ajax响应json字符串和json数组的实例（图文教程）

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ajax响应json字符串和json数组的实例（图文教程）

最近上班太忙，晚上抽空整理一下ajax请求中，后台返回json字符串和json数组的场景，以及前台的处理示例。直接看代码。json字符串的后台响应。package com.ajax；import java.io.IOException；import java.io.PrintWriter；import javax.servlet.ServletException；import javax.servlet.annotation.WebServlet；import javax.servlet.http.HttpServlet；import javax.servlet.http.HttpServletRequest；@WebServlet("；/jsonStr"；{"。

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导读最近上班太忙，晚上抽空整理一下ajax请求中，后台返回json字符串和json数组的场景，以及前台的处理示例。直接看代码。json字符串的后台响应。package com.ajax；import java.io.IOException；import java.io.PrintWriter；import javax.servlet.ServletException；import javax.servlet.annotation.WebServlet；import javax.servlet.http.HttpServlet；import javax.servlet.http.HttpServletRequest；@WebServlet("；/jsonStr"；{"。

下面我就为大家带来一篇ajax响应json字符串和json数组的实例。现在就分享给大家，也给大家做个参考。

最近上班太忙，晚上抽空整理一下ajax请求中，后台返回json字符串和json数组的场景，以及前台的处理示例。

直接看代码。

json字符串的后台响应

package com.ajax;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/jsonStr")
public class JsonStr extends HttpServlet {

 /**
 * 
 */
 private static final long serialVersionUID = 1L;

 @Override
 protected void doGet(HttpServletRequest req, HttpServletResponse resp)
 throws ServletException, IOException {
 // 构造json对象
 String resStr = "{" + "name:" + "\"zhangsan\"," + "id:" + "\"id001\"" + "}";
 
 //

输出json对象到前台 PrintWriter out = resp.getWriter(); out.write(resStr); out.flush(); out.close(); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doGet(req, resp); } }

json数组的后台响应

package com.ajax;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/jsonArr")
public class JsonArr extends HttpServlet {

 /**
 * 
 */
 private static final long serialVersionUID = 1L;

 @Override
 protected void doGet(HttpServletRequest req, HttpServletResponse resp)
 throws ServletException, IOException {
 // 构造json对象
 String resStr1 = "{" + "name:" + "\"zhangsan\"," + "id:" + "\"id001\"" + "}";
 String resStr2 = "{" + "name:" + "\"lisi\"," + "id:" + "\"id002\"" + "}";
 String resStr3 = "{" + "name:" + "\"wangwu\"," + "id:" + "\"id003\"" + "}";
 
 // 构造json数组
 String jsonArr = "[" + resStr1 + "," + resStr2 + "," + resStr3 + "]";
 
 //

输出json数组到前台 PrintWriter out = resp.getWriter(); out.write(jsonArr); out.flush(); out.close(); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doGet(req, resp); } }

前台页面

<%@ 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>Json</title>
</head>
<body>
 <br><br>
 <input type="button" value="JsonStr" onclick="jsonStr()" />
 <br><br>
 <table>
 <tr>
 <td>username</td>
 <td><input id="username"></td>
 </tr>
 <tr>
 <td>id</td>
 <td><input id="id"></td>
 </tr>
 </table>
 <br><br><br>
 <input type="button" value="JsonArr" onclick="jsonArr()" />
 <br><br>
 <table border="1" bordercolor="red">
 <caption>Json Array</caption>
 <thead>
 <tr>
 <th>Username</th>
 <th>Id</th>
 </tr>
 </thead>
 <tbody id="tb">
 </tbody>
 </table>
</body>
<script type="text/javascript">
 // json字符串处理方法
 function jsonStr() {
 var xhr = new XMLHttpRequest();
 xhr.open("get", "jsonStr");
 xhr.onreadystatechange = function(data) {
 if (xhr.readyState == 4 && xhr.status == 200) {
 // 将json字符串转换为json对象
 var obj = eval("(" + data.target.responseText + ")");
 document.getElementById("username").value = obj.name;
 document.getElementById("id").value = obj.id;
 }
 };
 xhr.send(null);
 }
 
 // json数组处理方法
 function jsonArr() {
 var xhr = new XMLHttpRequest();
 xhr.open("get", "jsonArr");
 xhr.onreadystatechange = function(data) {
 if (xhr.readyState == 4 && xhr.status == 200) {
 // 将json字符串转换为json数组
 var obj = eval("(" + data.target.responseText + ")");
 
 // 创建代码片段，用于存放表格行
 var oFragment = document.createDocumentFragment();
 
 // 根据json数组长度，产生行数据
 for (var i=0; i<obj.length; i++) {
 var trObj = document.createElement("tr");
 trObj.innerHTML = "<td>" + obj[i].name + "</td><td>" + obj[i].id + "</td>";
 oFragment.appendChild(trObj);
 }
 
 // 将行数据添加在表格的tBody部分
 document.getElementById("tb").appendChild(oFragment);
 }
 };
 xhr.send(null);
 }
</script>
</html>

页面效果图