用户免用户名登陆
1、servlet代码
package com.qbb.web;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* @author QiuQiu&LL
* @create 2021-01-12 17:46
* @Description:
*/
@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet {
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
if("Qbb".equalsIgnoreCase(username) && "123".equalsIgnoreCase(password)){
// 登录成功，用户名保存到Cookie中
Cookie cookie = new Cookie("username", username);
cookie.setMaxAge(60*60);
response.addCookie(cookie);
response.getWriter().write("success!");
}else {
// 登录失败
response.sendRedirect(request.getContextPath()+"/login.jsp");
}
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}
2、login.jsp页面代码
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>登录页面</title>
</head>
<body>
<form action="http://localhost:8080/cookie_session/loginServlet" method="post">
用户名：<input type="username" name="username" value="${cookie.username.value}"><br>
密码：<input type="password" name="password" value=""><br>
<input type="submit" value="登录">
</form>
</body>
</html>原文：https://www.cnblogs.com/ybbit/p/14268645.html