RabbitMQ中@RabbitListener注解使用pull模式该怎么设置

RabbitMQ的@RabbitListener注解默认使用push模式，但也可以设置为pull模式。在使用pull模式时，需要将containerType属性设置为SimpleMessageListenerContainer，并配置acknowledgeMode为MANUAL。

示例代码如下：

@RabbitListener(
    id = "myListener",
    containerFactory = "myContainerFactory",
    bindings = @QueueBinding(
        value = @Queue(value = "myQueue"),
        exchange = @Exchange(value = "myExchange", type = "topic"),
        key = "myKey"
    ),
    containerType = SimpleMessageListenerContainer.class,
    acknowledgeMode = AcknowledgeMode.MANUAL
)
public void handleMessage(Message message, Channel channel) throws IOException {
    // 处理消息
    channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
}

其中，myContainerFactory是自定义的SimpleRabbitListenerContainerFactory实例。在该实例中，可以设置prefetchCount属性，以控制每次从消息队列拉取的消息数量。例如：

@Bean
public SimpleRabbitListenerContainerFactory myContainerFactory(ConnectionFactory connectionFactory) {
    SimpleRabbitListenerContainerFactory factory = new SimpleRabbitListenerContainerFactory();
    factory.setConnectionFactory(connectionFactory);
    factory.setAcknowledgeMode(AcknowledgeMode.MANUAL);
    factory.setPrefetchCount(10); // 每次从队列中拉取10条消息
    return factory;
}