记住我的功能主要是cookie的一个应用，功能实现中要注意的是，对保存的中文时乱码的处理及cookie的保存路径设置。
登录页面login.jsp:
<%@page import="java.net.URLDecoder"%> <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; String password=""; String name=""; String checked=""; Cookie[] cookies = request.getCookies(); //取出cookie对象组 for(int i = 0; cookies != null && i < cookies.length;i++){ Cookie cookie = cookies[i]; // 取出其中的一个对象，含有name ,value if(cookie != null && "name".equals(cookie.getName())){ //获取第一个cookie对象的name name = URLDecoder.decode(cookie.getValue(), "UTF-8");//进行解码 checked = "checked"; } if(cookie != null && "password".equals(cookie.getName())){ password = cookie.getValue(); } } %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'login.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <form action="system/testajax_cookie.do" method="POST"> 用户名：<input name="name" value="<%=name%>"/><br> 密 码：<input type="password" name="password" value="<%=password%>"/><br> 记住我：<input type="checkbox" name="remember" value="yes" <%=checked%>/><br> <input type="submit" value="submit"/><br> </form> </body> </html>
MyUtil.java:
package cn.itcast.elec.web.action; import java.io.UnsupportedEncodingException; import java.net.URLEncoder; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class MyUtil { public static void remember(HttpServletRequest request,HttpServletResponse response){ String name = request.getParameter("name"); //获取用户名 String password = request.getParameter("password"); //获取密码 String remember = request.getParameter("remember"); //获取是否打钩 String codeName=""; try { codeName = URLEncoder.encode(name, "UTF-8"); //对输入的中文进行编码，防止乱码出现 } catch (UnsupportedEncodingException e) { e.printStackTrace(); } Cookie nameCookie = new Cookie("name", codeName); Cookie passwordCookie = new Cookie("password", password); nameCookie.setPath(request.getContextPath()+"/"); //设置Cookie的有效路径 passwordCookie.setPath(request.getContextPath()+"/");//设置Cookie的有效路径 if(remember != null && "yes".equals(remember)){ //有记住我，就设置cookie的保存时间 nameCookie.setMaxAge(7*24*60*60); passwordCookie.setMaxAge(7*24*60*60); }else{ //没有记住我，设置cookie的时间为0 nameCookie.setMaxAge(0); passwordCookie.setMaxAge(0); } response.addCookie(nameCookie); response.addCookie(passwordCookie); } }