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[Apache Kafka]代码实例

13-10-13 来源：[db:作者]

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前提：

已经配置好kafka。若未安装，可以参照【Apache Kafka】安装升级指南

已在eclipse里面安装scala插件。Eclipse Kepler中在Help->Eclipse Markectplace中搜索Scalar，然后安装即可。

使用maven构建kafka测试project在eclipse中。

创建topic：在kafka的安装目录下执行bin/kafka-create-topic.sh --zookeeper 192.168.20.99:2181 --replica 1 --partition 1 --topic test

启动consumer：在kafka的安装目录下执行bin/kafka-console-consumer.sh --zookeeper 192.168.20.99:2181 --topic test --from-beginning

pom.xml文件如下：

所有kafka依赖的jar包都在com.sksamuel.kafka下面。其中kafka使用的版本是0.8.0-beta1，kafka是2.10。

[html]

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

<groupId>com.iflytek.cpcloud.kafka</groupId>

<artifactId>kafkatest</artifactId>

<version>0.0.1-SNAPSHOT</version>

<name>kafkatest</name>

<url>http://maven.apache.org</url>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

</properties>

</dependency>

<groupId>com.sksamuel.kafka</groupId>

<artifactId>kafka_2.10</artifactId>

</dependency>

</dependencies>

</project>

然后写一个kafka producer的测试程序如下：

[java]

package com.iflytek.cpcloud.kafka.kafkatest;

import java.util.Properties;

import kafka.javaapi.producer.Producer;

import kafka.producer.KeyedMessage;

import kafka.producer.ProducerConfig;

/**

* Test the Kafka Producer

* @author jcsong2

public class ProducerTest {

public static void main(String[] args) {

Properties props = new Properties();

props.put("zk.connect", "192.168.20.99:2181");

props.put("serializer.class", "kafka.serializer.StringEncoder");

props.put("metadata.broker.list", "192.168.20.99:9092");

ProducerConfig config = new ProducerConfig(props);

Producer<String, String> producer = new Producer<String, String>(config);

for (int i = 0; i < 10; i++)

producer.send(new KeyedMessage<String, String>("test", "test" + i));

}

在consuemr端可以看到test0到test9十行输出。

再写一个kafka consumer的测试程序如下：

[java]

package com.iflytek.cpcloud.kafka.kafkatest;

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 ConsumerTest extends Thread {

private final ConsumerConnector consumer;

private final String topic;

public static void main(String[] args) {

ConsumerTest consumerThread = new ConsumerTest("test");

consumerThread.start();

}

public ConsumerTest(String topic) {

consumer = kafka.consumer.Consumer

.createJavaConsumerConnector(createConsumerConfig());

this.topic = topic;

}

private static ConsumerConfig createConsumerConfig() {

Properties props = new Properties();

props.put("zookeeper.connect", "192.168.20.99:2181");

props.put("group.id", "0");

props.put("zookeeper.session.timeout.ms", "400000");

props.put("zookeeper.sync.time.ms", "200");

props.put("auto.commit.interval.ms", "1000");

return new ConsumerConfig(props);

}

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(new String(it.next().message()));

}

在kafka-console-producer端输入的数据会回显到eclipse的console中。

以上程序参考kafka-0.8.0-bata1中的example。

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