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import org.apache.kafka.clients.producer.KafkaProducer;

import org.apache.kafka.clients.producer.ProducerRecord;

public class MessageProducer {

private final KafkaProducer producer;

public MessageProducer(String brokers) {

Properties props = new Properties();

props.put("bootstrap.servers", brokers);

props.put("acks", "all");

props.put("retries", 0);

props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");

props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");

this.producer = new KafkaProducer<>(props);

}

public void sendMessage(String topic, String message) {

ProducerRecord record = new ProducerRecord<>(topic, message);

producer.send(record);

}

}

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import org.apache.kafka.clients.consumer.ConsumerRecord;

import org.apache.kafka.clients.consumer.ConsumerRecords;

import org.apache.kafka.clients.consumer.KafkaConsumer;

import java.util.Arrays;

import java.util.Properties;

public class MessageConsumer {

private final KafkaConsumer consumer;

public MessageConsumer(String brokers, String groupId) {

Properties props = new Properties();

props.put("bootstrap.servers", brokers);

props.put("group.id", groupId);

props.put("enable.auto.commit", "true");

props.put("auto.commit.interval.ms", "1000");

props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");

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props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");

this.consumer = new KafkaConsumer<>(props);

}

public void consumeMessages(String topic) {

consumer.subscribe(Arrays.asList(topic));

while (true) {

ConsumerRecords records = consumer.poll(100);

for (ConsumerRecord record : records)

System.out.printf("offset = %d, key = %s, value = %s%n", record.offset(), record.key(), record.value());

}

}

}

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