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);

     }

 }