DOM生成XML文档与解析XML文档(JUNIT测试)

 1 package cn.liuning.test;
 2 
 3 import java.io.File;
 4 import java.io.IOException;
 5 
 6 import javax.xml.parsers.DocumentBuilder;
 7 import javax.xml.parsers.DocumentBuilderFactory;
 8 import javax.xml.parsers.ParserConfigurationException;
 9 import javax.xml.transform.Result;
10 import javax.xml.transform.Source;
11 import javax.xml.transform.Transformer;
12 import javax.xml.transform.TransformerException;
13 import javax.xml.transform.TransformerFactory;
14 import javax.xml.transform.dom.DOMSource;
15 import javax.xml.transform.stream.StreamResult;
16 
17 import org.junit.Test;
18 import org.w3c.dom.Document;
19 import org.w3c.dom.Element;
20 import org.w3c.dom.Node;
21 import org.w3c.dom.NodeList;
22 
23 public class Demo1
24 {
25     
26     @Test//dom生成XML文档
27     public void createdXmlbyDom() throws ParserConfigurationException, TransformerException
28     {
29          DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();  
30          DocumentBuilder builder = factory.newDocumentBuilder(); 
31          Document document = builder.newDocument();
32          //加入根结点
33          Element rootElement = document.createElement("xml");  
34          //新建子结点
35          Element toUserName = document.createElement("ToUserName"); 
36          //设置属性
37          toUserName.setAttribute("id", "id_1");
38          //设置内容
39          String str = "<![CDATA[gh_1c586f95bd68]]>"; 
40          toUserName.setTextContent(str);
41          Element fromUserName = document.createElement("FromUserName");
42          fromUserName.setAttribute("id", "id_2");
43          String str1 = "<![CDATA[ogNtkuMTj4uOx-DCvLfu8mUDmubM]]>"; 
44          fromUserName.setTextContent(str1);
45 
46          Element createTime = document.createElement("CreateTime");
47          createTime.setAttribute("id", "id_2");
48          String str2 = "1403313142"; 
49          createTime.setTextContent(str2);
50          
51          Element createTime1 = document.createElement("CreateTime");
52          createTime1.setAttribute("id", "id_2");
53          String str3 = "Test"; 
54          createTime1.setTextContent(str3);
55          
56          rootElement.appendChild(toUserName);
57          rootElement.appendChild(fromUserName);
58          rootElement.appendChild(createTime);
59          rootElement.appendChild(createTime1);
60          
61          document.appendChild(rootElement); 
62          
63          TransformerFactory transformerFactory = TransformerFactory.newInstance();
64          Transformer transformer = transformerFactory.newTransformer();
65          Source xmlSource = new DOMSource(document);
66 
67          Result outputTarget = new StreamResult(new File("src/book1.xml"));  
68          transformer.transform(xmlSource, outputTarget);
69          System.out.println("成功");
70     }
71     @Test//dom解析XML文档
72     public void read() throws ParserConfigurationException, Exception, IOException
73     {
74         //1.新建工厂        
75         DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
76         //2.得到dom解析器
77         DocumentBuilder builder = factory.newDocumentBuilder();
78         //3.得到代表文档的document上
79         Document document =  builder.parse("src/book1.xml");    
80 
81         System.out.println(document.getInputEncoding());//得到文档编码
82     
83         //通过标签名获取标签，得到的是一个list集合
84         //NodeList list = document.getElementsByTagName("CreateTime");
85         NodeList list = document.getElementsByTagName("xml");
86         
87         //常用方法
88         System.out.println(list.getLength());//可以输出list的长度
89         Node node = list.item(0); //得到第几个结点
90         
91         //node方法
92         System.out.println(node.getNodeName());//得到结点名称，输出CreateTime
93         System.out.println(node.hasAttributes());//是否有属性，输出true
94         System.out.println(node.hasChildNodes());//是否有孩子，输出true
95         String content = node.getTextContent();//获取结点内容
96         System.out.println(content);
97 
98     }
99 }