多線程示例代碼：

這里要根據自身需求開發，我這里只舉一個簡單的例子，就是幾個分區就啟動幾個consumer，一一對應。
三個類：
Main：
public static void main(String[] args) {

		String bootstrapServers = "kafka01:9092，kafka02:9092";
		String groupId = "test";
		String topic = "testtopic";
		int consumerNum = 3;
		ConsumerGroup cg = new ConsumerGroup(consumerNum,bootstrapServers,groupId,topic);
		cg.execute();
}



import java.util.ArrayList;
import java.util.List;


public class ConsumerGroup {

	private List<ConsumerRunnable> consumers;

	public ConsumerGroup(int consumerNum,String bootstrapServers,String groupId,String topic){

		consumers = new ArrayList<>(consumerNum);

		for(int i=0;i < consumerNum;i++){
			ConsumerRunnable ConsumerRunnable = new ConsumerRunnable(bootstrapServers,groupId,topic);
			consumers.add(ConsumerRunnable);
		}
	}

	public void execute(){

		for(ConsumerRunnable consumerRunnable:consumers){
			new Thread(consumerRunnable).start();
		}
	}
}



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

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

public class ConsumerRunnable implements Runnable{

	private final KafkaConsumer<String,String> consumer;

	public ConsumerRunnable(String bootstrapServers,String groupId,String topic){

		Properties props = new Properties();
props.put("bootstrap.servers", bootstrapServers);
props.put("group.id", groupId);
props.put("enable.auto.commit", "true");
props.put("auto.commit.interval.ms", "1000");
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");
this.consumer = new KafkaConsumer<>(props);
consumer.subscribe(Arrays.asList(topic));
	}

	@Override
	public void run() {
while (true) {
ConsumerRecords<String, String> records = consumer.poll(10);
for (ConsumerRecord<String, String> record : records) {
	System.out.printf("offset = %d, key = %s, value = %s%n", record.offset(), record.key(), record.value());
}
}
	}
}