参考资料:
Dom4j 使用简介
作者：冰云 icecloud(AT)sina.com
http://blog.csdn.net/icecloud/archive/2003/12/17/7795.aspx

dom4j API和源码、例子下载网址:
http://sourceforge.net/project/showfiles.php?group_id=16035
下载dom4j-1.6.1.zip：带源码和例子。

一.dom4j解析xml
这部分内容之前已经写过，作为完整性，仅仅在此列出上次的代码：
package com.ict.shrd;

//import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.Attribute;
import java.util.List;
import java.util.Iterator;

import org.dom4j.dom.DOMDocument;
import org.dom4j.io.XMLWriter;
import java.io.*;
import org.dom4j.DocumentException;
import org.dom4j.io.SAXReader;

import java.io.*;
import java.util.*;
import org.dom4j.*;
import org.dom4j.io.*;

public class HjbhTableNameList{
 private String enName="";
 private String cnName="";
 private HashMap map=new HashMap();

 public String getEnName() {
  return enName;
 }
 public HashMap getTableListFromXml(File f){
  try{
   SAXReader reader = new SAXReader();
   Document doc = reader.read(f);
   Element root = doc.getRootElement();
   Element firstChild=root.element("hjbh");
   for (Iterator i = firstChild.elementIterator("tableName"); i.hasNext();) {
    Element foo = (Element) i.next();
    this.enName=foo.attributeValue("enName");
    this.cnName=foo.getText();
    map.put(enName,cnName);
   }
  } catch (Exception e) {
   e.printStackTrace();
      }
  return map;
 }

 public static void main(String arge[]) {
  File f = new File("E:\\jiangcm\\workspace-forict\\JavaBasis\\xml\\shrd.xml");
  HashMap map=new HashMap();
  HjbhTableNameList tableList=new HjbhTableNameList();
  map=tableList.getTableListFromXml(f);
  Set enNameSet=map.keySet();
  String enName="";
  for (Iterator i = enNameSet.iterator(); i.hasNext();) {
   enName=(String)i.next();
   //System.out.println(enName);
   System.out.println(map.get(enName));
  }
  
   
  }
}

二。dom4j生成xml树：
完整代码:
package xml;

import org.dom4j.*;
import java.io.*;

public class XmlCreator{
  public void createXML(String fileName) {

         Document doc = org.dom4j.DocumentHelper.createDocument();

         Element root = doc.addElement("book");

         root.addAttribute("name", "我的图书");

 

         Element childTmp;

         childTmp = root.addElement("price");

         childTmp.setText("21.22");

 

         Element writer = root.addElement("author");

         writer.setText("李四");

         writer.addAttribute("ID", "001");

 

         try {
             //注意这里使用的是FileOutputStream，而不是FileWriter,因为涉及到编码问题
             //详细见“dom4j编码问题解决”篇。

             org.dom4j.io.XMLWriter xmlWriter = new org.dom4j.io.XMLWriter(

                     new FileOutputStream(fileName));

             xmlWriter.write(doc);

             xmlWriter.close();

         }

         catch (Exception e) {

             System.out.println(e);

         }

     }
  public static void main(String[] args){
   XmlCreator xmlCreator=new XmlCreator();
   xmlCreator.createXML("E:\\jiangcm\\book.xml");
  }
}