ＪＳＰ内置对象－－－ｒｅｑｕｅｓｔ和　rｅｓｐｏｎｓｅ

<%@page import="java.net.URLEncoder"%>
<%@page import="com.hanqi.web.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>

<%
//设置不缓存页面
response.setHeader("Cache_Control", "no-cache");


//定时跳转
//response.setHeader("refresh", "2;URL=http://www.baidu.com");
//接受数据
String cairnumber =request.getParameter("cairnumber");
String password =request.getParameter("password");

if(cairnumber==null || password == null||cairnumber.equals("")||password.equals(""))
{
out.write("请正确登录系统");

}
else
{
	//检查登入信息
	CardDAO  cd=new CardDAO();
	if(cd.checkLogin(cairnumber, password))
	{
		//out.write("登入成功");
		//无缓存的直接发送
		response.getWriter().write("验证成功");
		
		//创建cookie
		Cookie ck= new Cookie("cairnumber",cairnumber);
		ck.setMaxAge(10*24*60*60);//设置过期时间
		//发送
		response.addCookie(ck);
		
		//对中文进行转码
		Cookie ck1 =new Cookie("username",URLEncoder.encode("张三"));
		response.addCookie(ck1);
		
		//创建session
		session.setAttribute("cairnumber", cairnumber);
		session.setAttribute("username", "李四");
		
		//设置session超时的时间
		//默认设置是20分钟
		//如果连续超过20分钟没有任何请求发送给服务器，session就失效
		//session.setMaxInactiveInterval(30);
		
		//页面跳转
		response.sendRedirect("Main.jsp");
		//response.sendRedirect("http://www.baidu.com");
	}
	else
	{
		out.write("登入失败");
		//跳回登入页面
		response.setHeader("refresh", "2;URL=Login.jsp");
	}
}

%>

</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>
系统主页面
<br>
cookie列表
<br>
<%
//检查cookie
//获得cookie集合
Cookie[] cks=  request.getCookies();
for(Cookie ck: cks)
{
	//解码
	out.write(ck.getName()+"="+URLDecoder.decode(ck.getValue()) +"<br>");
}





%>
<br>
<br>
<%
//判断session
String cairnumber = session.getAttribute("cairnumber").toString();
out.print("cairnumber="+cairnumber);

%>
<br>
<a href="TestLogin.jsp">测试是否已登录的页面</a>
</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>Insert title here</title>
</head>
<body>

<%
Object obj =session.getAttribute("cairnumber");//判断session是否存在
if(obj==null)
{
 out.print("您没有登入")	;
 response.setHeader("refresh", "2;URL=Login.jsp");
}
else
{
	out.print("cairnumber="+obj.toString());
	//销毁所有session
	//session.invalidate();
	//移除某个属性
	session.removeAttribute("cairnumber");
}



%>

</body>
</html>

ＪＳＰ内置对象－－－ｒｅｑｕｅｓｔ和 rｅｓｐｏｎｓｅ

ＪＳＰ内置对象－－－ｒｅｑｕｅｓｔ和　rｅｓｐｏｎｓｅ