Cookie免用戶登陸實現原理
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代碼實現
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="http://localhost:8080/13_cookie_session/loginServlet" method="get">
用戶名：<input type="text" name="username" value="${cookie.username.value}"> <br>
密碼：<input type="password" name="password"> <br>
<input type="submit" value="登錄">
</form>
</body>
</html>
package com.servlet;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class LoginServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String username = req.getParameter("username");
String password = req.getParameter("password");
if ("wzg168".equals(username) && "123456".equals(password)) {
//登錄 成功
Cookie cookie = new Cookie("username", username);
cookie.setMaxAge(60 * 60 * 24 * 7);//當前Cookie一週內有效
resp.addCookie(cookie);
System.out.println("登錄 成功");
} else {
// 登錄 失敗
System.out.println("登錄 失敗");
}
}
}
