Kafka消费者demo

package test;

/**
 * Created by fangchangchun on 2020-04-22.
 */
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
//import org.apache.log4j.Logger;

import java.util.Arrays;
import java.util.Properties;

public class SimpleKafkaConsumer {
    private static KafkaConsumer<String, String> consumer;
    private final static String TOPIC = "test";

    public SimpleKafkaConsumer() {
        Properties props = new Properties();
        props.put("bootstrap.servers", "localhost:9092");
        //每个消费者分配独立的组号
        props.put("group.id", "test2");
        //如果value合法，则自动提交偏移量
        props.put("enable.auto.commit", "true");
        //设置多久一次更新被消费消息的偏移量
        props.put("auto.commit.interval.ms", "1000");
        //设置会话响应的时间，超过这个时间kafka可以选择放弃消费或者消费下一条消息
        props.put("session.timeout.ms", "30000");
        //自动重置offset
        props.put("auto.offset.reset", "earliest");
        props.put("key.deserializer",
                "org.apache.kafka.common.serialization.StringDeserializer");
        props.put("value.deserializer",
                "org.apache.kafka.common.serialization.StringDeserializer");
        consumer = new KafkaConsumer<String, String>(props);
    }

    public void consume() {
        consumer.subscribe(Arrays.asList(TOPIC));
        while (true) {
            ConsumerRecords<String, String> records = consumer.poll(100);
            for (ConsumerRecord<String, String> record : records) {
                System.out.printf("offset = %d, key = %s, value = %s", record.offset(), record.key(), record.value());
                System.out.println();
            }
        }
    }

    public static void main(String[] args) {
        new SimpleKafkaConsumer().consume();
    }
}