​Dom4j是一个易用的、开源的库，用于XML，XPath和XSLT。它应用于Java平台，采用了Java集合框架并完全支持DOM，SAX和JAXP。很多Java软件读写XML都在使用dom4j，Sun公司的JAXM也是用dom4j。Hibernate用它来读写配置文件。

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        DOM4J解析xml文档实例

package cn.iborder.xml;import java.io.File;import java.util.Iterator;import java.util.List;import java.util.Scanner;import org.dom4j.Attribute;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.SAXReader;public class Dom4jParseXml {		//指定xml文件作为解析对象	public File getXmlFile() {		Scanner scanner = new Scanner(System.in);		System.out.println("请输入要解析的xml文件名:");		String filename = scanner.nextLine();		//System.getProperty("user.dir") 获取项目路径		File file = new File(System.getProperty("user.dir")+"\\src\\"+filename);		return file;	}		//将xml文件转换为Document对象	public Document xmlToDocument(File file) {		SAXReader saxReader = new SAXReader();		Document document = null;		try {			document = saxReader.read(file);		} catch (DocumentException e) {			// TODO Auto-generated catch block			System.out.println("Xml to Document转换失败...");			System.out.println(e.getMessage());		}		return document;	}		//解析文档	public void parseDocument(Document document) {		//获取根节点		Element rootElement = document.getRootElement();		System.out.println("根节点 : "+rootElement.getName());		//遍历输出 		//第一种方法		System.out.println("第一种遍历输出方法");		for (Iterator iterator = rootElement.elementIterator(); iterator.hasNext();) {			Element childElement1 = (Element) iterator.next();			Attribute attribute = childElement1.attribute("id");			System.out.println("id = " + attribute.getText());						for (Iterator iter = childElement1.elementIterator(); iter.hasNext();) {				Element childElement2 = (Element) iter.next();				System.out.println(childElement2.getName() + " = " + childElement2.getText());			}		}				System.out.println("====================");		//第二种方法		System.out.println("第二种遍历输出方法");		List
    
      listElement1 = rootElement.elements();		for (Element element1 : listElement1) {			Attribute attribute = element1.attribute("id");			System.out.println(attribute.getName()+" = "+attribute.getText());			List
     
       listElement2 = element1.elements();			for (Element element2 : listElement2) {				System.out.println(element2.getName()+" = "+element2.getText());			}		}	}	public static void main(String[] args) {		// TODO Auto-generated method stub		Dom4jParseXml dom4jParseXml = new Dom4jParseXml();		File file = dom4jParseXml.getXmlFile();		Document document = dom4jParseXml.xmlToDocument(file);		dom4jParseXml.parseDocument(document);	}}
     
    

        DOM4J创建xml文档实例

import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.UnsupportedEncodingException;import org.dom4j.Document;import org.dom4j.DocumentHelper;import org.dom4j.Element;import org.dom4j.io.OutputFormat;import org.dom4j.io.XMLWriter;public class Dom4JCreateXml {	public static void main(String[] args) {		// TODO Auto-generated method stub		//创建document对象,根节点为class		Element rootElement = DocumentHelper.createElement("class");		Document document = DocumentHelper.createDocument(rootElement);				//添加两个一级子节点		Element childElement11 = rootElement.addElement("student");		Element childElement12 = rootElement.addElement("student");				//为一级子节点添加属性		childElement11.addAttribute("uid", "10086");		childElement12.addAttribute("uid", "10010");				//添加二级子节点		childElement11.addElement("stuName").setText("李彦宏");		childElement11.addElement("stuAge").setText("12");		childElement12.addElement("stuName").setText("马化腾");		childElement12.addElement("stuAge").setText("15");				//输出生成xml文件		OutputFormat format = new OutputFormat("    ", true);// 设置缩进为4个空格，并且另起一行为true        try {				XMLWriter xmlWriter = new XMLWriter(new FileOutputStream("src/student.xml"), format);			xmlWriter.write(document);		} catch (UnsupportedEncodingException e) {			// TODO Auto-generated catch block			System.out.println(e.getMessage());		} catch (FileNotFoundException e) {			// TODO Auto-generated catch block			System.out.println(e.getMessage());		} catch (IOException e) {			// TODO Auto-generated catch block			System.out.println(e.getMessage());		}	}}