1.2 Broker
1.3 Producer
1.4 Consumer
1.5 ZooKeeper
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.ProducerRecord;
import java.util.Properties;
public class KafkaProducerDemo {
public static void main(String[] args) {
Properties props = new Properties();
props.setProperty("bootstrap.servers", "localhost:9092");
props.setProperty("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.setProperty("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
Producer<String, String> producer = new KafkaProducer<>(props);
for (int i = 0; i < 10; i++) {
ProducerRecord<String, String> record = new ProducerRecord<>("my_topic", Integer.toString(i), Integer.toString(i));
producer.send(record);
}
producer.close();
}
}
import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import java.util.Properties;
public class KafkaConsumerDemo {
public static void main(String[] args) {
Properties props = new Properties();
props.setProperty("bootstrap.servers", "localhost:9092");
props.setProperty("group.id", "my_consumer_group");
props.setProperty("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.setProperty("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
Consumer<String, String> consumer = new KafkaConsumer<>(props);
consumer.subscribe(Collections.singletonList("my_topic"));
while (true) {
ConsumerRecords<String, String> records = consumer.poll(100);
for (ConsumerRecord<String, String> record : records) {
System.out.println("Received message: key = " + record.key() + ", value = " + record.value());
}
}
}
}
