使用ajax接收后台发送过来的json数据方法

前端  /  管理员 发布于 4年前   227

今天给大家带来一个简单的使用ajax接收后台返回json格式的demo

废话不多说直接上代码

后台代码

package com.sidan.outjson; 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; import com.sidan.jsonutil.GetJson;/** * Servlet implementation class OutJson */@WebServlet("/OutJson")public class OutJson extends HttpServlet {private static final long serialVersionUID = 1L;   /**  * @see HttpServlet#HttpServlet()  */ public OutJson() {  super();  // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doPost(request,response);} /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {response.setCharacterEncoding("UTF-8");PrintWriter out = response.getWriter();String s = GetJson.getJson();out.print(s);} }

Pserson类

package com.sidan.jsonutil; public class Person {private String name;private String sex;private int age;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}}

将数据包装成json格式类（数据直接是循环添加的所以一样这里是为了简单）

package com.sidan.jsonutil; import java.util.ArrayList; public class GetJson {public static String getJson(){return json().toString();}public static StringBuffer json(){StringBuffer sb = new StringBuffer();ArrayList<Person> arr = initArray();int x = 0;sb.append("[");for(Person p:arr){sb.append("{");sb.append("\"name\"");sb.append(":");sb.append("\""+p.getName()+"\"");sb.append(",");sb.append("\"age\"");sb.append(":");sb.append("\""+p.getAge()+"\"");sb.append(",");sb.append("\"sex\"");sb.append(":");sb.append("\""+p.getSex()+"\"");sb.append("}");if(x != arr.size()-1){sb.append(",");}x++;}sb.append("]");return sb;}public static ArrayList<Person> initArray(){ArrayList<Person> arr = new ArrayList<Person>();for(int i = 0;i < 10;i++){Person p = new Person();p.setName("sdchen");p.setAge(20);p.setSex("man");arr.add(p);}return arr;}}

jsp页面代码

<pre name="code" class="html"><%@ 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=ISO-8859-1"><title>Insert title here</title><script src="//article/jQuery/jquery-3.1.1.min.js"></script><script type="text/javascript">$(function(){$("#btn").click(function(){var url = "OutJson";$.ajax({url:url,type:"post",dataType:"json",error:function(XMLHttpRequest, textStatus, errorThrown){alert(XMLHttpRequest);alert(textStatus);alert(errorThrown);},success:function(data){$.each(data,function(idx,obj){var li = document.createElement("li");     li.innerHTML = "<a>" + obj.name + "</a>";     document.getElementById("ul1").appendChild(li);});}});});});</script></head><body><ul id="ul1"></ul> <input type="button" value="循环" id="btn"/></body></html>

写这个demo也费了很大劲，毕竟是新手，也从错误中学到了很多，比如dataType写成datatype时ajax默认接收的数据是为text这样导致我总是循环不了,还有就是json数据的格式是非常严谨的

就因为最后多了一个逗号就导致总是出错，并且循环不了，最后将错误打印出来才知道这个格式是错了的

以上这篇使用ajax接收后台发送过来的json数据方法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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