问答平台（5），Spring整合Kafka

引入依赖

<dependency>
    <groupId>org.springframework.kafka</groupId>
    <artifactId>spring-kafka</artifactId>
</dependency>

配置 Kafka

• 配置server、consumer

  # KafkaProperties
  spring.kafka.bootstrap-servers=localhost:9092
  spring.kafka.consumer.group-id=community-consumer-group
  spring.kafka.consumer.enable-auto-commit=true
  spring.kafka.consumer.auto-commit-interval=3000

---

访问 Kafka

• 生产者：

  kafkaTemplate.send(topic, data);

• 消费者：

  @KafkaListener(topics = {"test"}) 
  public void handleMessage(ConsumerRecord record) {}

---

测试类

// KafkaTests.java
@RunWith(SpringRunner.class)
@SpringBootTest
@ContextConfiguration(classes = CommunityApplication.class)
public class KafkaTests {

    @Autowired
    private KafkaProducer kafkaProducer;

    @Test
    public void testKafka() {
        kafkaProducer.sendMessage("test", "你好");
        kafkaProducer.sendMessage("test", "在吗");

        try {
            Thread.sleep(1000 * 10);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

@Component
class KafkaProducer {

    @Autowired
    private KafkaTemplate kafkaTemplate;

    public void sendMessage(String topic, String content) {
        kafkaTemplate.send(topic, content);
    }
}

@Component
class KafkaConsumer {

    @KafkaListener(topics = {"test"})
    public void handleMessage(ConsumerRecord record) {
        System.out.println(record.value());
    }
}