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jsp之cookie案例（二）

兮动人发表于 2021/10/24 16:13:43 2021/10/24

【摘要】 jsp之cookie案例（二）

设置cookie的有效时间获取cookie的值

login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<%!
		String uname  ;
	%>
	<%	
		boolean flag = false;
		Cookie[] cookies = request.getCookies() ;
		for(Cookie cookie :cookies){
			if(cookie.getName().equals("uname")){
				uname = cookie.getValue() ;
				flag = true;
			}
		}
		//判断cookie是否生效
		if(!flag){
			out.print("cookie已经失效");
		}
		else{
			out.print("cookie："+uname);
		}
	%>


	<form action="check.jsp" method="post">
		用户名:<input type="text" name="uname"  value="<%=(uname==null?"":uname)%>"><br/>
		
		
		密码:<input type="password" name="upwd"><br/>
		<input type="submit" value="登陆"><br/>
		
	</form>
</body>
</html>

check.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
		<%
			request.setCharacterEncoding("utf-8") ;
			String name = request.getParameter("uname");
			String pwd = request.getParameter("upwd");
			
			//将用户名 加入到Cookie中
			Cookie cookie = new Cookie("uname",name);
			
			//设置cookie的有效时间，单位为秒
			cookie.setMaxAge(10);
			
			//服务端增加cookie
			response.addCookie(cookie) ;
			
			//服务端给客户端响应将cookie给客户端，转发或重定向都可以
			response.sendRedirect("A.jsp") ;
		
		%>
</body>
</html>

A.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>

</body>
</html>