Kafka java 初级配置 及应用

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。