Struts2与Cookie实现自动登录！

一、本文主要介绍struts2与cookie结合实现自动登录

struts2与cookie结合时要注意采用.action 动作的方式实现cookie的读取。好了直接看代码：
首先是struts2的配置文件：struts.xml
该配置文件，用户验证成功跳转到success.jsp页面。验证失败跳转到Login.jsp页面
项目下载地址：http://download.csdn.net/source/3477755

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<span style="font-size:24px;"><?xml version="1.0" encoding="UTF-8" ?>  
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">  
<struts>  
    <constant name="struts.i18n.encoding" value="GBK" />  
    <package name="user" namespace="/user" extends="struts-default">  
        <!-- 用户登录 -->  
        <action name="login" class="cn.edu.pdsu.action.LoginAction">  
            <result name="success" type="redirect">/success.jsp</result>  
            <result name="login">/login.jsp </result>  
        </action>  
    </package>  
</struts></span>  

接着是action文件，LoginAction.java

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<span style="font-size:18px;">package cn.edu.pdsu.action;  
  
import java.util.Map;  
  
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 org.apache.struts2.interceptor.SessionAware;  
  
import cn.edu.pdsu.bean.User;  
import cn.edu.pdsu.dao.UserDao;  
import cn.edu.pdsu.utils.CookieUtils;  
  
import com.opensymphony.xwork2.ActionSupport;  
  
public class LoginAction extends ActionSupport implements ServletRequestAware,  
        ServletResponseAware, SessionAware {  
    private static final long serialVersionUID = 6650955874307814247L;  
    public static final String USER_SESSION = "user.session";  
    private HttpServletResponse response;  
    private HttpServletRequest request;  
    private Map<String, Object> session;  
    private CookieUtils cookieUtils = new CookieUtils();  
    private UserDao userDao = new UserDao();  
    private String username;  
    private String password;  
    private boolean userCookie;  
  
    // 用户登录跳转  
    public String login() {  
        if (cookieUtils.getCookie(request, userDao)) {  
            return SUCCESS;  
        } else  
            return "login";  
    }  
  
    @Override  
    // 正常登录  
    public String execute() throws Exception {  
        System.out.println(username + "\t" + password + "\t" + userCookie);  
        String username = getUsername().trim();  
        if (username != null && !"".equals(username) && password != null  
                && !"".equals(password)) {  
            User user = userDao.checkUser(username, password);  
            System.out.println(user);  
            if (user != null) {  
                // 判断是否要添加到cookie中  
                if (userCookie) {  
                    Cookie cookie = cookieUtils.addCookie(user);  
                    response.addCookie(cookie);// 添加cookie到response中  
                }  
                // 2.将user 设置到session中  
                session.put(USER_SESSION, user);  
                return SUCCESS;  
            }  
        }  
        this.addFieldError("username", "用户名或密码错误!");  
        return "login";  
    }  
  
    // 用户退出  
    public String logout() {  
        HttpSession session = request.getSession(false);  
        if (session != null)  
            session.removeAttribute(USER_SESSION);  
        Cookie cookie = cookieUtils.delCookie(request);  
        if (cookie != null)  
            response.addCookie(cookie);  
        return "login";  
    }  
  
    public boolean getUserCookie() {  
        return userCookie;  
    }  
  
    public void setUserCookie(boolean userCookie) {  
        this.userCookie = userCookie;  
    }  
  
    public String getUsername() {  
        return username;  
    }  
  
    public void setUsername(String username) {  
        this.username = username;  
    }  
  
    public String getPassword() {  
        return password;  
    }  
  
    public void setPassword(String password) {  
        this.password = password;  
    }  
  
    public void setServletResponse(HttpServletResponse response) {  
        this.response = response;  
    }  
  
    public void setSession(Map<String, Object> session) {  
        this.session = session;  
    }  
  
    public void setServletRequest(HttpServletRequest request) {  
        this.request = request;  
    }  
  
