このチュートリアルでは、非常にシンプルかつ迅速な経験を体験します。

要件

割賦

$ brew tap adoptopenjdk/openjdk
$ brew cask install adoptopenjdk8

$ brew install kafka

$ zookeeper-server-start /usr/local/etc/kafka/zookeeper.properties

$ kafka-server-start /usr/local/etc/kafka/server.properties

$ kafka-topics --bootstrap-server localhost:9092 --topic <enter-a-topic> --create --partitions 1 --replication-factor 1

SpringbootでMavenプロジェクトを作成する

アパッチカフカ依存症のためにスプリングウェブと春を選んでください

Kafkaプロデューサーと消費者を構成してください

spring.datasource.url=jdbc:mysql://localhost:3306/<your-db-name>?allowPublicKeyRetrieval=true&useSSL=false&serverTimezone=UTC
spring.datasource.username=<your-db-username>
spring.datasource.password=<your-db-password>

app.topic=<same-topic-created-in-terminal>

spring.kafka.bootstrap-servers=localhost:9092
spring.kafka.groupId=<any-group-id>

spring.kafka.consumer.bootstrap-servers=localhost:9092
spring.kafka.consumer.group-id=<any-group-id>
spring.kafka.consumer.auto-offset-reset=earliest
spring.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer

spring.kafka.producer.bootstrap-servers=localhost:9092
spring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer

kafka-topics --bootstrap-server localhost:9092 --topic <same-topic-in-application.properties> --create --partitions 1 --replication-factor 1

カフカプロデューサー＆レシーバー

package <enter-your-package-here>;

import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.stereotype.Service;
import java.util.ArrayList;
import java.util.List;
@Service
public class KafkaConsumer {
    public static List<String> messages = new ArrayList<>();
    private final static String topic = "<same-topic-in-resources>";
    private final static String groupId = "<same-group-id>";

    @KafkaListener(topics = topic, groupId = groupId)
    public void listen(String message) {
        messages.add(message);
    }
}

package <enter-your-package-here>;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.stereotype.Service;

@Service
public class KafkaProducer {

    @Autowired
    private KafkaTemplate<String, String> kafkaTemplate;

    @Value("${app.topic}")
    private String topic;

    public void produce(String message) {
        kafkaTemplate.send(topic, message);
    }
}

クリエーターカフカ

package server.controller;

import org.springframework.web.bind.annotation.*;

import server.service.KafkaConsumer;
import server.service.KafkaProducer;

import org.springframework.beans.factory.annotation.Autowired;

import java.util.List;

@RestController
public class KafkaController {
  @Autowired
  private KafkaConsumer consumer;

  @Autowired
  private KafkaProducer producer;

  @PostMapping("/send")
  public void send(@RequestBody String data) {
    producer.produce(data);
  }
  @GetMapping("/receive")
  public List<String> receive() {
    return consumer.messages;
  }

  public KafkaConsumer getConsumer() {
    return consumer;
  }

  public KafkaProducer getProducer() {
    return producer;
  }

  public void setConsumer(KafkaConsumer consumer) {
    this.consumer = consumer;
  }

  public void setProducer(KafkaProducer producer) {
    this.producer = producer;
  }
}

最終プロジェクト構造

テスト

$ kafka-console-consumer --bootstrap-server localhost:9092 --topic <enter-your-topic> --from-beginning

{
   "message": "Hello from Postman"
}

$ kafka-console-producer --broker-list localhost:9092 --topic <enter-your-topic>
> Hello from the terminal

完了＆おめでとう！