
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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">jaxp解析XML</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">jaxp解析XML</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"><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><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> cn.utils;</span><br><span class="line"><span class="comment">//包名</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.io.FileOutputStream;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> javax.xml.crypto.dsig.Transform;</span><br><span class="line"><span class="keyword">import</span> javax.xml.parsers.DocumentBuilder;</span><br><span class="line"><span class="keyword">import</span> javax.xml.parsers.DocumentBuilderFactory;</span><br><span class="line"><span class="keyword">import</span> javax.xml.parsers.ParserConfigurationException;</span><br><span class="line"><span class="keyword">import</span> javax.xml.transform.Transformer;</span><br><span class="line"><span class="keyword">import</span> javax.xml.transform.TransformerConfigurationException;</span><br><span class="line"><span class="keyword">import</span> javax.xml.transform.TransformerFactory;</span><br><span class="line"><span class="keyword">import</span> javax.xml.transform.dom.DOMSource;</span><br><span class="line"><span class="keyword">import</span> javax.xml.transform.stream.StreamResult;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.w3c.dom.Document;</span><br><span class="line"></span><br><span class="line"><span class="comment">//工具类 执行那些重复的代码块 默认为静态</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">XmlUtils</span> </span>{</span><br><span class="line"> <span class="keyword">private</span> <span class="keyword">static</span> String filename = <span class="string">"src/exam.xml"</span>;</span><br><span class="line"></span><br><span class="line"> <span class="comment">//得到解析器并解析xml文档</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> Document <span class="title">getDocument</span><span class="params">()</span> <span class="keyword">throws</span> Exception</span>{</span><br><span class="line"> <span class="comment">//1.创建工厂(得到DOM解析器的工厂实例) ---这个工厂类是抽象类,so用其newInstance方法得到DOM的新实例</span></span><br><span class="line"> DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();</span><br><span class="line"> <span class="comment">//2.从DOM工厂获得DOM解析器 有了这个实例才可以解析</span></span><br><span class="line"> DocumentBuilder builder = factory.newDocumentBuilder();</span><br><span class="line"> <span class="comment">//3.将给定URI的内容解析为一个XML文档,并且返回一个新的DOM Document对象</span></span><br><span class="line"> Document document = builder.parse(<span class="string">"src/cn/xml/book.xml"</span>);</span><br><span class="line"> <span class="comment">//4.以后的处理都是对Document对象进行的</span></span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> document;</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="comment">//把得到的数据写入xml文档</span></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">write2Xml</span><span class="params">(Document document)</span> <span class="keyword">throws</span> Exception</span>{</span><br><span class="line"> TransformerFactory factory = TransformerFactory.newInstance();<span class="comment">//产生转化器</span></span><br><span class="line"> Transformer tf = factory.newTransformer();</span><br><span class="line"> tf.transform(<span class="keyword">new</span> DOMSource(document), <span class="keyword">new</span> StreamResult(<span class="keyword">new</span> FileOutputStream(filename)));</span><br><span class="line"></span><br><span class="line"> <span class="comment">//原理</span></span><br><span class="line"> <span class="comment">/*</span></span><br><span class="line"><span class="comment"> //创建工厂实例</span></span><br><span class="line"><span class="comment"> TransformerFactory tf = TransformerFactory.newInstance();</span></span><br><span class="line"><span class="comment"> //通过工厂实例得到Transformer对象(transform方法可以转化来源到目的地)</span></span><br><span class="line"><span class="comment"> Transformer tr = tf.newTransformer();</span></span><br><span class="line"><span class="comment"> //DOMSource是Source的实现类 把Document类型封装为Source类型</span></span><br><span class="line"><span class="comment"> Source s = new DOMSource(document);</span></span><br><span class="line"><span class="comment"> //声明输出流对象 指向硬盘中的XML文件</span></span><br><span class="line"><span class="comment"> OutputStream f= new FileOutputStream("src/cn/xml/book.xml");</span></span><br><span class="line"><span class="comment"> //把输出流对象通过流方法转化为Result对象 Result对象指向硬盘中的XML文件</span></span><br><span class="line"><span class="comment"> Result r = new StreamResult(f);</span></span><br><span class="line"><span class="comment"> //transform方法(来源, 目的地) 把s写入r</span></span><br><span class="line"><span class="comment"> tr.transform(s, r);</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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