spring cloud stream-Kafka Streams的简单使用

spring cloud stream-Kafka Streams的简单使用

<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-stream-binder-kafka-streams</artifactId>
</dependency>

spring cloud stream-Apache Kafka的简单使用

<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-stream-binder-kafka</artifactId>
</dependency>

<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-starter-stream-kafka</artifactId>
</dependency>

定义发射器/接收器

public interface Consumer {
	String FILE_UPLOAD = "fileUpload";
	String FINISHED_UPLOAD = "finishedUpload";
	// 接收消息的通道,对应配置
	@Input(FINISHED_UPLOAD)
	SubscribableChannel finishedUpload();
	// 发消息的通道
	@Output(FILE_UPLOAD)
	MessageChannel fileUpload();
}
public interface Producer {
	String FILE_UPLOAD = "fileUpload";
	String FINISHED_UPLOAD = "finishedUpload";
	// 接收消息的通道
	@Input(FILE_UPLOAD)
	SubscribableChannel fileUpload();
	// 发消息的通道
	@Output(FINISHED_UPLOAD)
	MessageChannel finishedUpload();
}

消息发送/消息处理

public class FileUploadController {
	@Autowired
	private Consumer consumer;
	@SysLog("文件上传" )
	@PostMapping
	public R save() {
		log.info("文件上传成功");
		log.info("通过kafka发送消息");
		// 有返回值，如果要关注发送结果，则判断返回值
		// 一般消息体不会这么简单
		consumer.fileUpload().send(MessageBuilder.withPayload("upgrade").build());
		return R.ok();
	}
}
@Transactional
@Component
@Slf4j
public class UploadListenner {
	@Autowired
	@Qualifier(Producer.FINISHED_UPLOAD)
	private MessageChannel finishedUploadMessageChannel;
	@StreamListener(Producer.FILE_UPLOAD)
	@SendTo(Producer.FINISHED_UPLOAD)
	public String processFileUpload(String message) {
		log.info("Consumer"+ message);
		log.info("Consumer upgrading .....");
		return message;
	}
}

监听结果

@Component
@Slf4j
public class UploadListenner {
	@StreamListener(Consumer.FINISHED_UPLOAD)
	public void listenFileUpload(String message) {
		log.info("Producer:",message);
	}
}

配置

生产者

stream:
      kafka:
        binder:
          brokers: 192.168.204.131
      bindings:
        finishedUpload:
          group: @artifactId@

消费者

 stream:
      kafka:
        binder:
         brokers: 192.168.204.131
      bindings:
        fileUpload:
            group: @artifactId@

主程序

@EnableBinding(Consumer.class)
public class MessageProducerApplication {
		public static void main(String[] args) {
			SpringApplication.run(ProducerApplication.class, args);
		}
}

@EnableBinding(Producer.class)
public class MessageConsumerApplication {
		public static void main(String[] args) {
			SpringApplication.run(MessageConsumerApplication.class, args);
		}
}