一、安裝

下載最新版kafka，Apache Kafka，然後上傳到Linux，我這裏有三臺機器，192.168.127.129,130,131 。

進入上傳目錄，解壓到/usr/local目錄下

tar -zxvf kafka_2.11-0.11.0.0.tgz -C /usr/local/

進入/usr/local目錄

cd /usr/local

然後改一下名字（這一步可有可無）

mv kafka_2.11-0.11.0.0/ kafka

進入kafka目錄，編輯配置文件

cd kafka/

vi config/server.properties

配置文件：有的地方三臺機器不一樣哦，不一樣的你都能看出來

編輯好之後，進入kafka目錄並且建立日誌目錄

mkdir kafka-logs

開啟kafka的通信端口9092

firewall-cmd --zone=public --add-port=9092/tcp --permanent

systemctl restart firewalld

啟動Zookeeper，如果你不知道Zookeeper安裝的話，就找我的文章，有一篇是關於Zookeeper安裝的。

然後啟動kafka

cd /usr/local/kafka/bin/
./kafka-server-start.sh /usr/local/kafka/config/server.properties &

最後出現

就是成功了，進入Zookeeper客戶端

除了activemq，zookeeper，dubbo，root，都是kafka相關的

二、入門

依賴jar包，請找到kafka的libs目錄

生產者：
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;

 
public class SimpleProducer {

    public static void main(String[] args) throws InterruptedException {
        Properties props = new Properties();
        props.put("bootstrap.servers", "192.168.127.129:9092,192.168.127.130:9092,192.168.127.131:9092");
        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<>(props);
        for (int i = 0; i < 10; i++){
            //ProducerRecord<String, String>(String topic, String key, String value)
            producer.send(new ProducerRecord<String, String>("my-topic", "fruit" + i, "banana" + i));
            Thread.sleep(1000);
        }
        producer.close();

    }
}

消費者：
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;

public class SimpleConsumer {

    public static void main(String[] args) {
        Properties props = new Properties();
        props.put("bootstrap.servers", "192.168.127.129:9092,192.168.127.130:9092,192.168.127.131:9092");
        props.put("group.id", "testGroup");
        props.put("enable.auto.commit", "true");
        props.put("auto.commit.interval.ms", "1000");
        props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
        //訂閱的topic，多個用逗號隔開
        consumer.subscribe(Arrays.asList("my-topic"));
        while (true) {
            ConsumerRecords<String, String> records = consumer.poll(100);
            for (ConsumerRecord<String, String> record : records)
                System.out.printf("offset = %d, key = %s, value = %s%n", record.offset(), record.key(), record.value());
        }
        //consumer.close();
    }
}

先啟動消費者，再啟動生產者

你會發現消費者每隔1秒輸出一行數據。

kafka安裝以及入門