需求：
前端通过jQuery Ajax传输json到后端，后端接收json，对json进行处理，后端返回一个json给前端
这里使用servlet的方式
1、采用$.post方法
index.jsp页面
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <%@ page contentType="text/html; charset=UTF-8"%> <html> <head> <title></title> <script src="js/jquery-1.12.2.js"></script> <script language="JavaScript"> function checkUserid() { $.post('Ajax/CheckServlet',//url { userid : $("#userid").val(), sex : "男" }, function(data) { var obj = eval('(' + data + ')'); alert(obj.success); }); } </script> </head> <body> 用户ID: <input type="text" id="userid" name="userid"> <span id="msg"></span> <br> <button onclick="checkUserid()">传输</button> </body> </html> CheckServlet.Java代码如下
package com.ajax; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class CheckServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { /*设置字符集为'UTF-8'*/ request.setCharacterEncoding("UTF-8"); response.setCharacterEncoding("UTF-8"); String userid = request.getParameter("userid"); // 接收userid String sex = request.getParameter("sex");//接收性别 System.out.println(userid); System.out.println(sex); //写返回的JSON PrintWriter pw = response.getWriter(); String json = "{'success':'成功','false':'失败'}"; pw.print(json); pw.flush(); pw.close(); } } 由于这里采用的是servlet的方式，所以要配置web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"> <display-name>Ajax</display-name> <servlet> <servlet-name>CheckServlet</servlet-name> <servlet-class>com.ajax.CheckServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>CheckServlet</servlet-name> <url-pattern>/Ajax/CheckServlet</url-pattern> </servlet-mapping> </web-app>
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