【JSP&Servlet】Cookie 记住用户名密码

效果展示

【JSP&Servlet】Cookie 记住用户名密码_第1张图片


首页 login.jsp

<%@ page language="java" import="java.util.*" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Login Pagetitle>
head>
    <%
        Cookie[] cookies = request.getCookies();
        Cookie remember = null;
        if (cookies != null && cookies.length > 0) {
            for (Cookie c : cookies) {
                if (c.getName().equals("remember")) {
                    remember = c;
                }
            }
        }
    %>
<body>
    <form action="/Web1.1/CookieEServlet" method="post">
    用户名:<input type="text" name="name" value="<%=remember==null?"":remember.getValue() %>"/><br/>
    密码:<input type="password" name="password" /><br/>
    记住用户名(一周):<input type="checkbox" name="remember" value="yes" <%=remember==null?"":"checked" %>/><br/>
    <input type="submit" value="登录"/><br/>
    form>
body>
html>

记住用户名Servlet CookieEServlet

package Cookie;

import java.io.IOException;
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;

/**
 * Servlet implementation class CookieEServlet
 */
@WebServlet("/CookieEServlet")
public class CookieEServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public CookieEServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1 获得用户名
        String name = request.getParameter("name");
        String remember = request.getParameter("remember");
        //新建cookie
        Cookie cookie = new Cookie("remember", name);
        //2 判断remeber
        if (remember != null && remember.equals("yes")) {
            // "yes" 勾选了 ==>  设置有效时间为 一周
            cookie.setMaxAge(60*60*24*7);
        } else {
            // null 没勾选 ==>  设置cookie的有效时间为0
            cookie.setMaxAge(0);
        }
        //3 将cookie添加到response
        response.addCookie(cookie);
        //4 跳转到成功页面
        request.getRequestDispatcher("/index.jsp").forward(request, response);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

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