springboot整合rabbitmq入门(二)

今天继续介绍一种rabbitmq的模式-topic模式

创建queue和exchange

@Configuration
public class TopicRabbitConfig {

    @Bean
    public Queue topicA(){
        return new Queue("topicA");
    }

    @Bean
    public Queue topicB(){
        return new Queue("topicB");
    }

    @Bean
    public TopicExchange topicExchange(){
        return new TopicExchange("topicExchange");
    }

    @Bean
    Binding BindTopicA(Queue topicA, TopicExchange topicExchange){
        return BindingBuilder.bind(topicA).to(topicExchange).with("topic.message");
    }

    //*表示一个词,#表示零个或多个词

    /**
     *
     * @param topicB
     * @param topicExchange
     * *表示一个词,#表示零个或多个词
     * @return
     */
    @Bean
    Binding BindTopicB (Queue topicB, TopicExchange topicExchange){
        return  BindingBuilder.bind(topicB).to(topicExchange).with("topic.#");
    }
}

需要注意的是：topic中的routingKey支持模糊匹配， topic.message表示只能监听到routingKey为topic.messaged的消息

topic.*和topic.#区别是：topic.*表示只能监听到topic.xxx的消息，而不能监听到topic.xxx.xxx的消息

发送端：

@Component
public class TopicSend {

    @Autowired
    private RabbitTemplate rabbitTemplate;

    public void send(){
        String context = "测试Topic";
        System.out.println("send"+context);
        this.rabbitTemplate.convertAndSend("topicExchange","topic",context);
    }
}

两个消费端：

@Component
@RabbitListener(queues = "topicA")
public class TopicReceiveA {

    @RabbitHandler
    public void receive(String content){
        System.out.println("TopicA"+content);
    }
}

@Component
@RabbitListener(queues = "topicB")
public class TopicReceiveB {

    @RabbitHandler
    public void receive(String content){
        System.out.println("TopicB"+content);

    }
}

控制台打印：因为我们routingKey是topic，所以只能B对列消费到消息

我们吧routingKey改为topic.message，会发现A和B两个消费端都可以接受到消息