Rabbit

安装配置参考：https://blog.csdn.net/qq_31634461/article/details/79377256

概念学习参考(纯洁的微笑)：https://www.cnblogs.com/ityouknow/p/6120544.html

---

RabbitMQ的hello world(基于Spring Boot)

1.配置文件

spring.application.name=rabbitMQ

spring.rabbitmq.host=127.0.0.1
spring.rabbitmq.port=5672
spring.rabbitmq.username=guest
spring.rabbitmq.password=guest

2.配置队列

@Configuration
public class RabbitMQConfig {

    @Bean
    public Queue queue() {
　　　　 //队列名称，后面生产者根据此队列名称发送消息，消费者也监听此名称
        return new Queue("hello");
    }
}

3.生产者

@Component
public class RabbitMQSender {
    //AmqpTemplate接口，spring boot会去实现它
    @Autowired
    private AmqpTemplate rabbitTemplate;

    public void send() {
        String info = "hello RabbitMQ!";
        System.out.println("send:" + info);
        //参数"hello"对应队列的名称
        rabbitTemplate.convertAndSend("hello", info);
    }
}

4.消费者

@Component
@RabbitListener(queues="hello") //监听队列"hello"
public class RabbitMQReceiver {
    
　　 //调用队列的信息，参数hello既是消费的信息；
    @RabbitHandler
    public void receive(String hello) {
        System.out.println("receive:" + hello);
    }
}

5.test

@RunWith(SpringRunner.class)
@SpringBootTest
public class RabbitMqApplicationTests {

    @Autowired
    private RabbitMQSender rabbitMQSender;

    @Test
    public void contextLoads2() {
        rabbitMQSender.send();
    }
}

结果：

send:hello RabbitMQ!
receive:hello RabbitMQ!

---

RabbitMQ的交换机与Topic

交换机的作用是接收消息，并转发到绑定的队列，四种类型：Direct, Topic, Headers and Fanout

最灵活的就是Topic

给队列绑定routing_key(路由key)，发送消息时，就根据发送消息传回的参数去匹配这个routing_key，然后根据匹配情况把消息分配到对应的消息队列中