方法运行后在Main中显式启动Kafka Consumer

import org.apache.kafka.clients.consumer.Consumer;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.common.serialization.StringDeserializer;

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

public class Main {
    public static void main(String[] args) {
        // Kafka集群地址
        String bootstrapServers = "kafka1:9092,kafka2:9092,kafka3:9092";
        // 消费者组ID
        String groupId = "my-consumer-group";
        // 订阅的主题
        String topic = "my-topic";

        // 创建Kafka Consumer的配置
        Properties props = new Properties();
        props.put("bootstrap.servers", bootstrapServers);
        props.put("group.id", groupId);
        props.put("key.deserializer", StringDeserializer.class.getName());
        props.put("value.deserializer", StringDeserializer.class.getName());

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

        // 订阅主题
        consumer.subscribe(Collections.singletonList(topic));

        // 启动消费循环
        while (true) {
            // 从Kafka集群拉取消息
            ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(100));

            // 处理消息
            for (ConsumerRecord<String, String> record : records) {
                System.out.println("Received message: " + record.value());
                // 其他业务逻辑处理
            }
        }
    }
}