本案例中用到了jquery的 tree插件，在本文的附件中可以下载
jsp代码：
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <base href="<%=basePath%>"> <title>jQuery Tree </title> <link rel="stylesheet" href="css/tree/jquery.treeview.css" /> <link rel="stylesheet" href="css/tree/red-treeview.css" /> <link rel="stylesheet" href="css/tree/screen.css" /> <script type="text/javascript" src="js/jquery.js"></script> <script type="text/javascript" src="js/tree/jquery.cookie.js"></script> <script type="text/javascript" src="js/tree/jquery.treeview.js"></script> <script type="text/javascript" src="js/tree/jquery.treeview.async.js"></script> <script type="text/javascript"> function initTrees() { $("#mixed").treeview({ url: "Tree", ajax: { data: { "additional": function() { return "yeah: " + new Date; } }, type: "post" } }); } $(document).ready(function(){ initTrees(); $("#refresh").click(function() { $("#mixed").empty(); initTrees(); }); }); </script> </head> <body> <ul id="mixed"> </ul> <button id="refresh">Refresh both Trees</button> </body></html>=-=====================java代码：本人用的是 servlet
package com;
import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class Tree extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/plain"); response.setCharacterEncoding("UTF-8"); PrintWriter out = response.getWriter(); String re = "[{'text':'root','expanded':false,'children':[{'text':'1.1 jQuery core'},{'text':'1.2 my jQuery Tree'}]}" + ",{'text':'2 hhh'},{'text':'3 xxx'}]"; out.flush(); System.out.println(re); out.write(re); out.close(); }}