JQuery ztree 异步加载实践

时间：2023-03-09 03:03:20
JQuery ztree 异步加载实践

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....

不过网上的几篇帖子还挺坑的！原始参考：JQuery异步加载实例，相对来说这篇博客还算规整！

springMVC中中文乱码问题：解决办法

准备工作

　　1 JQuery ZTree，下载地址

　　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。

JQuery ztree 异步加载实践

　　2 需要fastJSON,用来转换JSON对象，下载地址

　　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>

运行效果

JQuery ztree 异步加载实践

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