java用dom4j操作XML

import java.io.FileWriter;

import java.io.IOException;

import java.util.Iterator;

import org.dom4j.*;

import org.dom4j.io.OutputFormat;

import org.dom4j.io.SAXReader;

import org.dom4j.io.XMLWriter;

public class Dom4jDmeo {

    static void readXML(String path){

       SAXReader reader=new SAXReader();//构建sax读取对象

       try {

           Document doc=reader.read(path);//获取文档对象

           Element root=doc.getRootElement();//获取根节点

           System.out.println("根节点:"+root.getName());

           Iterator it=root.elementIterator();//获取根节点下面的所有子节点

           while(it.hasNext()){

              Element el=(Element) it.next();//遍历出根节点下面的单个节点

              System.out.println(el.elementText("NO"));

              System.out.println(el.element("NO").attributeValue("DATE"));

           }

       } catch (DocumentException e) {

           e.printStackTrace();

       }

    }

    static void findXML(String path){

       SAXReader reader=new SAXReader();//构建sax读取对象

       try {

           Document doc=reader.read(path);//获取文档对象

           Element root=doc.getRootElement();//获取根节点

           Node node=doc.selectSingleNode("//Result/VALUE/NO");

           System.out.println(node.getText());

       } catch (DocumentException e) {

           e.printStackTrace();

       }

    }

    static void   writeXML(){

       //构建xml输出对象

       try {

           XMLWriter writer=new XMLWriter(new FileWriter("d:/link.xml"));

           Document doc=DocumentHelper.createDocument();//创建文档对象

           Element root=doc.addElement("学生信息");

          

           root.addElement("学生").addElement("姓名").addAttribute("性别", "男").addText("张三");//构建子节点，属性值和显示文本

           root.addElement("学生").addElement("姓名").addAttribute("性别", "女").addText("历史");//构建子节点，属性值和显示文本

          

           writer.write(doc);//输出文档对象

           writer.close();

       } catch (IOException e) {

           e.printStackTrace();

       }

    }

    public static void main(String[] args) {

       //Dom4jDmeo.readXML("d:/text.xml");

       //Dom4jDmeo.writeXML();

       Dom4jDmeo.findXML("d:/text.xml");

    }

}