kafka0.9版本以後用java重新編寫了producer，廢除了原來scala編寫的版本。
這裏直接使用最新2.3版本，0.9以後的版本都適用。
注意引用的包爲：org.apache.kafka.clients.producer
import java.util.Properties;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.ProducerRecord;
public class ProducerDemo {
public static void main(String[] args) {
Properties properties = new Properties();
properties.put("bootstrap.servers", "kafka01:9092,kafka02:9092");
properties.put("acks", "all");
properties.put("retries", 0);
properties.put("batch.size", 16384);
properties.put("linger.ms", 1);
properties.put("buffer.memory", 33554432);
properties.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
properties.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
KafkaProducer<String, String> kafkaProducer = new KafkaProducer<String, String>(properties);
kafkaProducer.send(new ProducerRecord<>("topic", "value"));
kafkaProducer.close();
}
}
0.11.0以後增加了事務，事務producer的示例代碼如下，需要適用於0.11.0以後的版本：
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.common.KafkaException;
import org.apache.kafka.common.errors.AuthorizationException;
import org.apache.kafka.common.errors.OutOfOrderSequenceException;
import org.apache.kafka.common.errors.ProducerFencedException;
import org.apache.kafka.common.serialization.StringSerializer;
import java.util.Properties;
public class TransactionsProducerDemo {
public static void main(String[] args) {
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("transactional.id", "my-transactional-id");
Producer<String, String> producer = new KafkaProducer<>(props, new StringSerializer(), new StringSerializer());
producer.initTransactions();
try {
producer.beginTransaction();
for (int i = 0; i < 100; i++)
producer.send(new ProducerRecord<>("my-topic", Integer.toString(i), Integer.toString(i)));
producer.commitTransaction();
} catch (ProducerFencedException | OutOfOrderSequenceException | AuthorizationException e) {
// We can't recover from these exceptions, so our only option is to close the producer and exit.
producer.close();
} catch (KafkaException e) {
// For all other exceptions, just abort the transaction and try again.
producer.abortTransaction();
}
producer.close();
}
}更多實時計算，Kafka等相關技術博文，歡迎關注實時流式計算
