Login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

      <title>登录</title>

  </head>

  <body>

      <form action="LoginServlet" method="post">

        账号：<input type="text" name="account"/><br/>

        密码：<input type="password" name="password"/><br/>

        有效期： <input type="radio" name="cookie" value="true"/>    30天内失效<br/>

        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<input type="submit" value="登录"/><br/>

      </form>

  </body>

</html>

welcome.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    <title>My JSP 'welcome.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>

    <h1>30天内自动登陆</h1><hr>

    <c:if test="${sessionScope.account == null}">

        游客!

        <a href="Login.jsp">登录</a>

    </c:if>

    <c:if test="${sessionScope.account != null}">

        欢迎回来,${sessionScope.account }

        <a href="InvalidateServlet">注销</a>

    </c:if>

  </body>

</html>

User,UserDao,DBHelper同之前

LoginServlet

package com.cn.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.Cookie;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import com.cn.dao.UserDao;

public class LoginServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        this.doPost(request, response);

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");

        HttpSession session = request.getSession();

        String account = request.getParameter("account");

        String password = request.getParameter("password");

        UserDao userDao = new UserDao();

        Boolean user = userDao.queryUser(account, password);

        if(user){

            request.getSession().setAttribute("account", account);

            if("true".equals(request.getParameter("cookie"))){

                Cookie cookie = new Cookie("cookie",account+":"+password);

                cookie.setPath(request.getContextPath());

                cookie.setMaxAge(3600*24*30);

                response.addCookie(cookie);

            }

            response.sendRedirect("welcome.jsp");

        }else{

            response.setContentType("text/html;charset=utf-8");

            PrintWriter pw = response.getWriter();

            pw.print("<script> window.onload=function(){alert('对不起账号或者密码不正确');}</script>");

        }

    }

}

InvalidateServlet

package com.cn.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.Cookie;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

public class InvalidateServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        this.doPost(request, response);

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

          if(request.getSession(false)!=null){

                request.getSession().invalidate();  

                //删除自动登录 cookie

                Cookie cookie = new Cookie("cookie", "");

                cookie.setPath(request.getContextPath());

                cookie.setMaxAge(0);

                response.addCookie(cookie);

            }

            response.sendRedirect("welcome.jsp");

    }

}

CookieFilter

package com.cn.filter;

import java.io.IOException;

import java.sql.SQLException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.http.Cookie;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.cn.dao.UserDao;

import com.cn.pojo.User;

public class CookieFilter implements Filter {

    public void doFilter(ServletRequest request, ServletResponse response,

            FilterChain chain) throws IOException, ServletException {

        HttpServletRequest req = (HttpServletRequest) request;

        HttpServletResponse resp = (HttpServletResponse) response;  

        //1.只有未登录的用户才能自动登陆

        if(req.getSession(false)==null || req.getSession().getAttribute("account")==null){  

            //2.只有带了自动登陆cookie的用户才能自动登陆

            Cookie [] cs = req.getCookies();

            Cookie findC = null;

            if(cs!=null){

                for(Cookie c : cs){

                    if("cookie".equals(c.getName())){

                        findC = c;

                        break;

                    }

                }

            }  

            if(findC!=null){

                //3.自动登录Cookie中保存的用户名密码都需要是正确的才能自动登陆

                String account = findC.getValue().split(":")[0];

                String password= findC.getValue().split(":")[1];

                UserDao userDao = new UserDao();

                Boolean user = userDao.queryUser(account, password);

                if(user){

                    req.getSession().setAttribute("account", account);

                }

            }

        }

        //无论是否自动登陆,都放行资源

        chain.doFilter(request, response);

    }

    public void destroy() {

        // TODO Auto-generated method stub

    }

    public void init(FilterConfig arg0) throws ServletException {

        // TODO Auto-generated method stub

    }

}

web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

  <display-name>jspT2</display-name>

  <servlet>

    <description>This is the description of my J2EE component</description>

    <display-name>This is the display name of my J2EE component</display-name>

    <servlet-name>LoginServlet</servlet-name>

    <servlet-class>com.cn.servlet.LoginServlet</servlet-class>

  </servlet>

  <servlet>

    <description>This is the description of my J2EE component</description>

    <display-name>This is the display name of my J2EE component</display-name>

    <servlet-name>InvalidateServlet</servlet-name>

    <servlet-class>com.cn.servlet.InvalidateServlet</servlet-class>

  </servlet>

  <servlet-mapping>

    <servlet-name>LoginServlet</servlet-name>

    <url-pattern>/LoginServlet</url-pattern>

  </servlet-mapping>

  <servlet-mapping>

    <servlet-name>InvalidateServlet</servlet-name>

    <url-pattern>/InvalidateServlet</url-pattern>

  </servlet-mapping>

  <filter>

      <filter-name>CookieFilter</filter-name>

      <filter-class>com.cn.filter.CookieFilter</filter-class>

  </filter>

  <filter-mapping>

      <filter-name>CookieFilter</filter-name>

      <url-pattern>/*</url-pattern>

  </filter-mapping>

  <welcome-file-list>

    <welcome-file>index.html</welcome-file>

    <welcome-file>index.htm</welcome-file>

    <welcome-file>index.jsp</welcome-file>

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.htm</welcome-file>

    <welcome-file>default.jsp</welcome-file>

  </welcome-file-list>

</web-app>

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