使用dom4j操作XML

　　DOM4J介绍

　　DOM4J是使用Java语言编写的，用于读写及操作XML的一套组件，DOM4J同时具有DOM修改文件的优点和SAX读取快速的优点。 

　　DOM4J的使用

　　首先下载dom4j的JAR包，我用的版本是1.6.1，下载地址：http://download.csdn.net/detail/onroads/9721574

　　使用方法《使用JDOM操作XML》，链接：http://www.cnblogs.com/centor/p/6215082.html

　　另外，解压后用到dom4j01.6.1.jar文件，还有一个lib/jaxen-1.1-beta-6.jar文件，一般也需要引入，否则执行时可能抛出java.lang.NoClassDefFoundError:org/jaxen/JaxenException异常。DOM4J的主要接口如下：

　　使用DOM4J

 　　生成xml例程：

package com.xml;

import java.io.File;
import java.io.FileOutputStream;

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.XMLWriter;


public class XMLtest {

    public static void main(String args[]) throws Exception {

        String[] names = {"鸣人","佐助","小樱"};
        String[] emails = {"mingren@163.com","zuozhu@163.com","xiaoying@163.com"};
        String[] ids ={"H1","H2","H3"};
        
        Document doc = DocumentHelper.createDocument();
        Element addresslist = doc.addElement("addresslist");    
        
        for (int i = 0; i < 3; i++) {
            Element linkman = addresslist.addElement("linkman");
            Element name = linkman.addElement("name");
            Element email = linkman.addElement("email");
            name.setText(names[i]);
            email.setText(emails[i]);
            name.setAttributeValue("id", ids[i]);    
        }
        
        OutputFormat format = OutputFormat.createPrettyPrint();
        format.setEncoding("GBK");
        try {
            XMLWriter xmlWriter = new XMLWriter(new FileOutputStream("D:"+File.separator+"person.xml"), format);
            xmlWriter.write(doc);
            xmlWriter.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

　　生成的xml文件：

　　

解析XML文件：

package com.xml;

import java.io.File;
import java.util.Iterator;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class XMLtest {

    public static void main(String args[]) throws Exception {

        File file = new File("D:"+File.separator+"person.xml");
        SAXReader reader = new SAXReader();
        Document doc = null;
        try {
            doc = reader.read(file);
            
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        Element root = doc.getRootElement();
        Iterator iterator = root.elementIterator();
        while(iterator.hasNext()){
            System.out.println("<linkman>");
            Element linkman = (Element) iterator.next();
            System.out.println("  <name id="+ linkman.element("name").attributeValue("id")+">"+linkman.elementText("name")+"</name>");
            System.out.println("  <email>"+linkman.elementText("email")+"</email>");
            System.out.println("</linkman>");
        }
    }
}

解析结果：