java DOM解析XML(2) 树

//=======a.xml===================

<?xml version="1.0" encoding="GB2312"?>
<people>
    <person personID="1">
       <name>CY</name>
       <age>22</age>
       <address>武汉</address>
    </person>
    <person personID="2">
       <name>SUN</name>
       <age>18</age>
       <address>襄樊</address>
    </person>
    <person personID="3">
       <name>LiGuo</name>
       <age>55</age>
       <address>武汉</address>
    </person>
    <person personID="4">
       <name>wj</name>
       <age>55</age>
       <address>应城</address>
    </person>
</people>

//====java文件===treeTest.java=================

/**//*
 * treeTest.java
 *
 * Created on 2008年2月17日, 下午9:33
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package javaapplication2;
/** *//**
 *
 * @author Administrator
 */
import java.awt.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
import org.w3c.dom.*;
import javax.xml.parsers.*;
class treeTest extends JFrame {
    private JTree tree=null;
    private DefaultTreeModel treeModel=null;
    private static String Na=null;   //定义Name元素
    private static String Ag=null; //定义Age元素
    private static String Address=null;  //定义Address元素
    private static String sqlStr=null;
    private static String person=null;
    DefaultMutableTreeNode root=null;
    DefaultMutableTreeNode aaa=null;
    DefaultMutableTreeNode ccc1=null;
    DefaultMutableTreeNode ccc2=null;
    DefaultMutableTreeNode ccc3=null;
    
    public treeTest(String tit) throws Exception {
        super(tit);
        javax.xml.parsers.DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
        //根据解析器工厂来获得具体的加载文档对象
        javax.xml.parsers.DocumentBuilder builder=factory.newDocumentBuilder();
        //加载XML文件  路径不能是中文
        Document doc=builder.parse("a.xml");
        NodeList n1=doc.getElementsByTagName("person");
        root=new DefaultMutableTreeNode("People");
        treeModel=new DefaultTreeModel(root);
        tree=new JTree(treeModel);
        for(int i=0;i<n1.getLength();i++) {
            //生成一个Element对象来存放具体节点的值
            Element node=(Element)n1.item(i);
            person=node.getNodeName().toString()+i;
            Na=node.getElementsByTagName("name").item(0).getFirstChild().getNodeValue();
            Ag=node.getElementsByTagName("age").item(0).getFirstChild().getNodeValue();
            Address=node.getElementsByTagName("address").item(0).getFirstChild().getNodeValue();
            
            aaa=new DefaultMutableTreeNode(person);
            ccc1=new DefaultMutableTreeNode(Na);
            ccc2=new DefaultMutableTreeNode(Ag);
            ccc3=new DefaultMutableTreeNode(Address);
            aaa.add(ccc1);
            aaa.add(ccc2);
            aaa.add(ccc3);
            treeModel.insertNodeInto(aaa,root,i);     //将每个aaa加到根节点root中
        }
        getContentPane().add(tree,BorderLayout.CENTER);
        final JLabel messageLabel=new JLabel("用户还没有选择!");
        add(messageLabel,BorderLayout.SOUTH);
        tree.addTreeSelectionListener(new TreeSelectionListener() {
            public void valueChanged(TreeSelectionEvent t) {
                TreePath tp=t.getNewLeadSelectionPath();
                messageLabel.setText("您选择了:"+tp.getLastPathComponent());
            }
        });
        setSize(500,500);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }
    public static void main(String args[]) throws Exception {
        JFrame.setDefaultLookAndFeelDecorated(true);
        new treeTest("JTree-XML-Test");
    }
}