Kafka（消费者）示例_kafka消费者代码

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
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 KafkaConsumerExample {
    private static final String TOPIC_NAME = "bltest3";
    private static final String BOOTSTRAP_SERVERS = "hadoop01:9092";
    private static final String GROUP_ID = "console-consumer-88604";
 
    public static void main(String[] args) {
        // 配置Kafka消费者属性
        Properties props = new Properties();
        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, BOOTSTRAP_SERVERS);
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
        props.put(ConsumerConfig.GROUP_ID_CONFIG, GROUP_ID);
 
        // 创建Kafka消费者实例
        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
 
        // 订阅Kafka主题
        consumer.subscribe(Collections.singletonList(TOPIC_NAME));
 
        try {
            // 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: " + record.value());
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭Kafka消费者
            consumer.close();
        }
    }
}