jsp利用cookie记住用户名,下次登录时显示在文本框中（仅仅一个Cookie就整了将近三个小时，⊙﹏⊙b汗）

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<%@page import="java.net.URLDecoder"%>
<%@page import="sun.security.util.Length"%>
<%@ 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>
</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，将该值放在卡号文本框的value中
for(int i=0; i<cks.length; i++)
{
if(cks[i].getName().equals("cardid")) cardid = cks[i].getValue();
}
}
%>
<form action="Cookie2.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 import="java.net.URLEncoder"%>
<%@page import="com.shuyinghengxie.bank.CardDAO"%>
<%@ 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>
</head>
<body>
<%
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("cardid",kahao) ; //设置过期时间
ck.setMaxAge(10*24*60*60) ; //发送
response.addCookie(ck) ; response.sendRedirect("a.jsp") ; }
else
{
out.write("登录失败") ;
}
}
%>
</body>
</html>

<%@page import="java.net.URLDecoder"%>
<%@ 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>
</head>
<body>
登陆成功！
</body>
</html>