Apache kafka之旅——java 发送接受消息

最新推荐文章于 2024-12-15 21:00:00 发布

老姚coding

最新推荐文章于 2024-12-15 21:00:00 发布

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分类专栏：开发技术文章标签： apache kafka java

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本文详细介绍了如何使用Maven引入Kafka依赖，通过编写KafkaProducer和KafkaConsumer类实现消息的发送与接收，并提供了完整的代码示例。包括配置、初始化及消息的发送与接收过程，确保了示例的可运行性。

一、新建maven项目，引用apache给定的pom文件，如下

<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.9.2</artifactId>
<version>0.8.1.1</version>
</dependency>

二新建发送消息类KafkaProducer.java代码如下:

import java.util.Properties;

import kafka.producer.KeyedMessage;
import kafka.producer.ProducerConfig;

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", "192.168.30.229:9092");
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();
}
}
}
}

三、新建接受消息类KafkaConsumer.java

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 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", "192.168.30.229:2181");
props.put("group.id", "group1");
props.put("zookeeper.session.timeout.ms", "1000000");
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();
}
}
}
}

四、新建KafkaConsumerProducerDemo，代码：

public class KafkaConsumerProducerDemo {
public static void main(String[] args)
{
KafkaProducer producerThread = new KafkaProducer("test");
producerThread.start();

KafkaConsumer consumerThread = new KafkaConsumer("test");
consumerThread.start();
}
}

以上的ip地址定要改成你的kafka服务器的ip

端口号2181 ，9092 一定要保证linux上对外开放，或者直接把防火墙关闭

运行第四步就可以实现了