java 对xml的增删改查

<?xml version="1.0" encoding="UTF-8"?>
<root>
 <person id="1">
  <username >xiaoma</username>
  <password>xiaoma</password>
 </person>
 <person id="2">
  <username>manager</username>
  <password>password2</password>
 </person>
 <person id="3">
  <username>hello</username>
  <password>woerld</password>
 </person>
</root>
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package com.test;
import java.io.*;
import java.util.*;
import org.jdom.*;
import org.jdom.input.SAXBuilder;
import org.jdom.output.XMLOutputter;
/**
 * xml的增删改查之SAXBuilder
 *
 * @author Administrator
 *
 */
public class XmlTest {
 // 查询所有的数据
 public static void list() throws JDOMException, IOException {
  SAXBuilder builder = new SAXBuilder();
  String xmlPath = "message.xml";
  // String xmlPath = "./WebRoot/xml/message.xml";
  // 获得文档对象
  Document document = builder.build(xmlPath);
  // 获得根节点
  Element root = document.getRootElement();
  List list = root.getChildren();
  System.out.println("root : " + root);
  System.out.println("root.getName : " + root.getName());
  System.out.println("listSize : " + list.size());
  Iterator it = list.iterator();
  while (it.hasNext()) {
   Element e = (Element) it.next();
   System.out.println("ID: " + e.getAttributeValue("id"));
   System.out.println("childUsername:" + e.getChildText("username"));
   System.out.println("childPassword:" + e.getChildText("password"));
  }
  // for(int i=0;i<list.size();i++){
  // Element e = (Element)list.get(i