1：设置Cookie
<%@ page contentType=" text/html;charset=UTF-8" language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="java.net.URLDecoder"%>
<!DOCTYPE HTML>
<html>
<head>
<title>通过Cookie保存并读取用户登录的信息</title>
</head>
<body>
<%
Cookie[] cookies=request.getCookies();
String user="";
String date="";
for(Cookie c:cookies)
{
if(c.getName().equals("user"))
{
user=c.getValue();
}
if(c.getName().equals("date"))
{
date=c.getValue();
}
}
if(user.equals("")&&date.equals("")){
%>
<h2>客户你好，欢迎你初次光临本网站！</h2>
<form action="write.jsp" method="post">
请输入姓名:<input type="text" name="name" value="">
<input type="submit" value="确定">
</form>
<%
}
else
{
%>
[欢迎<b><%=user%></b>]再次光临本网站<br>
你注册时间是:<%=date%>
<%
}
%>
</body>
</html>
2:读取Cookie
<%@ page contentType=" text/html;charset=UTF-8" language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="java.net.URLEncoder,java.text.SimpleDateFormat"%>
<!DOCTYPE HTML>
<html>
<head>
<title>向Cookie中写入信息</title>
</head>
<body>
<%
request.setCharacterEncoding("UTF-8");
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS");
String date=sdf.format(new java.util.Date());
String user=request.getParameter("user");
Cookie userCookie=new Cookie("user",user);
Cookie dateCookie=new Cookie("date",date);
userCookie.setMaxAge(24*60*60*10);//设置最大期限保存10天
dateCookie.setMaxAge(24*60*60*10);
response.addCookie(userCookie);
response.addCookie(dateCookie);
%>
</body>
</html>