KafKa entry program

Start KafKa

Download the decompressed version of KafKa and decompress it locally.

Write zk startup script

./zookeeper-server-start …/…/config/zookeeper.properties

Write kafka startup script

./kafka-server-start …/…/config/server.properties

Start zk

Start kafka

Import dependencies

<dependencies>
        <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka-clients</artifactId>
            <version>0.10.1.1</version>
        </dependency>
    </dependencies>

Producer program

public class Product {


    public static void main(String[] args) {

        Properties properties = new Properties();

        properties.put("bootstrap.servers", "127.0.0.1:9092");
        properties.put("key.serializer", StringSerializer.class);
        properties.put("value.serializer", StringSerializer.class);


        KafkaProducer producer = null;

        try {
            producer = new KafkaProducer(properties);
            ProducerRecord record = new ProducerRecord("topic1","info", "hello");
            producer.send(record);
        } finally {
            producer.close();
        }

    }

}

Consumer program

public class Consumer {

    public static void main(String[] args) {
        Properties properties = new Properties();

        properties.put("bootstrap.servers", "127.0.0.1:9092");
        properties.put("key.deserializer", StringDeserializer.class);
        properties.put("value.deserializer", StringDeserializer.class);
        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "test1");


        KafkaConsumer consumer = new KafkaConsumer(properties);
        consumer.subscribe(Collections.singleton("topic1"));

        while (true) {

            ConsumerRecords poll = consumer.poll(100);
            poll.forEach(it -> System.out.println(it));
        }


    }
}

result

The consumer successfully received the message sent by the producer.