Interceptor中設置request參數問題

爲了驗證身份，寫了一個interceptor,驗證失敗就dispatch到messagePage.jsp,messagePage.jsp是遺留系統的頁面不能改動：

public class AuthInterceptor extends MethodFilterInterceptor {


    protected String doIntercept(ActionInvocation invocation) throws Exception {

        ActionContext ctx = invocation.getInvocationContext();
        HttpServletRequest request = (HttpServletRequest)ctx.get(ServletActionContext.HTTP_REQUEST);
        HttpSession session = request.getSession();
                UserBean user = (UserBean) session.getAttribute("currentUser");
        if (null == user)  {
            request.setAttribute("param1", "index.jsp");
            request.setAttribute("param2", new Integer(111));
            return Action.ERROR;

        }


        return invocation.invoke();

    }


}

public class AuthInterceptor extends MethodFilterInterceptor {


	protected String doIntercept(ActionInvocation invocation) throws Exception {

		ActionContext ctx = invocation.getInvocationContext();
		HttpServletRequest request = (HttpServletRequest)ctx.get(ServletActionContext.HTTP_REQUEST);
		HttpSession session = request.getSession();
		 		UserBean user = (UserBean) session.getAttribute("currentUser");
		if (null == user)  {
			request.setAttribute("param1", "index.jsp");
			request.setAttribute("param2", new Integer(111));
 			return Action.ERROR;
			
		}
	     
		
		return invocation.invoke();
	
	}
	

}

設置缺省的interceptor-stack

<interceptors>
        <interceptor name="auth" class="com.mice.AuthInterceptor"/>
        <interceptor-stack name="miceStack">

            <interceptor-ref name="defaultStack"/>
            <interceptor-ref name="auth"/>
        </interceptor-stack>
               </interceptors>
<default-interceptor-ref name="miceStack"/>

< global-results>
        <result name="error">/messagePage.jsp</result>
      </global-results>

<interceptors>
	 	<interceptor name="auth" class="com.mice.AuthInterceptor"/>
	 	<interceptor-stack name="miceStack">
	 		
	 		<interceptor-ref name="defaultStack"/>
	 		<interceptor-ref name="auth"/>
	 	</interceptor-stack>
        	   </interceptors>
<default-interceptor-ref name="miceStack"/>

< global-results>
 		<result name="error">/messagePage.jsp</result>
 	  </global-results>

但是在messagePage.jsp中，request.getAttribute取不到param1和param2, 請問有什麼辦法可以在interceptor中設置HttpServeletRequest的參數？