java学习：使用dom4j读写xml文件

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <address-list>
 3   <card name="yangjm" id="1">
 4     <sex>男</sex>
 5     <address><![CDATA[中国上海外滩No.01]]>    </address>
 6     <telephone>13916732212</telephone>
 7   </card>
 8   <card name="zhangsan" id="2">
 9     <sex>女</sex>
10     <address>
11       <item type="家庭地址"><![CDATA[中国.北京.东直门外大街]]>      </item>
12       <item type="单位地址"><![CDATA[中国.上海.田林路888号]]>      </item>
13     </address>
14     <telephone>010-123123</telephone>
15   </card>
16 </address-list>

 1 package jmyang.dom4j;
 2 
 3 /**
 4  * <p>Title:dom4j测试 </p>
 5  * <p>Description: 使用xpath读取节点内容、属性</p>
 6  * <p>Copyright: Copyright (c) 2012</p>
 7  * <p>Company: infosky.com.cn</p>
 8  * @author:yjmyzz@126.com 菩提树下的杨过
 9  * @version 1.0
10  */
11 
12 import java.util.*;
13 import java.io.*;
14 import org.dom4j.*;
15 import org.dom4j.io.*;
16 
17 
18 public class XmlTest {
19 
20 
21     public static void Test() {
22         String fileName = System.getProperty("user.dir") + "\\demo.xml"; //当前路径下的demo.xml
23 
24         try {
25             SAXReader reader = new SAXReader();
26             Document doc = reader.read(fileName); //加载xml文件
27 
28             List peoples = doc.selectNodes("//*[@name]"); //选择所有具有name属性的节点(即demo.xml中的所有card节点)
29             for (Iterator iter = peoples.iterator(); iter.hasNext(); ) {
30                 Element card = (Element) iter.next();
31                 //System.out.println(node.asXML());
32                 //System.out.println("---------------------------------------");
33                 //System.out.println(node.attributeCount());
34                 List attrList = card.attributes();
35                 //输出每个card的所有属性
36                 for (Iterator attr = attrList.iterator(); attr.hasNext(); ) {
37                     Attribute a = (Attribute) attr.next();
38                     System.out.println(a.getName() + "=" + a.getValue());
39 
40                 }
41                 System.out.println(
42                         "----------------------------------------------------");
43             }
44 
45             Element zhangsan = (Element) doc.selectSingleNode("//card[@id='2']"); //查找“id属性”=2的card元素
46             System.out.println("张三的名称：" + zhangsan.attribute("name").getValue()); //输出zhangsan的name属性
47 
48             Node addrFamily = zhangsan.selectSingleNode("./address/item[2]"); //选择zhangsan元素下的address节点下的第2个item子节点
49             System.out.println("张三的单位地址：" + addrFamily.getStringValue()); //输出cdata内容
50 
51             System.out.println(
52                     "----------------------------------------------------");
53             //为zhangsan下增加二个节点
54             zhangsan.addElement("email").addAttribute("type",
55                     "工作").addText("work@some-domain.com");
56             zhangsan.addElement("email").addAttribute("type",
57                     "私人").addCDATA("private@some-domain.com"); //设置CDATA内容
58 
59             System.out.println(zhangsan.asXML()); //打印zhangsan节点的xml内容(调试用)
60             System.out.println(
61                     "----------------------------------------------------");
62 
63             //将上述改动保存到文件demo2.xml
64             FileWriter fileWriter = new FileWriter(System.getProperty(
65                     "user.dir") + "\\demo2.xml");
66 
67             OutputFormat format = OutputFormat.createPrettyPrint(); //设置美观的缩进格式，便于阅读
68             //format = OutputFormat.createCompactFormat();//设置紧凑格式（消除多余空格），便于下载
69             XMLWriter writer = new XMLWriter(System.out, format);
70             writer.setWriter(fileWriter);
71             writer.write(doc);
72             writer.close();
73 
74         } catch (Exception e) {
75             e.printStackTrace();
76         }
77 
78     }
79 }