Kafka0.8.2 consumer examples

Time:2021-10-26

maven

<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka_2.10</artifactId>
    <version>0.8.2.2</version>
</dependency>

Advanced API instance

public class NativeConsumer {

    private static final String TOPIC = "kafkatopic";

    public void exec() throws UnsupportedEncodingException {
        Properties props = new Properties();
        props.put("zookeeper.connect", "localhost:2181");
        props.put("auto.offset.reset","smallest");
        props.put("group.id", "test-group");
        props.put("enable.auto.commit", "true");
        props.put("zookeeper.session.timeout.ms", "400");
        props.put("zookeeper.sync.time.ms", "200"); 
        props.put("auto.commit.interval.ms", "1000");
        ConsumerConfig consumerConfig =  new kafka.consumer.ConsumerConfig(props);
        ConsumerConnector consumerConnector = kafka.consumer.Consumer.createJavaConsumerConnector(consumerConfig);

        Map<String, Integer> topicCountMap = new HashMap<String, Integer>();
        int localConsumerCount = 1;
        topicCountMap.put(TOPIC, localConsumerCount);
        Map<String, List<KafkaStream<byte[], byte[]>>> consumerMap = consumerConnector
                .createMessageStreams(topicCountMap);
        List<KafkaStream<byte[], byte[]>> streams = consumerMap.get(TOPIC);
        streams.stream().forEach(stream -> {
            ConsumerIterator<byte[], byte[]> it = stream.iterator();
            while (it.hasNext()) {
                System.out.println(new String(it.next().message()));
            }
        });
    }
}

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