Kafka简单客户端编程实例

package com.lya.kafka; 
 
/** 
 * 配置项 
 * @author liuyazhuang 
 * 
 */ 
public class Config { 
  
 /** 
  * 话题 
  */ 
 public static final String TOPIC = "wordcount"; 
 /** 
  * 线程数 
  */ 
 public static final Integer THREADS = 1; 
} 

package com.lya.kafka; 
 
import java.util.Properties; 
 
import kafka.javaapi.producer.Producer; 
import kafka.producer.KeyedMessage; 
import kafka.producer.ProducerConfig; 
 
/** 
 * 生产者实例 
 * @author liuyazhuang 
 * 
 */ 
public class ProducerDemo { 
 public static void main(String[] args) throws Exception { 
  Properties props = new Properties(); 
  props.put("zk.connect", "192.168.209.121:2181"); 
  props.put("metadata.broker.list","192.168.209.121:9092"); 
  props.put("serializer.class", "kafka.serializer.StringEncoder"); 
  props.put("zk.connectiontimeout.ms", "15000"); 
  ProducerConfig config = new ProducerConfig(props); 
  Producer<String, String> producer = new Producer<String, String>(config); 
 
  // 发送业务消息 
  // 读取文件 读取内存数据库 读socket端口 
  for (int i = 1; i <= 100; i++) { 
   Thread.sleep(500); 
   producer.send(new KeyedMessage<String, String>(Config.TOPIC, 
     "this number ===>>> " + i)); 
  } 
 
 } 
} 

package com.lya.kafka; 
 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
import java.util.Properties; 
 
import kafka.consumer.Consumer; 
import kafka.consumer.ConsumerConfig; 
import kafka.consumer.KafkaStream; 
import kafka.javaapi.consumer.ConsumerConnector; 
import kafka.message.MessageAndMetadata; 
 
/** 
 * 消费者实例 
 * @author liuyazhuang 
 * 
 */ 
public class ConsumerDemo { 
  
 
 public static void main(String[] args) { 
   
  Properties props = new Properties(); 
  props.put("zookeeper.connect", "192.168.209.121:2181"); 
  props.put("group.id", "1111"); 
  props.put("auto.offset.reset", "smallest"); 
  props.put("zk.connectiontimeout.ms", "15000"); 
 
  ConsumerConfig config = new ConsumerConfig(props); 
  ConsumerConnector consumer =Consumer.createJavaConsumerConnector(config); 
  Map<String, Integer> topicCountMap = new HashMap<String, Integer>(); 
  topicCountMap.put(Config.TOPIC, Config.THREADS); 
  Map<String, List<KafkaStream<byte[], byte[]>>> consumerMap = consumer.createMessageStreams(topicCountMap); 
  List<KafkaStream<byte[], byte[]>> streams = consumerMap.get(Config.TOPIC); 
   
  for(final KafkaStream<byte[], byte[]> kafkaStream : streams){ 
   new Thread(new Runnable() { 
    @Override 
    public void run() { 
     for(MessageAndMetadata<byte[], byte[]> mm : kafkaStream){ 
      String msg = new String(mm.message()); 
      System.out.println(msg); 
     } 
    } 
    
   }).start(); 
   
  } 
 } 
}