28-Cookie练习--免用户名登录

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Cookie练习–免用户名登录

图解

在这里插入图片描述

代码演示

login.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<form action="http://localhost:8080/02_Cookie/login" method="get">
    用户名: <input type="text" name="username" value="${cookie.username.value}"><br>
    密码: <input type="password" name="password" ><br>
    <input type="submit" value="提交">
</form>
</body>
</html>

LoginServlet

package com.tian.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)){
            //登录成功
            Cookie cookie = new Cookie("username", username);
            cookie.setMaxAge(60*60*24*7);//一周内有效
            resp.addCookie(cookie);
            System.out.println("登录成功");
        }else {
            //登录失败
            System.out.println("登录失败");
        }
    }
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
                      http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0"
         metadata-complete="true">

    <servlet>
        <servlet-name>LoginServlet</servlet-name>
        <servlet-class>com.tian.servlet.LoginServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>LoginServlet</servlet-name>
        <url-pattern>/login</url-pattern>
    </servlet-mapping>
</web-app>