SampleConsumer.java

import org.apache.kafka.clients.CommonClientConfigs;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;

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

public class SampleConsumer {
    public static void main(String[] args) throws Exception {
        String topic = "sample-topic";
        Properties props = new Properties();
        props.put("bootstrap.servers", "kafka-a.company.com:9092,kafka-b.company.com:9092,kafka-c.company.com:9092");
        props.put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG, "SASL_SSL");
        props.put("sasl.mechanism", "PLAIN");
        props.put("group.id", "sample-group");
        props.put("enable.auto.commit", "true");
        props.put("auto.commit.interval.ms", "1000");
        props.put("session.timeout.ms", "30000");
        props.put("key.deserializer",
                "org.apache.kafka.common.serialization.StringDeserializer");
        props.put("value.deserializer",
                "org.apache.kafka.common.serialization.StringDeserializer");
        props.put("auto.offset.reset", "earliest");
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(props);
        consumer.subscribe(Arrays.asList(topic));
        boolean flag = true;
        while (true) {
            try {
                ConsumerRecords<String, String> records = consumer.poll(100);
                if (flag) {
                    consumer.seekToBeginning(consumer.assignment());
                    flag = false;
                }
                for (ConsumerRecord<String, String> record : records) {
                    System.out.printf("offset = %d, key = %s, value = %s\n",
                            record.offset(), record.key(), record.value());
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}