Dom4j修改文件

package com.beckham.dom;
import java.io.File;
import java.io.FileWriter;
import java.util.List;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
/**
 * @author 作者<Beckham> Email:[e-mail] Jan 29, 2010 10:16:55 AM
 *         Version:1.0 修改XML文件
 */
public class ModifyXML {
	public static void main(String[] args)throws Exception {
		createFile("src/com/beckham/dom/student.xml") ;
	}
	public static void createFile(String fileName) throws Exception {
		Document document = DocumentHelper.createDocument();
		Element root = document.addElement("students");
		Element stuEle = root.addElement("student");
		stuEle.addAttribute("id", "001");
		Element nameEle = stuEle.addElement("name");
		nameEle.setText("张三");
		Element ageEle = stuEle.addElement("age");
		ageEle.setText("20");
		
		witerXMLFile(document,fileName) ;
	}
	
	public static void modifyFile(String fileName) throws Exception{
		SAXReader sax = new SAXReader() ;
		Document document = sax.read(new File(fileName)) ;
		
		//修改
		List<Attribute> list = document.selectNodes("students/student/@id") ;
		for(Attribute a :list){
			if(a.getText().equals("001")){
				a.setText("007") ;
			}
		}
		
		witerXMLFile(document,fileName) ;
	}
	
	public static void deleteFile(String fileName) throws Exception{
		SAXReader sax = new SAXReader() ;
		Document document = sax.read(new File(fileName)) ;
		
		//删除节点
		List<Element> list = document.selectNodes("students/student") ;
		for(Element e :list){
			Attribute a = e.attribute(0) ;
			if(a.getText().equals("007")){
				e.remove(a) ;
			}
		}
		
		witerXMLFile(document,fileName) ;
	}
	
	//写文件
	public static void witerXMLFile(Document document,String fileName)throws Exception{
		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" encoding="GBK"?>
<students>
  <student id="001">
    <name>张三</name>
    <age>20</age>
  </student>
</students>