【JSP&Servlet】Cookie 记住用户名密码

来源：互联网发布：超市叫卖软件编辑：程序博客网时间：2024/06/13 18:39

效果展示

记住用户名

首页 login.jsp

<%@ page language="java" import="java.util.*" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Login Page</title></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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