kafka安装以及入门demo

1.默认你已经安装了zookeeper3.4.8  and  关闭防火墙

kafka:2.9.2-0.8.2.1

kafka 官方下载地址 http://apache.fayea.com/kafka/0.8.2.1/kafka_2.9.2-0.8.2.1.tgz

tar -zxvf kafka_2.9.2-0.8.2.1.tgz -C /usr/local/ && mv kafka_2.9.2-0.8.2.1 kafka
cd /usr/local/kafka
vi config/zookeeper.properties

dataDir=/usr/local/kafka/zookeeper

vi config/server.properties
broker.id=0
port=9092
hostname=192.168.194.110
log.dirs=/usr/local/kafka/kafka-logs
zookeeper.connect=192.168.194.110:2181

　bin/kafka-server-start.sh config/server.properties &

查看启动状态

jps

　　

小DEMO

maven添加依赖

<dependency>  
         <groupId>org.apache.kafka</groupId>  
         <artifactId>kafka_2.10</artifactId>  
         <version>0.8.2.0</version>  
</dependency> 

 kafka消息生产者KafkaProducer

package kafka;

import java.util.Date;
import java.util.Properties;
import java.util.Random;
import kafka.javaapi.producer.Producer;
import kafka.producer.KeyedMessage;
import kafka.producer.ProducerConfig;

public class KafkaProducer extends Thread {
    public static void main(String[] args) {  
        Properties props = new Properties();
        props.put("metadata.broker.list", "176.20.32.51:9092");
        props.put("serializer.class", "kafka.serializer.StringEncoder");
        props.put("key.serializer.class", "kafka.serializer.StringEncoder");
        props.put("request.required.acks", "1");

        //配置key的序列化类
        ProducerConfig config = new ProducerConfig(props);
        Producer<String, String> producer = new Producer<String, String>(config);
        Random rnd = new Random();
        long runtime = new Date().getTime();        
        String ip = "176.20.32." + rnd.nextInt(255);
   
        String msg = runtime + ",www.example.com," + ip;
        KeyedMessage<String, String> data = new KeyedMessage<String, String>("test", "test-key",msg);
        producer.send(data);
    }
}

kafka消息消费者 KafkaConsumer 

package 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;
import kafka.serializer.StringDecoder;
import kafka.utils.VerifiableProperties;

public class KafkaConsumer {
	private static ConsumerConnector consumer = null;
	public static void main(String[] args) {
		Properties props = new Properties();
		// zookeeper 配置
		props.put("zookeeper.connect", "176.20.32.51:2181");
		// group 代表一个消费组
		props.put("group.id", "jd-group");
		// zk连接超时
		props.put("zookeeper.session.timeout.ms", "4000");
		props.put("zookeeper.sync.time.ms", "200");
		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);
		Map<String, Integer> topicCountMap = new HashMap<String, Integer>();
		topicCountMap.put("test", 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("test").get(0);
		ConsumerIterator<String, String> it = stream.iterator();
		while (it.hasNext())
			System.out.println(it.next().message());
	}
}

 分别启动producer 和consumer 即可进行简单的消息发送和接收

log4j:WARN No appenders could be found for logger (kafka.utils.VerifiableProperties).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
1441952197141,www.example.com,192.168.2.126