kafka之java编程模型

package com.ganglia.kafka;

import java.util.Date;
import java.util.Properties;

import kafka.javaapi.producer.Producer;
import kafka.producer.KeyedMessage;
import kafka.producer.ProducerConfig;
   
public class ProducerTest2 {   
     
        public static void main(String[] args) {   
            Properties props = new Properties();   
            props.setProperty("metadata.broker.list","bfdbjc1:9092,test1:9092,test2:9092");   
            props.setProperty("serializer.class","kafka.serializer.StringEncoder");   
            ProducerConfig config = new ProducerConfig(props);   
            Producer<String, String> producer = new Producer<String, String>(config);   
            try {   
                int i =1; 
                while(true){ 
                    i++;
                    String text = new StringBuffer((i+"")).reverse()+":test-kafka_"+args[0]+"_"+i;
                    KeyedMessage<String, String> data = new KeyedMessage<String, String>("test",text);   
                    producer.send(data);   
                    Thread.sleep(100);
                    System.out.println(DateUtil.fmtDateToYMDHMS(new Date())+"\t"+text);
                } 
            } catch (Exception e) {   
                e.printStackTrace();   
            }   
            producer.close();   
        }   
}

 

1.安装zookeeper.

2.启动zookeeper.

3.启动kafka服务, 在zk1,zk2,zk3上分别运行：
   kafka-server-start.sh  ../config/server.properties /启动kafka
4. 新建一个TOPIC(replication-factor=num of brokers)
   kafka-topics.sh --create --topic test --replication-factor 3 --partitions 2 --zookeeper zk1:2181
5.假设我们在zk2上，开一个终端，发送消息至kafka
   kafka-console-producer.sh --broker-list zk1:9092 --sync --topic test
  在发送消息的终端输入：Hello Kafka
6.假设我们在zk3上，开一个终端，显示消息的消费（zk3模拟consumer）
   kafka-console-consumer.sh --zookeeper zk1:2181 --topic test --from-beginning

 

 

package com.ganglia.kafka;

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;
   
public class TestConsumer extends Thread{   
        private final ConsumerConnector consumer;   
        private final String topic;   
     
        public static void main(String[] args) {   
            TestConsumer consumerThread = new TestConsumer("test");   
            consumerThread.start();   
        }   
        public TestConsumer(String topic) {   
            consumer =kafka.consumer.Consumer.createJavaConsumerConnector(createConsumerConfig());   
            this.topic =topic;   
        }   
     
    private static ConsumerConfig createConsumerConfig() {   
        Properties props = new Properties();   
        props.put("zookeeper.connect","test1:2181,test2:2181,bfdbjc1:2181");   
        props.put("group.id", "0");   
        props.put("zookeeper.session.timeout.ms","10000");   
        return new ConsumerConfig(props);   
    }   
     
    public void run(){   
        Map<String,Integer> topickMap = new HashMap<String, Integer>();   
        topickMap.put(topic, 1);   
        Map<String, List<KafkaStream<byte[],byte[]>>>  streamMap =consumer.createMessageStreams(topickMap);   
        KafkaStream<byte[],byte[]>stream = streamMap.get(topic).get(0);   
        ConsumerIterator<byte[],byte[]> it =stream.iterator();   
        System.out.println("*********Results********");   
        while(true){   
            if(it.hasNext()){ 
               /* MessageAndMetadata<byte[], byte[]> mm = it.next();
                System.err.println("get data:" +new String(mm.message())); */  
                System.err.println("get data:" +new String(it.next().message()));
            } 
             
        }   
    }   
}