tencent cloud

Generating Data

By Java code

@Component
@Slf4j
public class KafkaProducer {
    @Autowired
   private KafkaTemplate<String, Object> kafkaTemplate;
    // Custom topics.
   public static final String TOPIC_TEST = "topic.test";
    //
   public static final String TOPIC_GROUP1 = "topic.group1";
    //
   public static final String TOPIC_GROUP2 = "topic.group2";
    public void send(Object obj) {
       String obj2String = JSONObject.toJSONString(obj);
       log.info("the message to send: {}", obj2String);
       // Send a message.
       ListenableFuture<SendResult<String, Object>> future = kafkaTemplate.send(TOPIC_TEST, obj);
       future.addCallback(new ListenableFutureCallback<SendResult<String, Object>>() {
           @Override
           public void onFailure(Throwable throwable) {
               // Returned result for failed sending
               log.info(TOPIC_TEST + " - the producer failed to send the message:" + throwable.getMessage());
           }
            @Override
           public void onSuccess(SendResult<String, Object> stringObjectSendResult) {
               // Returned result for successful sending
               log.info(TOPIC_TEST + " - the producer sent the message successfully:" + stringObjectSendResult.toString());
           }
       });
   }
}

By command

bin/kafka-console-producer.sh --broker-list node86:9092 --topic t_cdr

Consuming Data

By Java code

@Component
@Slf4j
public class KafkaConsumer {
    @KafkaListener(topics = KafkaProducer.TOPIC_TEST, groupId = KafkaProducer.TOPIC_GROUP1)
   public void topic_test(ConsumerRecord<?, ?> record, Acknowledgment ack, @Header(KafkaHeaders.RECEIVED_TOPIC) String topic) {
        Optional message = Optional.ofNullable(record.value());
       if (message.isPresent()) {
           Object msg = message.get();
           log.info("topic_test consumed: Topic:" + topic + ",Message:" + msg);
           ack.acknowledge();
       }
   }
    @KafkaListener(topics = KafkaProducer.TOPIC_TEST, groupId = KafkaProducer.TOPIC_GROUP2)
   public void topic_test1(ConsumerRecord<?, ?> record, Acknowledgment ack, @Header(KafkaHeaders.RECEIVED_TOPIC) String topic) {
        Optional message = Optional.ofNullable(record.value());
       if (message.isPresent()) {
           Object msg = message.get();
           log.info("topic_test1 consumed: Topic:" + topic + ",Message:" + msg);
           ack.acknowledge();
       }
   }
}

By command

bin/kafka-console-consumer.sh --zookeeper node01:2181 --topic t_cdr --from-beginning

Adding a topic (by command)

bin/kafka-topics.sh --zookeeper node01:2181 --create --topic t_cdr --partitions 30  --replication-factor 2

For more information, see Kafka Documentation.