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默认情况下，消费者在项目启动的时候就开始监听队列消费了，在某些特殊情况，可能需要临时关闭消费

    @Autowired
    private RabbitTemplate rabbitTemplate;
    
    /**
     * 发送消息
     *
     * @author 蔡定努
     */
    @GetMapping
    public boolean aa() {
         rabbitTemplate.convertSendAndReceive("name", "123");
        return true;
    }

    /**
     * 消息监听
     */
    @RabbitListener(id = "con", bindings = @QueueBinding(
            value = @Queue(name = "name"),
            exchange = @Exchange("ex"),
            key = "ex"),
            concurrency = "3", ackMode = "AUTO"
    )
    public void ack(String name con() throws InterruptedException {
        log.info("---收到消息-----");
        sleep(10000);
    }


    @Autowired
    private RabbitListenerEndpointRegistry rabbitListenerEndpointRegistry;

    /**
     * 开启/关闭单个消费者
     */
    @GetMapping("switchConsumer/{queueId}/{flag}")
    public void switchConsumer(@PathVariable("queueId") String queueId, @PathVariable(value = "flag") Boolean flag) {
       // Collection<MessageListenerContainer> listenerContainers = rabbitListenerEndpointRegistry.getListenerContainers();
       //  for (MessageListenerContainer listenerContainer : listenerContainers) {
       //      listenerContainer.stop();
       //  }
       //

        MessageListenerContainer listenerContainer = rabbitListenerEndpointRegistry.getListenerContainer(queueId);
        Optional.ofNullable(listenerContainer).ifPresent(messageListenerContainer -> {
            if (flag) {
                messageListenerContainer.start();
                log.info("消费者开启");
            } else {
                messageListenerContainer.stop();
                log.info("消费者关闭");
            }
        });
    }