kafka读写操作代码

Kafka是一个分布式流处理平台，它提供了高吞吐量、可持久化的消息传递系统。下面是Kafka读写操作的代码示例：

1. 生产者（Producer）代码示例：

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

import java.util.Properties;

public class KafkaProducerExample {
    public static void main(String[] args) {
        // 配置Kafka生产者的属性
        Properties props = new Properties();
        props.put("bootstrap.servers", "localhost:9092"); // Kafka集群地址
        props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer"); // 键的序列化器
        props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer"); // 值的序列化器

        // 创建Kafka生产者实例
        Producer<String, String> producer = new KafkaProducer<>(props);

        // 发送消息到指定主题
        String topic = "my-topic";
        String key = "key1";
        String value = "Hello, Kafka!";
        ProducerRecord<String, String> record = new ProducerRecord<>(topic, key, value);
        producer.send(record, new Callback() {
            @Override
            public void onCompletion(RecordMetadata metadata, Exception exception) {
                if (exception != null) {
                    System.err.println("Error sending message: " + exception.getMessage());
                } else {
                    System.out.println("Message sent successfully! Topic: " + metadata.topic() +
                            ", Partition: " + metadata.partition() +
                            ", Offset: " + metadata.offset());
                }
            }
        });

        // 关闭Kafka生产者
        producer.close();
    }
}

2. 消费者（Consumer）代码示例：

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

import java.time.Duration;
import java.util.Collections;
import java.util.Properties;

public class KafkaConsumerExample {
    public static void main(String[] args) {
        // 配置Kafka消费者的属性
        Properties props = new Properties();
        props.put("bootstrap.servers", "localhost:9092"); // Kafka集群地址
        props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer"); // 键的反序列化器
        props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer"); // 值的反序列化器
        props.put("group.id", "my-group"); // 消费者组ID

        // 创建Kafka消费者实例
        Consumer<String, String> consumer = new KafkaConsumer<>(props);

        // 订阅主题
        String topic = "my-topic";
        consumer.subscribe(Collections.singletonList(topic));

        // 持续消费消息
        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() +
                        ", Topic = " + record.topic() +
                        ", Partition = " + record.partition() +
                        ", Offset = " + record.offset());
            }
        }

        // 关闭Kafka消费者
        consumer.close();
    }
}

以上是Java语言的示例代码，你可以根据自己的需求进行修改和扩展。如果你使用其他编程语言，可以参考对应语言的Kafka客户端库文档进行开发。