老师在springboot中MQConfig并没有注册ConnectionFactory就可以读取application.properties中关于rabbitMQ的配置属性，如果是使用spring-mvc通过注解的方式配置MQConfig是不是就得注册ConnectionFactory来读取其配置属性？

@Bean
public ConnectionFactory connectionFactory() {
   CachingConnectionFactory connectionFactory = new CachingConnectionFactory(this.rabbitmq.host,this.mqRabbitPort);

   connectionFactory.setUsername(this.mqRabbitUserName);
   connectionFactory.setPassword(this.mqRabbitPassword);
   connectionFactory.setVirtualHost(this.mqRabbitVirtualHost);
   connectionFactory.setPublisherConfirms(true);

   return connectionFactory;
}