在hotel-demo中的cn.itcast.hotel.mq包新增一个类: packagecn.itcast.hotel.mq;importcn.itcast.hotel.constants.MqConstants;importcn.itcast.hotel.service.IHotelService;importorg.springframework.amqp.rabbit.annotation.RabbitListener;importorg.springframework.beans.factory.annotation.Autowired;importorg.springframe...