struts2结合过滤器和cookie实现自动登录

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写个过滤器要对登录页面进行过滤，如果session为空，则去cookie中去寻找相关的信息，如果找到了则加载用户的信息，然后转发到登录成功的页面。我用的是struts2实现的，cookie存放用户名和Md5加密后的密码，贴代码:

1.登录页面index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%> <html> <body> <form name="form" id="form1" action="user_login.action" method="post"> 用户名: <input name="user.username" id="username" /> <br /> 密码: <input type="password" name="user.password" id="password" /> <br /> <input type="checkbox" name="autologin" value="on"> 两周内自动登录 <div> <font><font color="red"></font>${message}</font> </div> <br> <input type="submit" value="登录" /> </form> </body> </html>

2.登录成功页面welcome.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%> <html> </head> <body> 登录成功!${user.username} </body> </html>

3.User.java

package bean; public class User { private int id; private String username; private String password; public User() { } public void setPassword(String password) { this.password = password; } public String getPassword() { return password; } public void setUsername(String username) { this.username = username; } public String getUsername() { return username; } public void setId(int id) { this.id = id; } public int getId() { return id; } }

4.UserAction.java

package action; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.struts2.interceptor.ServletRequestAware; import org.apache.struts2.interceptor.ServletResponseAware; import util.DBUtil; import util.UtilCommon; import bean.User; import com.opensymphony.xwork2.ActionSupport; public class UserAction extends ActionSupport implements ServletRequestAware, ServletResponseAware { private User user; private String autologin; private HttpServletRequest request; private HttpServletResponse response; private HttpSession session; private String message; public String login() { Cookie username, password; session = request.getSession(); user.setPassword(UtilCommon.md5Encryption(user.getPassword()));//MD5加密 user=DBUtil.checkLogin(user); if (user != null) { if ("on".equals(autologin)){ // 如果用户选择了“两周内自动登录”，则向用户发送两个cookie，一个cookie记录用户名，另一个记录密码 username = new Cookie("username", user.getUsername()); username.setMaxAge(60 * 60 * 24 * 14); // 设置Cookie有效期为14天 username.setPath("/"); response.addCookie(username); password = new Cookie("password", user.getPassword()); password.setMaxAge(60 * 60 * 24 * 14); password.setPath("/"); response.addCookie(password); } session.setAttribute("user", user); } else { message = "用户名或密码错误!"; return "input"; } return "success"; } public void setServletRequest(HttpServletRequest request) { this.request = request; } public void setServletResponse(HttpServletResponse response) { this.response = response; } public String getAutologin() { return autologin; } public void setAutologin(String autologin) { this.autologin = autologin; } public User getUser() { return user; } public void setUser(User user) { this.user = user; } public void setMessage(String message) { this.message = message; } public String getMessage() { return message; } }

5.过滤器LoginFilter.java

package filter; import java.io.IOException; 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 javax.servlet.http.HttpSession; import util.DBUtil; import bean.User; public class LoginFilter implements Filter { public void destroy() { } public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest) req; HttpServletResponse response = ((HttpServletResponse) res); HttpSession session = request.getSession(true); String username, password; Cookie[] cookies; User user = (User) session.getAttribute("user"); if (user == null) { cookies = request.getCookies(); if (cookies != null && cookies.length > 0) { username = getCookieValue(cookies, "username"); password = getCookieValue(cookies, "password"); if (username != null && password != null) { user=new User(); user.setUsername(username); user.setPassword(password); user = DBUtil.checkLogin(user);// 加载用户信息 session.setAttribute("user", user); // user添加到session中。 request.getRequestDispatcher("/welcome.jsp").forward(request, response); } else { request.getRequestDispatcher("/login.jsp").forward(request, response); } } else { request.getRequestDispatcher("/login.jsp").forward(request, response); } } chain.doFilter(req, res); } public void init(FilterConfig arg0) throws ServletException { } public String getCookieValue(Cookie[] cookies, String str) { String result = null; for (Cookie cookie : cookies) { if (cookie.getName().equals(str)) { result = cookie.getValue(); break; } } return result; } }

