RabbitMQ 使用之 四种交换机模式

1、集成RabbitMQ

• . 添加依赖

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-amqp</artifactId>
</dependency>

• . 添加配置

#RabbitMQ
spring.rabbitmq.host=39.106.128.50
spring.rabbitmq.port=5672
spring.rabbitmq.username=guest
spring.rabbitmq.password=guest
spring.rabbitmq.virtual-host=/
#消费者数量
spring.rabbitmq.listener.simple.concurrency=10
spring.rabbitmq.listener.simple.max-concurrency=10
#消费者每次从队列中获取的消息数量
spring.rabbitmq.listener.simple.prefetch=1
#消费者自动启动
spring.rabbitmq.listener.simple.auto-startup=true
#消费失败，自动从新入队
spring.rabbitmq.listener.simple.default-requeue-rejected=true
#启用发送重试
spring.rabbitmq.template.retry.enabled=true
spring.rabbitmq.template.retry.initial-interval=1000
spring.rabbitmq.template.retry.max-attempts=3
spring.rabbitmq.template.retry.max-interval=10000
spring.rabbitmq.template.retry.multiplier=1.0

注意使用guest用户远程访问RabbitMQ，若是访问失败，须要在远程的RabbitMQ中进行以下配置：
在 /usr/local/rabbitmq/rabbitmq_server-3.7.4/etc/rabbitmq/ 目录下，新建rabbitmq.config文件，里面写入：“[{rabbit, [{loopback_users, []}]}]. ”便可，不用加双引号。

2、RabbitMQ的使用

• RabbitMQ 有四种交换机模式：

  • Direct Pattern （此模式不须要配置交换机）
  • Fanout Pattern ( 相似于广播同样，将消息发送给和他绑定的队列 )
  • Topic Pattern ( 绑定交换机时能够作匹配。 #：表示零个或多个单词。*：表示一个单词 )
  • Header Pattern ( 带有参数的匹配规则 )

• 详细举例以下：

/** * 发送方 */
@Service
public class MQSender {

    private static final Logger log = LoggerFactory.getLogger(MQSender.class);

    @Autowired
    AmqpTemplate amqpTemplate;

    /** * use Direct Pattern. RabbitMQ default, no need exchange. * @param message */
    public void sendDirect(Object message){
        String msg = RedisService.BeanToString(message);
        log.info("send direct message:" + msg );
        amqpTemplate.convertAndSend(MQConfig.DIRECT_QUEUE,msg);
    }

    /** * use Direct Pattern * @param message */
    public void sendFanout(Object message){
        String msg = RedisService.BeanToString(message);
        log.info("send fanout message:" + msg );
        amqpTemplate.convertAndSend(MQConfig.FANOUT_EXCHANGE,"",msg);
    }

    /** * use Topic Pattern * @param message */
    public void sendTopic(Object message){
        String msg = RedisService.BeanToString(message);
        log.info("send Topic message:" + msg );
        amqpTemplate.convertAndSend(MQConfig.TOPIC_EXCHANGE,"topic.key1",msg+"1");  // 能够匹配到 topic.# and topic.key1
        amqpTemplate.convertAndSend(MQConfig.TOPIC_EXCHANGE,"topic.key2",msg+"2");  // 能够匹配到 topic.#
    }

    /** * use Header Pattern * @param message */
    public void sendHeader(Object message){
        String msg = RedisService.BeanToString(message);
        log.info("send Header message:" + msg );

        MessageProperties mp = new MessageProperties();
        mp.setHeader("header1","value1");
        mp.setHeader("header2","value2");   // 与 配置中的map彻底匹配，由于那边是 whereAll()方法
        Message message1 = new Message(msg.getBytes(),mp);
        amqpTemplate.convertAndSend(MQConfig.HEADER_EXCHANGE,"",message1);  // 能够匹配到 topic.# and topic.key1
    }

/** * 配置中心 */ 
 @Configuration
public class MQConfig {

    public static final String DIRECT_QUEUE = "direct.queue";

    public static final String FANOUT_QUEUE1 = "fanout.queue1";
    public static final String FANOUT_QUEUE2 = "fanout.queue2";
    public static final String FANOUT_EXCHANGE = "fanout.exchange";

    public static final String TOPIC_QUEUE1 = "topic.queue1";
    public static final String TOPIC_QUEUE2 = "topic.queue2";
    public static final String TOPIC_EXCHANGE = "topic.exchange";
    public static final String TOPIC_KEY1 = "topic.key1";
    public static final String TOPIC_KEY2 = "topic.#";

    public static final String HEADER_QUEUE = "header.queue";
    public static final String HEADER_EXCHANGE = "header.exchange";

