<%@ 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>session1.jsp</title>
</head>
<body>
<%
String cardid = null ;
Cookie[] cks = request.getCookies() ; if(cks != null)
{
// 如果已经设置了cookie ， 则得到它的值，并保存到变量pName中
for(int i=0; i<cks.length; i++)
{
if(cks[i].getName().equals("cardid")) cardid = cks[i].getValue();
}
}
%>
<form action="session2.jsp" method="post">
卡号<input type="text" name="cardid" value="<% if(cardid != null) out.println(cardid); %>"><br>
密码<input type="password" name="password"><br>
<input type="submit" value="提交">
</form> </body>
</html>
<%@ 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>session2.jsp</title>
</head>
<body>
<%@page import="java.net.URLEncoder"%>
<%@page import="com.shuyinghengxie.bank.CardDAO"%>
<%@ page language="java" contentType="text/html; charset=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>
</head>
<body>
<%
//设置不缓存页面
response.setHeader("Cache-Control", "no-cache") ; //登陆成功定时跳转
//response.setHeader("refresh", "2;URL=http://www.baidu.com") ; //页面跳转
//response.sendRedirect("success.jsp") ; String kahao = request.getParameter("cardid") ; String password = request.getParameter("password") ; if(kahao==null || password==null ||
kahao == "" || password == "" )
{
out.write("请正确登录") ;
}
else
{
CardDAO cd = new CardDAO() ; if(cd.checkLogin(kahao, password))
{
//out.write("登陆成功") ;
response.getWriter().write("验证通过") ; //创建Cookie
Cookie ck = new Cookie("kah888o",kahao) ; //设置过期时间
ck.setMaxAge(10*24*60*60) ; //发送
response.addCookie(ck) ; //创建session
session.setAttribute("kahao", kahao) ;
session.setAttribute("username","李四") ; //设置session超时时间
//默认设置是20分钟
//如果超过20分钟没有任何请求发送给服务器，session就失效
session.setMaxInactiveInterval(30) ; response.sendRedirect("session3.jsp") ; }
else
{
out.write("登录失败") ;
}
} %>
</body>
</html>
</body>
</html>
<%@ 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>session3.jsp</title>
</head>
<body>
<%
Object kahao = session.getAttribute("kahao") ; if(kahao != null)
{
out.write("您已登陆") ;
}
else
{
out.write("尚未登陆") ;
}
%>
<a href="session4.jsp">退出登录</a>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=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>session4.jsp</title>
</head>
<body>
已退出！
<% session.invalidate() ; //销毁session //2秒后跳转
response.setHeader("refresh","2 ; url= session3.jsp") ; %> </body>
</html>
这时点击退出，跳到session4页面，此页面定时2秒跳转session3
这是可以看到已退出登陆
