import org.apache.kafka.clients.producer.*;
public class KafkaProducerExample {
public static void main(String[] args) {
Properties properties = new Properties();
properties.put("bootstrap.servers", "localhost:9092");
properties.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
properties.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
Producer<String, String> producer = new KafkaProducer<>(properties);
String topic = "test-topic";
String key = "key1";
String value = "Hello, Kafka!";
ProducerRecord<String, String> record = new ProducerRecord<>(topic, key, value);
try {
RecordMetadata metadata = producer.send(record).get();
System.out.println("Message sent to partition " + metadata.partition() + ", offset " + metadata.offset());
} catch (Exception e) {
e.printStackTrace();
} finally {
producer.close();
}
}
}
import org.apache.kafka.clients.consumer.*;
import java.util.Collections;
import java.util.Properties;
public class KafkaConsumerExample {
public static void main(String[] args) {
Properties properties = new Properties();
properties.put("bootstrap.servers", "localhost:9092");
properties.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
properties.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
properties.put("group.id", "test-group");
Consumer<String, String> consumer = new KafkaConsumer<>(properties);
String topic = "test-topic";
consumer.subscribe(Collections.singletonList(topic));
try {
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() + ", partition=" + record.partition() + ", offset=" + record.offset());
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
consumer.close();
}
}
}
