一、环境搭建
a. kafka下载kafka_2.9.2-0.8.2.1.gz 解压压缩包于 E 盘,可百度官网下载, 百度云盘分享地址 http://pan.baidu.com/s/1o71iSdG
b.制作启动服务bat 文件方便每次启动服务,
(1)kafka_zookeeper.bat
@echo off
E:
cd kafka_2.9.2-0.8.2.1\bin\windows
zookeeper-server-start.bat ..\..\config\zookeeper.properties
(2)kafka_service.bat
@echo off
E:
cd kafka_2.9.2-0.8.2.1\bin\windows
kafka-server-start.bat ..\..\config\server.properties
c.分别依次点击 kafka_zookeeper.bat 文件和 kafka_service.bat 文件,可看到两个不同的 运行窗口
二、初级Demo 实现。
所需jar 包,可在 http://pan.baidu.com/s/1o71iSdG 找到 kafka_2.10-0.8.2.1.jar
1、构建Kafka常量配置类
public interface KafkaProperties {
final static String zkConnect = "127.0.0.1:2181";
final static String groupId = "group1";
final static String topic = "topic1";
final static String kafkaServerURL = "127.0.0.1";
final static int kafkaServerPort = 9092;
final static int kafkaProducerBufferSize = 64 * 1024;
final static int connectionTimeOut = 20000;
final static int reconnectInterval = 10000;
final static String topic2 = "topic2";
final static String topic3 = "topic3";
final static String clientId = "SimpleConsumerDemoClient";
}
2、编写生产者代码
import java.util.Properties;
import kafka.producer.KeyedMessage;
import kafka.producer.ProducerConfig;
/**
* TODO:
* @author liyong
* @Date 2016年1月20日 下午5:39:35
*/
public class KafkaProducer extends Thread {
private final kafka.javaapi.producer.Producer<Integer, String> producer;
private final String topic;
private final Properties props = new Properties();
public KafkaProducer(String topic) {
props.put("serializer.class", "kafka.serializer.StringEncoder");
props.put("metadata.broker.list", "127.0.0.1:9092");
producer = new kafka.javaapi.producer.Producer<Integer, String>(new ProducerConfig(props));
this.topic = topic;
}
@Override
public void run() {
int messageNo = 1;
while (true) {
String messageStr = new String("Message_" + messageNo);
System.out.println("Send:" + messageStr);
producer.send(new KeyedMessage<Integer, String>(topic, messageStr));
messageNo++;
try {
sleep(3000);
}
catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
3、编写消费者代码
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;
/**
* TODO:
* @author liyong
* @Date 2016年1月20日 下午5:40:37
*/
public class KafkaConsumer extends Thread {
private final ConsumerConnector consumer;
private final String topic;
public KafkaConsumer(String topic) {
consumer = kafka.consumer.Consumer.createJavaConsumerConnector(createConsumerConfig());
this.topic = topic;
}
private static ConsumerConfig createConsumerConfig() {
Properties props = new Properties();
props.put("zookeeper.connect", KafkaProperties.zkConnect);
props.put("group.id", KafkaProperties.groupId);
props.put("zookeeper.session.timeout.ms", "40000");
props.put("zookeeper.sync.time.ms", "200");
props.put("auto.commit.interval.ms", "1000");
return new ConsumerConfig(props);
}
@Override
public void run() {
Map<String, Integer> topicCountMap = new HashMap<String, Integer>();
topicCountMap.put(topic, new Integer(1));
Map<String, List<KafkaStream<byte[], byte[]>>> consumerMap = consumer.createMessageStreams(topicCountMap);
KafkaStream<byte[], byte[]> stream = consumerMap.get(topic).get(0);
ConsumerIterator<byte[], byte[]> it = stream.iterator();
while (it.hasNext()) {
System.out.println("receive:" + new String(it.next().message()));
try {
sleep(3000);
}
catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
4.编写测试代码Demo
/**
* TODO:
* @author liyong
* @Date 2016年1月20日 下午5:41:45
*/
public class KafkaConsumerProducerDemo {
public static void main(String[] args){
KafkaProducer producerThread = new KafkaProducer(KafkaProperties.topic);
producerThread.start();
KafkaConsumer consumerThread = new KafkaConsumer(KafkaProperties.topic);
consumerThread.start();
}
}
点击测试类 KafkaConsumerProducerDemo.java 代码 测试,查看控制台测试结果
至此,小型案例 编写测试已完成。