rabbitmq监听的三种方式

一:自定义监听类

@Component
public class RabbitListener implements ApplicationListener<ApplicationStartedEvent> {

@Override
    public void onApplicationEvent(ApplicationStartedEvent applicationStartedEvent) {
//spring的容器加载完成后这个方法会自动执行
//从连接里获取通道
// 自定义消费类
        DefaultConsumer consumer = new DefaultConsumer(channel) {
            public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body)
                    throws IOException {
                String message = new String(body, "UTF-8");
                try {
                  //消息处理代码
                    }
                } catch (Exception e) {
                    System.out.println(e);
                    e.printStackTrace();
                } finally {
                    // 返回接收到消息的确认信息
                    channel.basicAck(envelope.getDeliveryTag(), false);
                }
            }
        };
        // 打开消息应答机制
        channel.basicConsume(Constant.queueName, false, consumer);
}

}

二: spring 的 SimpleMessageListenerContainer类

@Bean
    public SimpleMessageListenerContainer messageListenerContainer(ConnectionFactory connectionFactory){
        SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
        container.setConnectionFactory(connectionFactory);
        //队列可以是多个，参数是String的数组
        container.setQueueNames("QueueNames");
　　　　//设置当前并发消费者数(通道数)
　　　　container.setConcurrentConsumers(5);

　　　　container.setMaxConcurrentConsumers(10);

container.setMessageListener(new ChannelAwareMessageListener(){ @Override //得到了Channel参数，具体使用会在下面的博客详细讲解 public void onMessage(Message message, Channel channel) throws Exception { System.out.println("====接收到消息====="); System.out.println(message.getMessageProperties()); System.out.println(new String(message.getBody())); } }); return container; }

 三: springboot的@RabbitListener注解

import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;

@Component
public class ConsumerBoot {
    @RabbitListener(queues = BootConfig.QUEUE_NAME)
    public void ListenerQueue(Message message){
        System.out.println("收到消息: "+new String(message.getBody()));
    }
}