struts2拦截器获取HTTPsession失败

Struts2拦截session用Filter
例:package com.utils;import java.io.IOException;
import java.util.Map;import javax.annotation.Resource;
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 org.apache.log4j.Logger;
import org.apache.struts2.ServletActionContext;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;import com.cheater.init.service.InitService;
import com.cheater.init.service.InitServiceImpl;
import com.cheater.model.User;/**
*
* @Date: 2013-12-13 下午4:59:27
* @Author: Gyh
* @TODO: 系统权限过滤器（未登录用户不允许访问某些功能）
*/
public class PrivilegeFilter implements Filter {
WebApplicationContext context;
private static Logger logger = Logger.getLogger(LogAspect.class);
@Override
public void destroy() {
} @Override
public void doFilter(ServletRequest arg0, ServletResponse arg1,FilterChain arg2) throws IOException, ServletException {
doBeforeFilter(arg0);//判断是否保存有登录信息
try {
HttpServletRequest request = (HttpServletRequest) arg0;
HttpServletResponse response = (HttpServletResponse) arg1;
User user = (User) request.getSession().getAttribute(Constants.USER);

String action = request.getServletPath();//action名
System.out.println("调用的action:"+action);
if(null!=request.getQueryString())
System.out.println("传递的参数："+request.getQueryString());
//String params=request.getQueryString();//后面的参数
Map<String,String>acceptedAction=Constants.ACCEPTED_ACTION;
if (null==user&&acceptedAction.containsKey(action)){
response.sendRedirect(request.getContextPath()
+ "/init_login.action");
}
else{
arg2.doFilter(request, response);
}
} catch (Exception e) {
e.printStackTrace();
}
} private void doBeforeFilter(ServletRequest request) {
HttpSession session = ((HttpServletRequest) request).getSession(true);
        //首先检查session，若已经登陆则直接忽略以下代码
        if (session.getAttribute(Constants.USER) != null) {
            return;
         }             Cookie[] cookies = ((HttpServletRequest) request).getCookies();
         String email = null;
         String password = null;
        if (cookies != null) {
            for (Cookie c : cookies) {
                if (c.getName().equals("email")) {
                 email = c.getValue();
                 }
                if (c.getName().equals("pass")) {
                     password = c.getValue();
                 }
             }
            context=WebApplicationContextUtils.getWebApplicationContext(session.getServletContext());
          //获取spring bean
            InitService initService = (InitService) context.getBean("initService");
            User user=initService.getUser(email, password);
            if (user!=null) {
         logger.info(user.getEmail()+" 通过COOKIE登录..");
                 session = ((HttpServletRequest) request).getSession(true);
                 session.setAttribute(Constants.USER,user);
             }
         }
} @Override
public void init(FilterConfig arg0) throws ServletException {
}
}
我用Filter写了一个登录过滤器，session还是获取不了。然后我又检查了其他的session使用，都可以，唯独在ACTION里面的session设置后，在其他任何地方都无法获取session。
一个过滤写这么麻烦直接用javax.servlet.Filter;这个接口

调试易

struts2拦截器获取HTTPsession失败

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