在sprinb-boot的interceptor中用 @Reference注入dubbo服务，但是为空。

[cy503328434]

public class CustomInterceptor implements HandlerInterceptor {
@reference(version = "1.0.0")
private SessionProvider sessionProvider;

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
        throws Exception {
    log.info("CustomInterceptor preHandle start.");
    //用户必须登录 
    String uername = sessionProvider.getAttributeForUser(RequestUtil.getCSESSIONID(request, response));
    //未登录
    if (StringUtils.isBlank(uername)) {
        return false;
    }
    log.info("CustomInterceptor preHandle end.");
    return true;
}

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                       ModelAndView modelAndView)
        throws Exception {
    log.info("CustomInterceptor postHandle.");
}

@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
        throws Exception {
    log.info("CustomInterceptor afterCompletion.");
}

}

[ExpoBailey]

应该是消费者的扫描包没有扫到这个拦截器的目录，而且拦截器不能手动new喔：
spring.dubbo.scan=要包括这个拦截器的包