Struts2 自動登錄的攔截器

package org.wiyi.bbs.Interceptor;

import java.util.Map;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.wiyi.bbs.model.User;
import org.wiyi.bbs.service.UserService;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;

public class AutoLoginInterceptor implements Interceptor{

	private static final long serialVersionUID = -3622290057856883830L;

	@Override
	public void destroy() {
		
	}

	@Override
	public void init() {
		System.out.println("攔截到http請求") ;
	}

	@Override
	public String intercept(ActionInvocation invocation) throws Exception {
		
		HttpServletRequest request = ServletActionContext.getRequest() ;
		Cookie[] cookies = request.getCookies() ;
		ActionContext atx = invocation.getInvocationContext() ;
		Map<String,Object> session = atx.getSession() ;
		
		if(session.get("user") == null) {
			System.out.println("----開始自動登錄----") ;
			if(cookies != null) {
				for(Cookie cookie : cookies) {
					if(cookie.getName().equals("autoLogin"))  {
						String[] value = cookie.getValue().split("_") ;
						int userId = Integer.parseInt(value[0]) ;
						long expireTime = Long.parseLong(value[1]) ;
						
						UserService userService = getUserService() ;
						User user = userService.loadUser(userId) ;
						System.out.println(user) ;
						if(user.getAutoLoginKey().equals(cookie.getValue()) 
								&& expireTime > System.currentTimeMillis()) {
							
							session.put("user", user) ;
						}
						
						System.out.println("-----自動登錄成功-----") ;
						break ;
					}
				}
			}
			
		}
		
		return invocation.invoke();
	}

	private UserService getUserService() {
		ApplicationContext atx = new ClassPathXmlApplicationContext("applicationContext.xml") ;
		UserService userService = (UserService) atx.getBean("userServiceImpl") ;
		
		return userService;
	}
	
}