效果展示
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); } }