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08aee07 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 | <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import="javax.servlet.ServletException" %>
<%@ page import="javax.servlet.annotation.WebServlet" %>
<%@ page import="javax.servlet.http.Cookie" %>
<%@ page import="javax.servlet.http.HttpServlet" %>
<%@ page import="javax.servlet.http.HttpServletRequest" %>
<%@ page import="javax.servlet.http.HttpServletResponse" %>
<%@ page import="java.io.IOException" %>
<%@ page import="java.net.URLDecoder" %>
<%@ page import="java.net.URLEncoder" %>
<%@ page import="java.text.SimpleDateFormat" %>
<%@ page import="java.util.Date" %>
<html>
<head>
<title>jsp_test</title>
</head>
<body>
<%
//设置响应的消息体的数据格式及其编码
//1、获取所有Cookie
Cookie[] cookies = request.getCookies();
boolean flag = false;//标记是否访问过
//2、遍历Cookie数组
if (cookies != null && cookies.length > 0) {
for (Cookie cookie : cookies) {
//3、获取Cookie的名称
String name = cookie.getName();
//4、判断名称是否是 lastTime
if ("lastTime".equals(name)) {
//有该Cookie，不是第一次访问 -- 取出时间
String value = cookie.getValue();
flag = true;
//重新设置Cookie的value
Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String str_date = sdf.format(date);
//Cookie不能有特殊字符 -- 如:空格 -- 需要转码
//URL编码
System.out.println("编码前：" + str_date);
str_date = URLEncoder.encode(str_date, "UTF-8");
System.out.println("编码后：" + str_date);
cookie.setValue(str_date);//更换内部数据
//设置Cookie的存活时间
cookie.setMaxAge(60 * 60 * 24 * 30);//一个月
response.addCookie(cookie);//会自动把name相同的Cookie替换掉
//URL解码
value = URLDecoder.decode(value, "UTF-8");
%>
<h1>欢迎回来，您上次访问的时间是：<%= value %></h1>
您想要的是：<input type="text">
<%
break;
}
}
//是第一次访问
if (!flag) {
//创造cookie
Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String str_date = sdf.format(date);
//URL编码
System.out.println("编码前：" + str_date);
str_date = URLEncoder.encode(str_date, "UTF-8");
System.out.println("编码后：" + str_date);
Cookie cookie = new Cookie("lastTime", str_date);
//设置Cookie的存活时间
cookie.setMaxAge(60 * 60 * 24 * 30);//一个月
response.addCookie(cookie);
%>
<h1>您好！这是您的首次访问</h1>
<%
}
}
%>
</body>
</html> |