今天給大家帶來一個簡單的使用ajax接收后臺返回json格式的demo
廢話不多說直接上代碼
后臺代碼
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類
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; } }將數據包裝成json格式類（數據直接是循環添加的所以一樣這里是為了簡單）
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頁面代碼
<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="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="循環" id="btn"/></body></html>寫這個demo也費了很大勁，畢竟是新手，也從錯誤中學到了很多，比如dataType寫成datatype時ajax默認接收的數據是為text這樣導致我總是循環不了,還有就是json數據的格式是非常嚴謹的
就因為最后多了一個逗號就導致總是出錯，并且循環不了，最后將錯誤打印出來才知道這個格式是錯了的
以上這篇使用ajax接收后臺發送過來的json數據方法就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持武林網。
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