package com.liuyaofeng.kafka.service;
import java.util.HashMap;  
import java.util.List;  
import java.util.Map;  
import java.util.Properties;  
  
import kafka.consumer.ConsumerConfig;  
import kafka.consumer.ConsumerIterator;  
import kafka.consumer.KafkaStream;  
import kafka.javaapi.consumer.ConsumerConnector;  
import kafka.serializer.StringDecoder;  
import kafka.utils.VerifiableProperties; 

@SuppressWarnings("all")
public class KafkaConsumer {
	 private final ConsumerConnector consumer;  
	  
	    private KafkaConsumer() {  
	        Properties props = new Properties();  
	        // zookeeper 配置  
	        props.put("zookeeper.connect", "127.0.0.1:2181");  
	  
	        // group 代表一个消费组  
	        props.put("group.id", "liugroup");  
	  
	        // zk连接超时  
	        props.put("zookeeper.session.timeout.ms", "4000");  
	        props.put("zookeeper.sync.time.ms", "200");  
	        props.put("rebalance.max.retries", "5");  
	        props.put("rebalance.backoff.ms", "1200");  
	          
	      
	        props.put("auto.commit.interval.ms", "1000");  
	        props.put("auto.offset.reset", "smallest");  
	        // 序列化类  
	        props.put("serializer.class", "kafka.serializer.StringEncoder");  
	  
	        ConsumerConfig config = new ConsumerConfig(props);  
	  
	        consumer = kafka.consumer.Consumer.createJavaConsumerConnector(config);  
	    }  
	  
	    void consume() {  
	        Map<String, Integer> topicCountMap = new HashMap<String, Integer>();  
	        topicCountMap.put(KafkaProducer.TOPIC, new Integer(1));  
	  
	        StringDecoder keyDecoder = new StringDecoder(new VerifiableProperties());  
	        StringDecoder valueDecoder = new StringDecoder(new VerifiableProperties());  
	  
	        Map<String, List<KafkaStream<String, String>>> consumerMap = consumer.createMessageStreams(topicCountMap, keyDecoder, valueDecoder);  
	        KafkaStream<String, String> stream = consumerMap.get(KafkaProducer.TOPIC).get(0);  
	        ConsumerIterator<String, String> it = stream.iterator();  
	        while (it.hasNext())  
	            System.out.println("******" + it.next().message() + "******");  
	    }  
	  
	    public static void main(String[] args) {  
	        new KafkaConsumer().consume();  
	    }  
}