nutzWk微服务里 实体类里如何获得用户uid

public String uid() {
        String uid = getOpBy();
        if (Strings.isNotBlank(uid)) {
            return uid;
        }
        try {
            HttpServletRequest request = Mvcs.getReq();
            if (request != null) {

                return Strings.sNull(request.getSession(true).getAttribute("uid"));
            }
        } catch (Exception e) {
        }
        return "";
    }

request 是空的