<%@ 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=utf-8"> <title>Insert title here</title> <script type="text/javascript" src="${pageContext.request.contextPath }/jquery.js"></script> </head> <body> <button onclick="ok()">ok</button> </body> <script type="text/javascript"> function ok(){ $(function(){ $.post( // 'http://localhost:8080/zday02/f', '${pageContext.request.contextPath}/f', function(data){ alert("ok") } ) }) } </script> </html>