java kafka 多线程消费

我们先来看下简单的kafka生产者和消费者模式代码：

生产者KafkaProducer

/**
 * @author xiaofeng
 * @version V1.0
 * @title: KafkaProducer.java
 * @package: com.yingda.xsignal.app.test
 * @description: kafka生产者demo
 * @date 2018/4/4 0004 上午 11:20
 */
public class KafkaProducer extends Thread {

    private String topic;

    public KafkaProducer(String topic) {
        super();
        this.topic = topic;
    }

    @Override
    public void run() {
        Producer producer = createProducer();
        int i = 0;
        while (true) {
            String msg = "message";
            producer.send(new KeyedMessage<Integer, String>(topic, msg + (i++)));
            try {
                TimeUnit.SECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    private Producer createProducer() {
        Properties properties = new Properties();
        //声明zk
        properties.put("zookeeper.connect", "10.0.2.22:2181");
        properties.put("serializer.class", StringEncoder.class.getName());
        properties.put("metadata.broker.list", "10.0.2.22:9092");
        properties.put("batch.size", 4096);
        return new Producer<Integer, String>(new ProducerConfig(properties));
    }


    public static void main(String[] args) {
        new KafkaProducer("TEST_TOPIC").start();
    }

}  

消费者KafkaConsumer

/**
 * @author xiaofeng
 * @version V1.0
 * @title: KafkaConsumer.java
 * @package: com.yingda.xsignal.app.test
 * @description: 单线程消费模式
 * @date 2018/4/4 0004 上午 11:18
 */
public class KafkaConsumer extends Thread {

    private String topic;

    public KafkaConsumer