Hello, Kafka World

Producer.java

package com.favccxx.isoft.favkafka;
import java.util.Properties;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
 * Hello Producer
 * 
 * @author favccxx
 *
 */
public class Producers {
    private static Logger logger = LoggerFactory.getLogger(Producers.class);
    public static void main(String[] args) {
        try {
            // Get the Producer
            Properties props = new Properties();
            props.put("bootstrap.servers", "10.0.10.5:9092");
            props.put("acks", "all");
            props.put("retries", 0);
            props.put("batch.size", 16384);
            props.put("linger.ms", 1);
            props.put("buffer.memory", 33554432);
            props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
            props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");
            Producer<String, String> producer = new KafkaProducer<String, String>(props);
            for (int i = 0; i < 100; i++)
                producer.send(new ProducerRecord<String, String>("fav-topic", "boy-" + i, "gril-" + i));
            producer.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

输出内容

[TRACE~16:30][main] Sending record ProducerRecord(topic=fav-topic, partition=null, key=boy-1, value=gril-1 with callback null to topic fav-topic partition 0  [org.apache.kafka.clients.producer.KafkaProducer][2016-03-31] [TRACE~16:30][main] Sending record ProducerRecord(topic=fav-topic, partition=null, key=boy-2, value=gril-2 with callback null to topic fav-topic partition 0  [org.apache.kafka.clients.producer.KafkaProducer][2016-03-31] [TRACE~16:30][main] Sending record ProducerRecord(topic=fav-topic, partition=null, key=boy-3, value=gril-3 with callback null to topic fav-topic partition 0  [org.apache.kafka.clients.producer.KafkaProducer][2016-03-31] ...

Consumer.java

package com.favccxx.isoft.favkafka;
import java.util.Arrays;
import java.util.Properties;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class Consumer {
    static Logger logger = LoggerFactory.getLogger(Consumer.class);
    private static KafkaConsumer<String, String> consumer;
    public static void main(String[] args) {
        Properties props = new Properties();
        props.put("bootstrap.servers", "10.0.10.5:9092");
        props.put("group.id", "test");
        props.put("enable.auto.commit", "true");
        props.put("auto.commit.interval.ms", "1000");
        props.put("session.timeout.ms", "30000");
        props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        consumer = new KafkaConsumer<String, String>(props);
        consumer.subscribe(Arrays.asList("fav-topic"));
         while (true) {
             ConsumerRecords<String, String> records = consumer.poll(100);
             for (ConsumerRecord<String, String> record : records)
                 logger.debug("@@@@@@@@@@@@@@@@@@" + record.key() + ":" + record.value());
         }
    }
}

输出内容

[DEBUG~16:30][main] @@@@@@@@@@@@@@@@@@boy-0:gril-0  [com.favccxx.isoft.favkafka.Consumer][2016-03-31] [DEBUG~16:30][main] @@@@@@@@@@@@@@@@@@boy-1:gril-1  [com.favccxx.isoft.favkafka.Consumer][2016-03-31] [DEBUG~16:30][main] @@@@@@@@@@@@@@@@@@boy-2:gril-2  [com.favccxx.isoft.favkafka.Consumer][2016-03-31] ...

备注：如果在练习过程中出现java.net.ConnectException: Connection timed out: no further information这样的信息，一个是服务器地址不正确，另外可能就是启动Kafka服务器时没有指定host.name和advertised.host.name，具体操作在上篇文章中有详细描述。