本文出自：http://blog.csdn.net/svitter
实验环境：Myeclipse10 + tomcat7
简单应用于登陆界面。jsp：forward的作用是，把当前的JSP页引导到另一个页面上，浏览器地址本显示的是当前网页的地址，内容则是另一个界面的。
1.User.html
<!DOCTYPE html> <html> <head> <title>登陆信息</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <!--<link rel="stylesheet" type="text/css" href="./styles.css">--> </head> <body> <form action="Login.jsp" method="post" name="Loginfrm" id="Loginform"> <table width="298" border="0" align="center" cellpadding="2" cellspacing="1"> <tr> <td align="right">用户名:</td> <td align="left"><input name="User" type="text" size="30"> </td> </tr> <tr> <td align="right">密码:</td> <td align="left"><input name="Password" type="password" size="30"> </td> </tr> <tr> <td colspan="2" align="center"><input type="submit" value="login"> <input type="reset" value="reset"></td> </table> </form> </body> </html>
2.Login.jsp
<%@ 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>用户登陆</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>
<body>
<%
String User=request.getParameter("User");
String Password=request.getParameter("Password");
if(User.equals("Admin") && Password.equals("Admin")){%>
<jsp:forward page="welcome.jsp"/>
<%} else { %>
<jsp:forward page="errorPage.jsp"/>
<%} %>
</body>
</html>
3.errorPage.jsp; 注意isErrorPage=TRUE；
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" isErrorPage="true"%>
<%
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>错误处理页面</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>
<body>
<h1>错误信息</h1>
<hr><center>
<h3><%=exception%>
</h3>
</center>
</body>
</html>
4.welcome.jsp
<%@ 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 ‘welcome.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>
<body>
Welcome!<br>
</body>
</html>
对应资源下载：http://download.csdn.net/detail/svitter/7358523