1、生产者 消费者pom

<!--spring boot 版本依赖-->
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.4.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.kafka</groupId>
        <artifactId>spring-kafka</artifactId>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
</dependencies>

2、生产者

application.yml:

spring:
  kafka:
    #生产者
    producer:
      #发送失败重试次数
      retries: 0
      #生产者批次投递大小  16384(16k)默认
      batch-size: 16384
      #生产缓冲区大小 默认值 (32M)
      buffer-memory: 33554432
      #配置序列化
      key-serializer: org.apache.kafka.common.serialization.StringSerializer
      value-serializer: org.apache.kafka.common.serialization.StringSerializer
    #kafka代理地址
    bootstrap-servers: 192.168.92.39:9092

KafkaProviderService

@Service
public class KafkaProviderService {
    @Autowired
    private KafkaTemplate kafkaTemplate;
    public void sendMsg() {
        for (int i = 1; i <= 50; i++) {
            kafkaTemplate.send("kafka-spring","spring-key", "hello spring boot");
        }
    }
}

测试类：

@RunWith(SpringRunner.class)
//主application方法
@SpringBootTest(classes=KafkaProviderApplication.class)
public class KafkaTest {
    @Autowired
    private KafkaProviderService kafkaProviderService;
    @Test
    public void mainTest(){
        kafkaProviderService.sendMsg();
    }
}

3、消费者

application.yml

spring:
  kafka:
    bootstrap-servers: 192.168.92.39:9092
    consumer:
      #组iD
      group-id: kafka-spring
      #反序列化
      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      #配置手动提交
      enable-auto-commit: false
    listener:
      ack-mode: manual

@Service
@Slf4j
public class KafkaCustomer {
    @KafkaListener(topics = {"kafka-spring"})
    public void listen(ConsumerRecord<?, ?> record, Acknowledgment ack) {
        try {
            log.info("自行确认方式收到消息的key: " + record.key());
            log.info("自行确认方式收到消息的value: " + record.value().toString());
          ack.acknowledge();
        } finally {
            log.info("消息确认！");
           
        }
    }
}

4、启动消费者生产者测试类