java web 程序---登陆验证session。提示登陆
loigin.jsp
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'login.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> <form action="check.jsp"> 账号： <input type="text" name="user"/><br/> 密码：<input type="text" name="pass"/><br/> <input type="submit" value="登陆"/> </form> </body> </html>
check.jsp
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'check.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>
<%
String name=request.getParameter("user");
String pass=request.getParameter("pass");
if(name.equals("abc")&&pass.equals("mas")){
session.setAttribute("name",name);
session.setAttribute("pass",pass);
%>
<jsp:forward page="a.jsp"/>
<% }else{
out.print("你好，你的输入有误！");
%>
<a href ="login.jsp">重新登陆</a>
<%}%>
</body>
</html>
a.jsp
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'a.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> <% String a=(String)session.getAttribute("name"); String b=(String)session.getAttribute("pass"); if(a==null||b==null){%> <jsp:forward page="b.jsp"/> <%}%> 登陆成功 </body> </html>
b.jsp
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'b.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> 请先登陆 <a href="login.jsp">重新登陆</a> </body> </html>
