（1）发送请求index.jsp，注意引入jquery.min.js文件
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="GB18030"%> <!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=utf-8"> <title>Insert title here</title> <script src="jquery.min.js"></script> <script> jQuery(document).ready(function($) { $(‘#send‘).click(function(){ $.ajax({ type: "POST", url: "ajax.jsp", async:false, data: {name:"name", content:"content"}, // dataType: "json", dataType: "text", success: function(data){ //alert(JSON.stringify(data));//使用JSON方法，需引入jar包，json-java.jar、json-lib.jar alert(data); }, error: function(e) { alert(e); } }); }); }); </script> </head> <body> <div> <button id="send">test</button> </div> </body> </html>
（2）接受请求并返回值ajax.jsp
<%@ page contentType="text/html; charset=gb2312" %> <% String id=request.getParameter("name"); System.out.println("Parameter is :"+id); //out.print("{3:8,9:4}");//json out.print("sdfwsuueiw"); %>
原文：http://www.cnblogs.com/langdangyunliu/p/4079736.html