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

<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

<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

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();
        if (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

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

<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

<%@ 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

<%@ 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>