session超时后跳转的问题?

过期时能在HttpSessionListener的sessionDestroyed方法中可以得到mangerLevel
public void sessionDestroyed(HttpSessionEvent se) {
HttpSession session = se.getSession();
LoginForm loginForm=(LoginForm)session.getAttribute("loginForm");
System.out.println(loginForm.getManagerLevel());  //打印出9
session.setAttribute("mlFlag", loginForm.getManagerLevel());
}
当点击包含".do"的请求时怎么才能到Filter中的request.gerSession中获得“mlFlag”
if (url.indexOf(".do") >= 0 )
        {

            HttpSession session = ((HttpServletRequest) request).getSession(true);
            if (session.getAttribute("loginForm") == null)
            {
            String managerLevel = (String)session.getAttribute("mlFlag");
            System.out.println(managerLevel + "------------------"); //总为null,怎样在这里获得sessionDestroyed方法中设置的“mlFlag”的值？
            if ( "9".equals(managerLevel)){
            hrep.sendRedirect(hreq.getContextPath() + "/timeout.jsp?managerLevelFlag=" + managerLevel);
            }else {
            hrep.sendRedirect(hreq.getContextPath() + "/timeout.jsp?managerLevelFlag=-1");
            }
            }
            else
            {
                chain.doFilter(request, response);
            }
        }
可能本人对Filter，Listener相结合操作没理解好，要实现这种功能有什么好方法？
谢谢各位！
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