}  
</span>  

接下来是cookie工具类，主要是cookie的添加、删除与查询。CookieUtils.java

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package cn.edu.pdsu.utils;  
  
import javax.servlet.http.Cookie;  
import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpSession;  
  
import org.apache.commons.lang.StringUtils;  
  
import cn.edu.pdsu.action.LoginAction;  
import cn.edu.pdsu.bean.User;  
import cn.edu.pdsu.dao.UserDao;  
  
/** 
 * cookie的增加、删除、查询 
 */  
public class CookieUtils {  
    public static final String USER_COOKIE = "user.cookie";  
  
    // 添加一个cookie  
    public Cookie addCookie(User user) {  
        Cookie cookie = new Cookie(USER_COOKIE, user.getUsername() + ","  
                + user.getPassword());  
        System.out.println("添加cookie");  
        cookie.setMaxAge(60 * 60 * 24 * 14);// cookie保存两周  
        return cookie;  
    }  
  
    // 得到cookie  
    public boolean getCookie(HttpServletRequest request, UserDao userDAO) {  
        Cookie[] cookies = request.getCookies();  
        System.out.println("cookies: " + cookies);  
        if (cookies != null) {  
            for (Cookie cookie : cookies) {  
                System.out.println("cookie: " + cookie.getName());  
                if (CookieUtils.USER_COOKIE.equals(cookie.getName())) {  
                    String value = cookie.getValue();  
                    if (StringUtils.isNotBlank(value)) {  
                        String[] split = value.split(",");  
                        String username = split[0];  
                        String password = split[1];  
                        User user = userDAO.checkUser(username, password);  
                        if (user != null) {  
                            HttpSession session = request.getSession();  
                            session.setAttribute(LoginAction.USER_SESSION, user);// 添加用户到session中  
                            return true;  
                        }  
                    }  
                }  
            }  
        }  
        return false;  
    }  
  
    // 删除cookie  
    public Cookie delCookie(HttpServletRequest request) {  
        Cookie[] cookies = request.getCookies();  
        i
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f (cookies != null) {  
            for (Cookie cookie : cookies) {  
                if (USER_COOKIE.equals(cookie.getName())) {  
                    cookie.setValue("");  
                    cookie.setMaxAge(0);  
                    return cookie;  
                }  
            }  
        }  
        return null;  
    }  
}  

接着上的是用户信息验证类，UserDao.java

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package cn.edu.pdsu.dao;  
  
import cn.edu.pdsu.bean.User;  
  
/** 
 * 用户的有效性校验 
 */  
public class UserDao {  
  
    // 模拟查找用户  
    public User checkUser(String username, String password) {  
        if (username.equals("hello") && password.equals("123")) {  
            User user = new User();  
            user.setUsername("hello");  
            user.setPassword("123");  
            return user;  
        }  
        return null;  
    }  
  
}  

接着就是用户登录页面，login.jsp

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<span style="font-size:18px;"><%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>  
<%@taglib prefix="s" uri="/struts-tags" %>  
<%  
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>登录页面</title>  
  </head>  
  <body>  
   <center>  
   <s:form action="login" namespace="/user" method="post">  
   <s:textfield label="用户名" name="username"></s:textfield>  
   <s:password label="密码" name="password"></s:password>  
   <s:checkbox label="自动登录" name="userCookie" value="true"></s:checkbox>  
   <s:submit value="提交"></s:submit>  
   </s:form>  
   </center>  
  </body>  
</html>  
</span>  

接着是index.jsp页面

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<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>  
<%  
String path = request.getContextPath();  
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";  
response.sendRedirect(basePath+"user/login!login.action");  
%>  

登录成功页面success.jsp

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<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>  
<%@taglib prefix="s" uri="/struts-tags" %>  
<%  
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>登录成功！</title>  
  </head>  
  <body>  
    <h1>欢迎您的到来！</h1><br>  
    <s:a action="login!logout.action" namespace="/user"> 安全退出</s:a>  
  </body>  
</html>  

项目下载地址：http://download.csdn.net/source/3477755