1.导包pom

        <!-- https://mvnrepository.com/artifact/org.apache.kafka/kafka -->
        <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka_2.13</artifactId>
            <version>3.2.1</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.kafka/kafka-clients -->
        <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka-clients</artifactId>
            <version>3.2.1</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework.kafka/spring-kafka -->
        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>
            <version>2.9.0</version>
        </dependency>

2.配置文件application.yml

  kafka:
    producer:
      batch-size: 30
    consumer:
      group-id: test
    bootstrap-servers: 192.168.72.128:9092

3.生产者

@RestController
public class KafkaProducer {

    @Autowired
    KafkaTemplate<String,String> kafkaTemplate;

    @GetMapping("test/kafka/producer/{msg}")
    public String testKafkaProducer(@PathVariable("msg") String msg){
        kafkaTemplate.send("top_name","key",msg);
        return "ok";
    }
}

4.消费者

@Component
@Slf4j
public class KafkaConsumer {

    @KafkaListener(topics = {"top_name"})
    public void handMessage(ConsumerRecord<?,?> consumerRecord){
        Optional<?> optional = Optional.ofNullable(consumerRecord.value());
        if (optional.isPresent()) {
            Object msg = optional.get();
            log.info("message:{}", msg);
        }
    }
}

5.启动类

@SpringBootApplication(scanBasePackages = {"com.example.demo"})
@EnableAspectJAutoProxy(proxyTargetClass = true)
@EnableScheduling
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

}

6.打开浏览器访问

localhost:7070/test/kafka/producer/kangkang