JQuery ztree 异步加载实例讲解

本来要做一个文件目录浏览界面，需要遍历所有的文件和目录，很显然一次性读取时很费时费力的一件事情。
因此就需要做异步加载....
准备工作：
1下载 JQuery ZTree
复制其中的JS和CSS即可，其实没必要引那么多，用什么引什么就可以。

2 需要fastJSON,用来转换JSON对象
我下载JAR包后，引入到Eclipse中总是报找不到class错误。
解决办法：把jar包放在WEB-INF/lib下即可。
代码实例：
index.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"pageEncoding="utf-8"%><！DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>Insert title here</title><link rel="stylesheet" href="resources/css/demo.css" type="text/css"><link rel="stylesheet" href="resources/css/zTreeStyle/zTreeStyle.css" type="text/css"><script type="text/javascript" src="resources/js/jquery-1.4.4.min.js"></script><script type="text/javascript" src="resources/js/jquery.ztree.core-3.5.js"></script></head><body><div class="zTreeDemoBackground left"><ul id="treeDemo" class="ztree"></ul></div><SCRIPT type="text/javascript">var setting = { data: { simpleData: { enable: true } } ,async: {enable: true,url:"/TestZTree/test",autoParam:["id", "name", "level"],otherParam:{"otherParam":"zTreeAsyncTest"},dataFilter: filter}}; function filter（treeId, parentNode, childNodes） {if （！childNodes） return null;for （var i=0, l=childNodes.length; i<l; i++） {childNodes[i].name = childNodes[i].name.replace（/.n/g, "."）;}return childNodes;}var zNodes =[ { id:1, pId:0, name:"parentNode 1", open:true}, { id:11, pId:1, name:"parentNode 11",isParent:true}, { id:111, pId:11, name:"leafNode 111"}, { id:112, pId:11, name:"leafNode 112"}, { id:12, pId:1, name:"parentNode 12",isParent:true}, { id:121, pId:12, name:"leafNode 121"}, { id:13, pId:1, name:"parentNode 13", isParent:true}, { id:2, pId:0, name:"parentNode 2", isParent:true} ];$（document）.ready（function（）{ $.fn.zTree.init（$（"#treeDemo"）, setting, zNodes）; }）; </SCRIPT></body></html>

testServlet.java

package com.test;import java.io.IOException;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.JSONArray;import com.alibaba.fastjson.JSONObject;public class testServlet extends HttpServlet{@Override public void doGet（HttpServletRequest request, HttpServletResponse response） throws ServletException, IOException { doPost（request, response）; }@Override public void doPost（HttpServletRequest request, HttpServletResponse response） throws ServletException, IOException { String id = request.getParameter（"id"）; String name = request.getParameter（"name"）; String level = request.getParameter（"level"）; String otherParam = request.getParameter（"otherParam"）; System.out.println（id + "|" + name + "|" + level + "|" + otherParam）;List<HashMap<String,Object>> list = new ArrayList<HashMap<String,Object>>（）; for（int i = 0; i < 5; i++）{ HashMap<String,Object> hm = new HashMap<String,Object>（）;//最外层，父节点 hm.put（"id",id+i）;//id属性 ，数据传递hm.put（"name", id+i）; //name属性，显示节点名称hm.put（"pId", id）;list.add（hm）; } response.getWriter（）.write（JSON.toJSONString（list））; } }

web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <display-name></display-name> <servlet><servlet-name>testServlet</servlet-name><servlet-class>com.test.testServlet</servlet-class> </servlet> <servlet-mapping><servlet-name>testServlet</servlet-name><url-pattern>/test</url-pattern> </servlet-mapping><welcome-file-list><welcome-file>index.jsp</welcome-file> </welcome-file-list></web-app>

效果图：

以上就是关于jquery异步加载，希望对大家学习jquery程序设计有所帮助。