Servlet Cookie如何实现记住密码，自动登录的效果呢？
下文笔者讲述Servlet使用Cookie技术，实现密码记录及自动登录的效果分享，如下所示:
实现思路:
1.将登录所使用的账号及密码存入到客户端的Cookie中
2.Servlet加载时，自动加载Cookie并使用其中的账号和密码，然后根据相应的逻辑实现自动登录操作
例:
//login.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>用户登录</title>
<%
String username = "";
String password = "";
//获取当前站点的所有Cookie
Cookie[] cookies = request.getCookies();
for (int i = 0; i < cookies.length; i++) {//对cookies中的数据进行遍历，找到用户名、密码的数据
if ("username".equals(cookies[i].getName())) {
username = cookies[i].getValue();
} else if ("password".equals(cookies[i].getName())) {
password = cookies[i].getValue();
}
}
%>
</head>
<body>
<form action="login_handler.jsp" method="post">
username:<input type="text" name="name" value="<%=username%>" /><br/>
password:<input type="password" name="pwd" value="<%=password%>" /><br/>
<input type="checkbox" value="y" name="isLogin">自动登录<br/>
<input type="submit" value="登录" />
</form>
</body>
</html>
//login_handler.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%
String name = request.getParameter("name");
String pwd = request.getParameter("pwd");
String flag = request.getParameter("isLogin");
if (!"admin".equals(name) && !"pwd123456".equals(pwd)) {
response.sendRedirect("error.jsp");
} else {
if ("y".equals(flag)) {
//创建两个Cookie对象
Cookie nameCookie = new Cookie("username", name);
//设置Cookie的有效期为3天
nameCookie.setMaxAge(60 * 60 * 24 * 3);
Cookie pwdCookie = new Cookie("password", pwd);
pwdCookie.setMaxAge(60 * 60 * 24 * 3);
response.addCookie(nameCookie);
response.addCookie(pwdCookie);
}
response.sendRedirect("success.jsp");
}
%>
//success.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>Succes成功</title>
</head>
<body>success.
</body>
</html>
//error.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>error错误</title>
</head>
<body>error.
</body>
</html>
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