核心提示：如何利用cookie实现自动登录？%@ page language=java contentType=text/html; charset=ISO-8859-1pageEncoding=UTF-8 s...
如何利用cookie实现自动登录？
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="UTF-8" session="false"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "https://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<%
//先从请求里面拿到name的值，如果不为空，那么直接打印
String name = request.getParameter("name");
//如果能拿到 則放入cookie
if (name != null && !name.trim().equals("")) {
Cookie cookie = new Cookie("name", name);
System.out.print(cookie.getName()+":"+cookie.getValue());
cookie.setMaxAge(30);
response.addCookie(cookie);
}
else {
//如果拿不到，则从cookie里面找
Cookie[] cookies = request.getCookies();
if (cookies != null && cookies.length > 0) {
for (Cookie c : cookies) {
if ("name".equals(c.getName())) {
name = c.getValue();
System.out.print(c.getName()+":"+c.getValue());
}
}
}
}
//如果name不为空 则打印欢迎页面
if (name != null && !name.trim().equals("")) {
out.print("HELLO:" + name);
} else {
//否则重定向到登录页面
response.sendRedirect("login.jsp");
}
%>
</body>
</html>
