xml解析

XmlTest.java

package com.jxl.tool;

import java.io.File;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

public class XmlTest {

	public static void main(String[] args) {
		DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        try {
		   DocumentBuilder db = dbf.newDocumentBuilder();
		   Document doc = db.parse("d:/xml.xml");
		   //得到根节点
		   Element root = doc.getDocumentElement();
		   //得到所有Tree
		   NodeList nl = root.getElementsByTagName("Tree");
		   //得到第一个TRee节点
		   Element e = (Element) nl.item(0);
		
		//删除节点,此处没用,给你留着参考的.
		   /*
		   Element stu2 = (Element)(root.getElementsByTagName("student").item(1));
		   root.removeChild(stu2);
		   */
		   
		   //增加节点
		   Element entry = doc.createElement("Entry");
		   entry.setAttribute("id", "2");
		   entry.setAttribute("parentId", "0");
		   entry.setAttribute("name", "li");
		   //在tree元素下增加元素
		   e.appendChild(entry);
		   
		   //回写
		   DOMSource ds = new DOMSource(doc);
		   StreamResult sr = new StreamResult(new File("d:/xml2.xml"));
		   TransformerFactory.newInstance().newTransformer().transform(ds, sr);
		   System.out.println("ok");
	  } catch (Exception e) {
	   e.printStackTrace();
	  } 
	}
}