Ajax之json返回结果是集合的处理

Jquery实现ajax：

$.ajax({

      type   //数据的提交方式：get和post

       url   //数据的提交路径

       async   //是否支持异步刷新，默认是true

       data    //需要提交的数据

       datatype   //服务器返回数据的类型，例如xml,String,Json等

       success    //请求成功后的回调函数

       error   //请求失败后的回调函数});

}

)

json对服务器返回结果是集合的处理

success:function(data){成功处理

            var json = eval('('+data+')'); 将JSON的字符串解析成JSON数据格式

            var table="<table>";

            for(var i in json){

table+="<tr><td>"+json[0].id+"</td><td>"+json[i].name+"</td><td>"+json[i].birthday+"</td><td>"+json[i].regTime+"</td></tr>";

            $("#show").html(table);显示在页面

             }

            table+="</table>";

            },

代码实现：

userList.jsp

<%--

  Description:ajax 返回集合

  User: jiatp

  Date: 2019/5/22

  Time: 21:45

--%>

<%@ 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>

</head>

<script type="text/javascript" src="js/jquery.js"></script>

<script type="text/javascript">

    //初始化

    $(function () {

            $("#btn").click(function () {

              $.ajax({

                  type:"post",

                  url:"showAllUserList",

                  data:{},

                  datatype:"json",

                  success:function (data) {

                      //转换为javascript对象

                      var user = eval('('+data+')');

                      var str = "<table>";

                      var strcontent = "";

                      for(var i=0;i<user.length;i++){

                          strcontent+="<tr><td>"+user[i].id+"</td><td>"+user[i].name+"</td><td>"+user[i].address+"</td></tr>"

                      }

                      str+=strcontent+"</table>";

                      $("#content").html(str);

                  },error:function () {

                   alert("error!");

                  }

              })

            })

    })

</script>

<body>

<input type="button" id="btn" value="显示集合">

<div id="content"></div>

</body>

</html>

showAllUserList.java

package com.chinasofti.servlet;

import com.chinasofti.entity.User;

import net.sf.json.JSONArray;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.ArrayList;

import java.util.List;

/**

 * Description:ajax返回一个集合对象

 * USER:jiatp

 * Date:2019/5/22 22:16

 * */

@WebServlet("/showAllUserList")

public class showAllUserList extends HttpServlet {

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");

        request.setCharacterEncoding("utf-8");

        List<User> userList = new ArrayList();

        User user1 = new User();

        user1.setName("张三");

        user1.setAddress("北京");

        user1.setId(1);

        User user2 = new User();

        user2.setName("李四");

        user2.setAddress("上海");

        user2.setId(2);

        //添加到集合

        userList.add(user1);

        userList.add(user2);

        PrintWriter out = response.getWriter();

        //将user对象转换成json格式

        JSONArray json = JSONArray.fromObject(userList);

        System.out.println(json);

        out.print(json);

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        doPost(request,response);

    }

}

注：var json = eval('('+data+')'); 将JSON的字符串解析成JSON数据格式