使用ajax接收后台发送过来的json数据方法 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 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 initArray(){ ArrayList arr = new ArrayList(); 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 
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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中文源码网。