xml 生成，解析

studentInfo.xml

<?xml version="1.0" encoding="gb2312"?>
<students>
<student age="25"><!--如果没有age属性，默认的为20-->
<name>崔卫兵</name>
<college>PC学院</college>
<telephone>62354666</telephone>
<notes>男,1982年生,硕士，现就读于北京邮电大学</notes>
</student>

<student>
<name>cwb</name>
<college leader="学院领导">PC学院</college><!--如果没有leader属性，默认的为leader-->
<telephone>62358888</telephone>
<notes>男,1987年生,硕士，现就读于中国农业大学</notes>
</student>
<student age="45">
<name>xxxxx</name>
<college leader="">xxx学院</college>
<telephone>66666666</telephone>
<notes>注视中，注释中</notes>
</student>
<student age="">
<name>lxx</name>
<college>yyyy学院</college>
<telephone>88888888</telephone>
<notes>注视中111，注释中222</notes>
</student>
</students>

Dom4jReadExmple.java

package dom4jExample.read;

import java.io.File;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
/**
* 利用dom4j与XPath进行XML编程
* @author cuiweibing
* @since 2007.8.10
*/
public class Dom4jReadExmple {
/**
* 利用XPath操作XML文件，获取指定节点或者属性的值，并放入HashMap中
* @param filename String 待操作的XML文件（相对路径或者绝对路径）
* @param hm HashMap 存放选择的结果，格式：<nodename,nodevalue>或者<nodename+attrname,attrvalue>
*/
public void getSelectedNodeValue(String filename,HashMap<String,String> hm){
try {
SAXReader saxReader = new SAXReader();
Document document = saxReader.read(new File(filename));
//获取学生姓名为"崔卫兵"的年龄
List list = document.selectNodes("/students/student[name="崔卫兵"]/@age");
Iterator iter = list.iterator();
if (iter.hasNext()) {
Attribute attribute = (Attribute) iter.next();
hm.put("崔卫兵-"+attribute.getName(),attribute.getValue());
}else{
hm.put("崔卫兵-age","20");
}

//获取学生姓名为"崔卫兵"的年龄
list = document.selectNodes("/students/student[name="cwb"]/@age");
iter = list.iterator();
if (iter.hasNext()) {
Attribute attribute = (Attribute) iter.next();
hm.put("cwb-"+attribute.getName(),attribute.getValue());
}else{
hm.put("cwb-age","20");
}

//获取学生姓名为"cwb"所在的学院名称
list = document.selectNodes("/students/student[name="cwb"]/college");
iter = list.iterator();
if (iter.hasNext()) {
Element element = (Element) iter.next();
String name = element.getName();
String value = element.getText();
hm.put("cwb-"+name,value);
}

//获取学生姓名为"cwb"所在学院的领导
list = document.selectNodes("/students/student[name="cwb"]/college/@leader");
iter = list.iterator();
if (iter.hasNext()) {
Attribute attribute = (Attribute) iter.next();
hm.put("cwb-college-"+attribute.getName(),attribute.getValue());
}else{
hm.put("cwb-college-leader","leader");
}

//获取学生姓名为"lxx"所在的学院名称
list = document.selectNodes("/students/student[name="lxx"]/college");
iter = list.iterator();
if (iter.hasNext()) {
Element element = (Element) iter.next();
String name = element.getName();
String value = element.getText();
hm.put("lxx-"+name,value);
}

//获取学生姓名为"lxx"所在学院的领导
list = document.selectNodes("/students/student[name="lxx"]/college/@leader");
iter = list.iterator();
if (iter.hasNext()) {
Attribute attribute = (Attribute) iter.next();
hm.put("lxx-college-"+attribute.getName(),attribute.getValue());
}else{
hm.put("lxx-college-leader","leader");
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
}

TestDom4jReadExmple.java

package dom4jExample.read;

import java.util.HashMap;

/**
* 测试Dom4jReadExmple解析的情况
* @author cuiweibing
* @since 2007.8.10
*/
public class TestDom4jReadExmple {
public static void main(String[] args) {
try{
//获取解析完后的解析信息
HashMap<String,String> hashMap;
Dom4jReadExmple drb=new Dom4jReadExmple();
//利用XPath操作XML文件，获取想要的属性值
hashMap = new HashMap<String,String>();
drb.getSelectedNodeValue("studentInfo.xml",hashMap);
System.out.println("崔卫兵-age:"+hashMap.get("崔卫兵-age"));
System.out.println("cwb-age:"+hashMap.get("cwb-age"));
System.out.println("cwb-college:"+hashMap.get("cwb-college"));
System.out.println("cwb-college-leader:"+hashMap.get("cwb-college-leader"));
System.out.println("lxx-college:"+hashMap.get("lxx-college"));
System.out.println("lxx-college-leader:"+hashMap.get("lxx-college-leader"));
}catch(Exception ex){
ex.printStackTrace();
}
}
}

运行结果

崔卫兵-age:25 cwb-age:20 cwb-college:PC学院 cwb-college-leader:学院领导 lxx-college:yyyy学院 lxx-college-leader:leader