Dom4j操作XML文件 写文件

package com.beckham.dom;
import java.io.File;
import java.io.FileWriter;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.XMLWriter;
/**
* @author 作者<Beckham>
* Email:gaowm0207@gmail.com
* Jan 28, 2010 10:03:12 AM
* DOM4j写XML文件
*/
public class CreateXMLFile {
public static void main(String[] args)throws Exception {
createFile("src/com/beckham/dom/application.xml") ;
}

public static void createFile(String fileName) throws Exception{

Document document = DocumentHelper.createDocument() ;
//根节点
Element root = document.addElement("beans") ;
//根节点注释
root.addComment("这是根节点") ;

//第一个子节点
Element elementBean1 = root.addElement("bean") ;
elementBean1.addAttribute("id", "boy") ;
elementBean1.addAttribute("class", "com.beckham.spring.Boy") ;
Element elementProp = elementBean1.addElement("property") ;
elementProp.addAttribute("name", "user") ;
elementProp.addAttribute("ref", "com.beckham.User") ;

//第二个子节点
Element elementBean2 = root.addElement("bean") ;
elementBean2.addAttribute("id", "girl") ;
elementBean2.addAttribute("class", "com.beckham.spring.Girl") ;
Element elementProp2 = elementBean2.addElement("property") ;
elementProp2.addAttribute("name", "user") ;
elementProp2.addAttribute("ref", "com.beckham.User") ;

//前一个参数表示缩进4个空格
OutputFormat format = new OutputFormat(" ",true) ;

format.setEncoding("GBK") ;
XMLWriter w = new XMLWriter(new FileWriter(new File(fileName)),format ) ;


w.write(document) ;
w.close() ;
}

} 
<?xml version="1.0&qu