Consumer

package com.kiddcorp;
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 org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

/**
 * Example of a simple consumer
 */
public class ConsumerDemo {

    public static void main(String[] args) {

        Logger logger = LoggerFactory.getLogger(ConsumerDemo.class);

        String bootstrapServers = "localhost:9092,localhost:9091";
        String topic = "testTopic";
        String groupId = "G1";

        Properties properties = new Properties();
        properties.setProperty(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
        properties.setProperty(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
        properties.setProperty(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
        properties.setProperty(ConsumerConfig.GROUP_ID_CONFIG, groupId);
 
        //create consumer
        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(properties);

        //subscribe to our topic(s)
        consumer.subscribe(Collections.singletonList(topic));

        //poll for new data
        while (true) {
            ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(100));
            for (ConsumerRecord<String, String> record : records) {
                System.out.printf("\nKey: %s\nValue: %s\nPartition: %s\nOffset: %s\n",
                        record.key(), record.value(), record.partition(), record.offset());
            }
        }


    }
}