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 java.util.Collections;
import java.util.Properties;
public class MyConsumer {
public static void main(String[] args) {
//1.创建消费者配置信息
Properties properties = new Properties();
//2.给配置信息赋值
//连接的集群
properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.235.3:9092");
//开启自动提交
properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, true);
//自动提交的延时
properties.put(ConsumerConfig.AUTO_COMMIT_INTERVAL_MS_CONFIG, "1000");
//key和value的反序列化
properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
//消费者组
properties.put(ConsumerConfig.GROUP_ID_CONFIG, "youngyoungyoung");
//创建消费者
KafkaConsumer<String, String> consumer = new KafkaConsumer<>(properties);
//订阅主题
consumer.subscribe(Collections.singletonList("first"));
while (true) {
ConsumerRecords<String, String> consumerRecords = consumer.poll(100);
//解析并遍历ConsumerRecords
for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
System.out.println(consumerRecord.key() + "---" + consumerRecord.value());
}
}
}
}
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