Spring Cloud Stream监听已存在的Queues/Exchanges

• 环境准备

  • rabbitmq已运行，端口5672，控制台web端口15672，用户名密码guest/guest

• 引入spring cloud stream依赖

  compile('org.springframework.cloud:spring-cloud-starter-stream-rabbit')
  

• 创建StreamClient接口

  public interface StreamClient {
  
      String INPUT = "input";
  
      String OUTPUT = "output";
  
      @Input(StreamClient.INPUT)
      SubscribableChannel input();
  
      @Output(StreamClient.OUTPUT)
      MessageChannel output();
  }
  

• 创建监听StreamReceiver类

  @Slf4j
  @Component
  @EnableBinding(StreamClient.class)
  public class StreamReceiver {
  
      // 直接监听队列
  //    @RabbitListener(queues = "error_log")
  //    public void listenerObject(byte[] message) throws UnsupportedEncodingException {
  //        String errorLog = new String(message, "utf-8");
  //        log.info("Stream Receiver Object: {}", errorLog);
  //
  //    }
  
      @StreamListener(StreamClient.INPUT)
      public void processInput(Object message) {
          String errorLog = new String((byte[]) message, StandardCharsets.UTF_8);
          log.info("StreamInput Receiver Object: {}", errorLog);
      }
  
  }
  

• 配置application.yaml

  spring:
    rabbitmq:
      host: x.x.x.x
      port: 5672
      username: guest
      password: guest
    cloud:
      stream:
        bindings:
          input:
            destination: LogExchanger #Exchange名称
            group: error_log #队列名称
        #        output:
        #          destination: LogExchanger
        #          group: error_log
        rabbit:
          bindings:
            input:
              consumer:
                bindQueue: false
                declareExchange: false
                queueNameGroupOnly: true
  

  参考：https://cloud.spring.io/spring-cloud-static/spring-cloud-stream-binder-rabbit/2.2.0.RELEASE/spring-cloud-stream-binder-rabbit.html#_using_existing_queuesexchanges