    /** * Direct 模式 交换机Exchange */
    @Bean
    public Queue directQueue(){
        // 一个参数是名称，，另外一个表示是否持久化
        return new Queue(DIRECT_QUEUE,true);
    }

    /**---------------------------------------------*/

    /** * Fanout Pattern. 相似于广播同样，将消息发送给和他绑定的队列 **/
    @Bean
    public Queue fanoutQueue1(){
        return new Queue(FANOUT_QUEUE1,true);
    }
    @Bean
    public Queue fanoutQueue2(){
        return new Queue(FANOUT_QUEUE2,true);
    }
    @Bean
    public FanoutExchange fanoutExchange(){
        return new FanoutExchange(FANOUT_EXCHANGE);
    }
    /** * 绑定 exchange and queue */
    @Bean
    public Binding fanoutBinding1(){
        return BindingBuilder.bind(fanoutQueue1()).to(fanoutExchange());
    }
    @Bean
    public Binding fanoutBinding2(){
        return BindingBuilder.bind(fanoutQueue2()).to(fanoutExchange());
    }

    /**---------------------------------------------*/

    /** * Topic Pattern. 绑定交换机时能够作匹配。 #：表示零个或多个单词。*：表示一个单词 **/
    @Bean
    public Queue topicQueue1(){
        return new Queue(TOPIC_QUEUE1,true);
    }
    @Bean
    public Queue topicQueue2(){
        return new Queue(TOPIC_QUEUE2,true);
    }
    @Bean
    public TopicExchange topicExchange(){
        return new TopicExchange(TOPIC_EXCHANGE);
    }
    /** * 绑定 exchange and queue */
    @Bean
    public Binding topicBinding1(){
        return BindingBuilder.bind(topicQueue1()).to(topicExchange()).with(TOPIC_KEY1);  // 精确匹配, 匹配成功则发送到 TOPIC_QUEUE1队列
    }
    @Bean
    public Binding topicBinding2(){
        return BindingBuilder.bind(topicQueue2()).to(topicExchange()).with(TOPIC_KEY2);  // 模糊匹配，匹配成功则发送到 TOPIC_QUEUE2队列
    }

    /**---------------------------------------------*/

    /** * Header Pattern. 交换机 Exchange **/
    @Bean
    public Queue headerQueue(){
        return new Queue(HEADER_QUEUE,true);
    }
    @Bean
    public HeadersExchange headersExchange(){
        return new HeadersExchange(HEADER_EXCHANGE);
    }
    @Bean
    public Binding headerBinding(){
        Map<String,Object> map = new HashMap<>();
        map.put("header1","value1");
        map.put("header2","value2");
        return BindingBuilder.bind(headerQueue()).to(headersExchange()).whereAll(map).match();   // whereXxx() 方法表明了匹配规则

    }
}

/** * 消费者 */
@Service
public class MQReceiver {

    private static final Logger log = LoggerFactory.getLogger(MQReceiver.class);

    /** * Direct Pattern. * @param message */
    @RabbitListener(queues = MQConfig.DIRECT_QUEUE)
    public void directReceive(String message){
        log.info("receive direct message:" + message);
    }

    /** ----------------------------- */

    /** * fanout Pattern. * @param message */
    @RabbitListener(queues = MQConfig.FANOUT_QUEUE1)
    public void fanoutReceive1(String message){
        log.info("receive fanout1 message:" + message);
    }
    /** * fanout Pattern. * @param message */
    @RabbitListener(queues = MQConfig.FANOUT_QUEUE2)
    public void fanoutReceive2(String message){
        log.info("receive fanout2 message:" + message);
    }

    /** ----------------------------- */

    /** * topic Pattern. * @param message */
    @RabbitListener(queues = MQConfig.TOPIC_QUEUE1)
    public void topicReceive1(String message){
        log.info("receive topic1 message:" + message);
    }
    /** * topic Pattern. * @param message */
    @RabbitListener(queues = MQConfig.TOPIC_QUEUE2)
    public void topicReceive2(String message){
        log.info("receive topic2 message:" + message);
    }

    /** ----------------------------- */

    /** * Header Pattern. * @param message */
    @RabbitListener(queues = MQConfig.HEADER_QUEUE)
    public void topicHeader(byte[] message){
        log.info("receive topic1 message:" + new String(message));
    }

}