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<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="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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