kafka开发实例

1.启动kafka。

//启动zookeeper server (用&是为了能退出命令行)：
bin/zookeeper-server-start.sh config/zookeeper.properties  &
//启动kafka server: 
bin/kafka-server-start.sh config/server.properties  &

2.新建一个生产者例子

import java.util.Properties;
 
import kafka.javaapi.producer.Producer;
import kafka.producer.KeyedMessage;
import kafka.producer.ProducerConfig;
 
public class KafkaTest {
    public static void main(String[] args) { 
        Properties props = new Properties(); 
        props.put("zk.connect", "10.103.22.47:2181"); 
        props.put("serializer.class", "kafka.serializer.StringEncoder"); 
        props.put("metadata.broker.list", "10.103.22.47:9092");
        props.put("request.required.acks", "1");
        //props.put("partitioner.class", "com.xq.SimplePartitioner");
        ProducerConfig config = new ProducerConfig(props); 
        Producer<String, String> producer = new Producer<String, String>(config); 
        String ip = "192.168.2.3";
        String msg ="this is a messageuuu!";
        KeyedMessage<String, String> data = new KeyedMessage<String, String>("test", ip,msg); 
        producer.send(data);
        producer.close(); 
    } 
 
}

3.新建一个消费者例子

import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
 
import kafka.consumer.Consumer;
import kafka.consumer.ConsumerConfig;
import kafka.consumer.KafkaStream;
import kafka.javaapi.consumer.ConsumerConnector;
import kafka.message.Message;
import kafka.message.MessageAndMetadata;
 
 
public class ConsumerSample {
 
    public static void main(String[] args) { 
        // specify some consumer properties 
        Properties props = new Properties(); 
        props.put("zookeeper.connect", "10.103.22.47:2181"); 
        props.put("zookeeper.connectiontimeout.ms", "1000000"); 
        props.put("group.id", "test_group"); 
 
            // Create the connection to the cluster 
        ConsumerConfig consumerConfig = new ConsumerConfig(props); 
        ConsumerConnector connector = Consumer.createJavaConsumerConnector(consumerConfig); 
 
 
        Map<String,Integer> topics = new HashMap<String,Integer>(); 
        topics.put("test", 2); 
        Map<String, List<KafkaStream<byte[], byte[]>>> topicMessageStreams = connector.createMessageStreams(topics); 
        List<KafkaStream<byte[], byte[]>> streams = topicMessageStreams.get("test");
        ExecutorService threadPool = Executors.newFixedThreadPool(2); 
        for (final KafkaStream<byte[], byte[]> stream : streams) { 
            threadPool.submit(new Runnable() { 
                public void run() { 
                    for (MessageAndMetadata msgAndMetadata : stream) { 
                        // process message (msgAndMetadata.message()) 
                        System.out.println("topic: " + msgAndMetadata.topic()); 
                        Message message = (Message) msgAndMetadata.message(); 
                        ByteBuffer buffer = message.payload(); 
                        byte[] bytes = new byte[message.payloadSize()]; 
                        buffer.get(bytes); 
                        String tmp = new String(bytes); 
                        System.out.println("message content: " + tmp); 
                    } 
                } 
            }); 
        }   
    }
}