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);
ProducerRecord<String, String> record = new ProducerRecord<>("my_topic", "my_key", "my_value");
producer.send(record, (metadata, exception) -> {
if (exception != null) {
exception.printStackTrace();
} else {
System.out.println("Message sent successfully, offset: " + metadata.offset());
}
});
producer.close();
Properties props = new Properties();
props.put("bootstrap.servers", "localhost:9092");
props.put("group.id", "my_consumer_group");
props.put("enable.auto.commit", "true");
props.put("auto.commit.interval.ms", "1000");
props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
consumer.subscribe(Collections.singletonList("my_topic"));
while (true) {
ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(100));
for (ConsumerRecord<String, String> record : records) {
System.out.println("Received message: key = " + record.key() + ", value = " + record.value() +
", partition = " + record.partition() + ", offset = " + record.offset());
}
}
