统一消息系统

public class KafkaProducer {

private final String topic;

private final KafkaProducer producer;

public KafkaProducer(String bootstrapServers, String topic) {

this.topic = topic;

Properties props = new Properties();

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

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 key, String value) {

producer.send(new ProducerRecord<>(topic, key, value));

}

}

public class KafkaConsumer {

private final String groupId;

private final KafkaConsumer consumer;

public KafkaConsumer(String bootstrapServers, String groupId) {

this.groupId = groupId;

Properties props = new Properties();

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

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");

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

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

}

public void consumeMessages(String topic) {

consumer.subscribe(Collections.singletonList(topic));

while (true) {

ConsumerRecords records = consumer.poll(Duration.ofMillis(100));

for (ConsumerRecord record : records)

processMessage(record.key(), record.value());

}

}

private void processMessage(String key, String value) {

System.out.println("Processing message: Key=" + key + ", Value=" + value);

}

}