ajax响应json字符串和json数组的实例(详解)
下面小编就为大家带来一篇ajax响应json字符串和json数组的实例(详解)。小编觉得挺不错的，现在就分享给大家，也给大家做个参考。一起跟随小编过来看看吧
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 |
| Username | Id |
|---|
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。
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