代码如下：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<!-- 将表单提交并在本页显示 -->
<body>
<form action="index.jsp" method="post">
用户登录：<input type="text" name="user" /><br>
密码：<input type="password" name="password"/><br>
<input type="submit">
</form>
<hr>
<%
if((request.getParameter("user")!=null)&&(request.getParameter("password")!=null)){ %>
用户参数名为：<%=request.getParameter("user")%><br>
密码为：<%=request.getParameter("password")%>
<%} %>
</body>
</html>