MQ

MQ相关技术对比

RabbitMQ

SpringAMQP介绍

SpringAMQP实现基础消息队列功能

1. 父工程引入依赖

<!--AMQP依赖，包含RabbitMQ-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-amqp</artifactId>
</dependency>

2. publisher中application.yml添加mq连接信息以及代码实例

spring:
  rabbitmq:
    host: 43.143.131.78   # rabbitMQ的ip地址
    port: 5672   #rabbitMQ的端口
    username: itcast
    password: 123321
    virtual-host: /

@RunWith(SpringRunner.class)
@SpringBootTest
public class PublisherTest {
    @Autowired
    private RabbitTemplate rabbitTemplate;

    @Test
    public void testSendMessage() throws IOException, TimeoutException {
        String queueName = "simple.queue";
        String message = "hello, spring amqp!";
        rabbitTemplate.convertAndSend(queueName, message);
    }
}

3. 在consumer中编写消费逻辑，监听sample.queue

spring:
  rabbitmq:
    host: 43.143.131.78   # rabbitMQ的ip地址
    port: 5672   #rabbitMQ的端口
    username: itcast
    password: 123321
    virtual-host: /

@Component
public class SpringRabbitListener {

    @RabbitListener(queues = "simple.queue")
    public void listenSimpleQueue(String msg) {
        System.out.println(msg);
    }
}

eg: work queue

业务场景:

发布订阅模型

1. fanout exchange
   1.1 概念
   
   1.2 实现
   步骤一 声明exchange, queue, binding：
   

@Configuration
public class FanoutConfig {
    // 交换机声明
    @Bean
    public FanoutExchange fanoutExchange() {
        return new FanoutExchange("itcast.fanout");
    }
    // 声明队列
    @Bean
    public Queue fanoutQueue1() {
        return new Queue("fanout.queue1");
    }
    // 绑定队列1到交换机
    @Bean
    public Binding fanoutBinding1(Queue fanoutQueue1, FanoutExchange fanoutExchange) {
        return BindingBuilder
                .bind(fanoutQueue1)
                .to(fanoutExchange);
    }
}

步骤二 声明消费者
步骤三 发送消息给exchange:

String exchangeName = "itcast.fanout";
String message = "hello, message";
rabbitTemplate.convertAndSend(exchangeName, "", message);

1.3 总结

2. DirectExchange
2.1 介绍

2.2 实现
这次使用@RabbitListener实现(较为方便)
consumer

@RabbitListener(bindings = @QueueBinding(
        value = @Queue(name = "direct.queue1"),
        exchange = @Exchange(name = "itcast.direct", type = ExchangeTypes.DIRECT),
        key = {"red", "blue"}
))
public void ListenDirectQueue1(String msg) {
    System.out.println("消费者1" + msg);
}

publisher

rabbitTemplate.convertAndSend(exchangeName, "red", message);

3. Topic Exchange
   3.1 介绍
   
   3.2 实现
   consumer

@RabbitListener(bindings = @QueueBinding(
        value = @Queue(name = "topic.queue1"),
        exchange = @Exchange(name = "itcast.topic"),
        key = "china.#"
))
public void ListenTopicQueue1(String msg) {
    System.out.println("china---" + msg);
}

publisher

@Test
public void testSendMessage() throws IOException, TimeoutException, InterruptedException {
    String exchangeName = "itcast.topic";
    String message = "hello, china.news";
    rabbitTemplate.convertAndSend(exchangeName, "china.news", message);
}