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ajax响应json字符串和json数组的实例(详解)_AJAX相关_

2023-05-25 252人已围观

简介 ajax响应json字符串和json数组的实例(详解)_AJAX相关_

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"%>Json



username
id





Json Array
UsernameId

页面效果图

点击 JsonStr 和 JsonArr 按钮后的效果

好了,整理完毕,示例仅供学习。

对了,有一点疑惑,之前回调函数中,获取响应数据的时候,都是直接通过data.responseText 来获取的,今天的代码中必须使用data.target.responseText,不知道为什么?有知道的朋友烦请告知一声,非常感谢。

以上这篇ajax响应json字符串和json数组的实例(详解)就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持。

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