import org.apache.kafka.clients.producer.*;
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
Producer<String, String> producer = new KafkaProducer<>(props);
String topic = "my-topic";
String key = "my-key";
String value = "Hello Kafka";
ProducerRecord<String, String> record = new ProducerRecord<>(topic, key, value);
producer.send(record, new Callback() {
public void onCompletion(RecordMetadata metadata, Exception e) {
if (e != null) {
e.printStackTrace();
} else {
System.out.println("Message sent successfully: " + metadata);
}
}
});
producer.close();
import org.apache.kafka.clients.consumer.*;
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.put("group.id", "my-group");
Consumer<String, String> consumer = new KafkaConsumer<>(props);
String topic = "my-topic";
consumer.subscribe(Collections.singletonList(topic));
while (true) {
ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(100));
for (ConsumerRecord<String, String> record : records) {
System.out.println("Received message: " + record.value());
}
}
consumer.close();
