项目目录结构

pom.xml

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- Spring Kafka Starter -->
        <dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

kafka-provider

• application.yml

  server:
    port: 10001
  spring:
    kafka:
      bootstrap-servers: localhost:9092
      producer:
        key-serializer: org.apache.kafka.common.serialization.StringSerializer
        value-serializer: org.apache.kafka.common.serialization.StringSerializer
      consumer:
        key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
        value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
        group-id: test-consumer-group
  

• service

  @Service
  public class ProviderServiceImpl {
      private static final String TOPIC_NAME = "dragon-topic";
      @Resource
      private KafkaTemplate<String, String> kafkaTemplate;
  
      public String sendMsg(String info) {
          kafkaTemplate.send(TOPIC_NAME,info);
          return "发送成功";
      }
  }
  

  @RestController
  @RequestMapping("/provider")
  @RequiredArgsConstructor
  public class ProviderController {
      private final ProviderServiceImpl providerService;
      @GetMapping
      public String providerApi() {
          return providerService.sendMsg("莫等闲，白了少年头，空悲切。");
      }
  }
  

启动类

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

kafka-consumer

• kafka-listener

  @Component
  public class KafkaListener {
      private static final Logger log = LoggerFactory.getLogger(KafkaListener.class);
      private static final String TOPIC_NAME = "dragon-topic";
  
      @org.springframework.kafka.annotation.KafkaListener(topics = TOPIC_NAME)
      public void receive(String msg) {
          log.info("接收到消息：{}",msg);
      }
  }
  

• application.yml

  server:
    port: 10002
  spring:
    kafka:
      bootstrap-servers: localhost:9092
      producer:
        key-serializer: org.apache.kafka.common.serialization.StringSerializer
        value-serializer: org.apache.kafka.common.serialization.StringSerializer
      consumer:
        key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
        value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
        group-id: test-consumer-group
  

启动类

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