使用KafkaProducer恰好发送一个ProducerRecord

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

public class KafkaProducerExample {
    public static void main(String[] args) {
        // 配置Kafka集群的连接信息
        Properties props = new Properties();
        props.put("bootstrap.servers", "kafka1:9092,kafka2:9092,kafka3:9092");
        props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
        props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");

        // 创建KafkaProducer实例
        KafkaProducer<String, String> producer = new KafkaProducer<>(props);

        // 创建ProducerRecord对象
        String topic = "my_topic";
        String key = "my_key";
        String value = "Hello, Kafka!";
        ProducerRecord<String, String> record = new ProducerRecord<>(topic, key, value);

        // 发送消息
        producer.send(record, new Callback() {
            @Override
            public void onCompletion(RecordMetadata metadata, Exception exception) {
                if (exception != null) {
                    System.err.println("Failed to send message: " + exception.getMessage());
                } else {
                    System.out.println("Message sent successfully! Offset: " + metadata.offset());
                }
            }
        });

        // 关闭KafkaProducer
        producer.close();
    }
}