API简单消费者

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());
            }
        }

    }
}