DOM生成XML文档与解析XML文档(JUNIT测试)

 package cn.liuning.test;

 import java.io.File;
 import java.io.IOException;

 import javax.xml.parsers.DocumentBuilder;
 import javax.xml.parsers.DocumentBuilderFactory;
 import javax.xml.parsers.ParserConfigurationException;
 import javax.xml.transform.Result;
 import javax.xml.transform.Source;
 import javax.xml.transform.Transformer;
 import javax.xml.transform.TransformerException;
 import javax.xml.transform.TransformerFactory;
 import javax.xml.transform.dom.DOMSource;
 import javax.xml.transform.stream.StreamResult;

 import org.junit.Test;
 import org.w3c.dom.Document;
 import org.w3c.dom.Element;
 import org.w3c.dom.Node;
 import org.w3c.dom.NodeList;

 public class Demo1
 {

     @Test//dom生成XML文档
     public void createdXmlbyDom() throws ParserConfigurationException, TransformerException
     {
          DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
          DocumentBuilder builder = factory.newDocumentBuilder();
          Document document = builder.newDocument();
          //加入根结点
          Element rootElement = document.createElement("xml");
          //新建子结点
          Element toUserName = document.createElement("ToUserName");
          //设置属性
          toUserName.setAttribute("id", "id_1");
          //设置内容
          String str = "<![CDATA[gh_1c586f95bd68]]>";
          toUserName.setTextContent(str);
          Element fromUserName = document.createElement("FromUserName");
          fromUserName.setAttribute("id", "id_2");
          String str1 = "<![CDATA[ogNtkuMTj4uOx-DCvLfu8mUDmubM]]>";
          fromUserName.setTextContent(str1);

          Element createTime = document.createElement("CreateTime");
          createTime.setAttribute("id", "id_2");
          String str2 = "1403313142";
          createTime.setTextContent(str2);

          Element createTime1 = document.createElement("CreateTime");
          createTime1.setAttribute("id", "id_2");
          String str3 = "Test";
          createTime1.setTextContent(str3);

          rootElement.appendChild(toUserName);
          rootElement.appendChild(fromUserName);
          rootElement.appendChild(createTime);
          rootElement.appendChild(createTime1);

          document.appendChild(rootElement); 

          TransformerFactory transformerFactory = TransformerFactory.newInstance();
          Transformer transformer = transformerFactory.newTransformer();
          Source xmlSource = new DOMSource(document);

          Result outputTarget = new StreamResult(new File("src/book1.xml"));
          transformer.transform(xmlSource, outputTarget);
          System.out.println("成功");
     }
     @Test//dom解析XML文档
     public void read() throws ParserConfigurationException, Exception, IOException
     {
         //1.新建工厂
         DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
         //2.得到dom解析器
         DocumentBuilder builder = factory.newDocumentBuilder();
         //3.得到代表文档的document上
         Document document =  builder.parse("src/book1.xml");    

         System.out.println(document.getInputEncoding());//得到文档编码

         //通过标签名获取标签，得到的是一个list集合
         //NodeList list = document.getElementsByTagName("CreateTime");
         NodeList list = document.getElementsByTagName("xml");

         //常用方法
         System.out.println(list.getLength());//可以输出list的长度
         Node node = list.item(0); //得到第几个结点

         //node方法
         System.out.println(node.getNodeName());//得到结点名称，输出CreateTime
         System.out.println(node.hasAttributes());//是否有属性，输出true
         System.out.println(node.hasChildNodes());//是否有孩子，输出true
         String content = node.getTextContent();//获取结点内容
         System.out.println(content);

     }
 }