如何使用kafka客户端使用java语言进行主题消费

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", "kafka-server1:9092,kafka-server2:9092");
        props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
        props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");

        // 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 message = "Hello, Kafka!";
        producer.send(new ProducerRecord<>(topic, message));

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

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

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", "kafka-server1:9092,kafka-server2:9092");
        props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");

        // 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));

        // 消费消息
        while (true) {
            ConsumerRecords<String, String> records = consumer.poll(100);
            for (ConsumerRecord<String, String> record : records) {
                System.out.println("Received message: " + record.value());
            }
        }
    }
}