如果没登录,我想响应一个401状态码,这么写可以码?还是return nutz提供的?

@Filters
public class CheckSession implements ActionFilter {


    public View match(ActionContext actionContext) {
        HttpServletRequest re = actionContext.getRequest();
        Integer user_id = (Integer) re.getSession().getAttribute("user_id");
        if(user_id == null){
            HttpServletResponse response = actionContext.getResponse();
            try {
                response.sendError(401,"您还没登录!");
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
}