6.数据库操作DBUtil.java

package util; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import bean.User; public class DBUtil { //取得数据库连接 public static Connection getConnection() { Connection conn = null; try { Class.forName("com.mysql.jdbc.Driver"); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); System.out.println("驱动程序没有找到" + e.getMessage()); } try { conn = DriverManager.getConnection( "jdbc:mysql://localhost:3306/cookie", "root", "123"); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); System.out.println("获得连接出错!"); } return conn; } public static User checkLogin(User user){ Connection con=null; PreparedStatement ps=null; ResultSet rs=null; String sql="select * from users where username=? and password=?"; try{ con=getConnection(); ps=con.prepareStatement(sql); ps.setString(1, user.getUsername()); ps.setString(2, user.getPassword()); rs=ps.executeQuery(); if(rs.next()){ user.setId(rs.getInt("id")); user.setUsername(rs.getString("username")); user.setPassword(rs.getString("password")); return user; } rs.close(); ps.close(); con.close(); }catch(Exception e){ e.printStackTrace(); } return null; } }

7.md5加密方法类UtilCommon.java

package util; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class UtilCommon { public static String md5Encryption(String plainText) { StringBuffer buf = new StringBuffer(""); try { MessageDigest md = MessageDigest.getInstance("MD5"); md.update(plainText.getBytes()); byte b[] = md.digest(); int i; for (int offset = 0; offset < b.length; offset++) { i = b[offset]; if (i < 0) i += 256; if (i < 16) buf.append("0"); buf.append(Integer.toHexString(i)); } } catch (NoSuchAlgorithmException e) { // TODO Auto-generated catch block e.printStackTrace(); } //return buf.toString());// 32位的加密 return buf.toString().substring(8, 24);// 16位的加密 } public static void main(String agrs[]) { System.out.println(md5Encryption("123456")); } }

8.web.xml

<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <welcome-file-list> <welcome-file>login.jsp</welcome-file> </welcome-file-list> <filter>  <filter-name>LoginFilter</filter-name>  <filter-class> filter.LoginFilter </filter-class> </filter> <filter-mapping> <filter-name>LoginFilter</filter-name> <url-pattern>*.jsp</url-pattern> </filter-mapping> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <filter> <filter-name>struts-cleanup</filter-name> <filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class> </filter> <filter-mapping> <filter-name>struts-cleanup</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>

9.struts.xml

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <constant name="struts.i18n.reload" value="true" /> <constant name="struts.devMode" value="false" /> <constant name="struts.configuration.xml.reload" value="true" /> <package name="default" extends="struts-default" namespace="/"> <action name="user_*" class="action.UserAction" method="{1}"> <result name="success">/welcome.jsp</result> <result name="input">/login.jsp</result> </action> </package> </struts>

10.数据库脚本

/* SQLyog 企业版 - MySQL GUI v8.14 MySQL - 5.6.2-m5 : Database - cookie ********************************************************************* */ /*!40101 SET NAMES utf8 */; /*!40101 SET SQL_MODE=''*/; /*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */; /*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */; /*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */; /*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */; CREATE DATABASE /*!32312 IF NOT EXISTS*/`cookie` /*!40100 DEFAULT CHARACTER SET utf8 */; USE `cookie`; /*Table structure for table `users` */ DROP TABLE IF EXISTS `users`; CREATE TABLE `users` ( `id` int(11) NOT NULL AUTO_INCREMENT, `username` varchar(50) DEFAULT NULL, `password` varchar(50) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8; /*Data for the table `users` */ insert into `users`(`id`,`username`,`password`) values (1,'zxc','49ba59abbe56e057'); /*!40101 SET SQL_MODE=@OLD_SQL_MODE */; /*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */; /*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */; /*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

工程结构图: