使用ajax接收后台发送过来的json数据方法

2024-09-01 08:31:06

字体：大中小

来源：转载

供稿：网友

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武林网。

上一篇：ajax从JSP传递对象数组到后台的方法

下一篇：Ajax 接收服务器返回的json响应方法