kafka|2.springboot集成kafka

项目目录

 

1.引入依赖

        
            org.springframework.boot
            spring-boot-starter-web
        
        
        
            org.springframework.kafka
            spring-kafka
        
        
            com.alibaba
            fastjson
            1.2.54
        
        
            org.projectlombok
            lombok
        

2.配置yaml文件

server:
  port: 8081

spring:
  application:
    name: kafka-springboot
  # kafka配置信息
  kafka:
    bootstrap-servers: 127.0.0.1:9092 # 集群用逗号分隔
    producer: # 生产者
      retries: 3 # 失败重试次数
      batch-size: 16384
      buffer-memory: 33554432
      acks: 1
      # 指定消息key和消息体的编解码方式
      key-serializer: org.apache.kafka.common.serialization.StringSerializer
      value-serializer: org.apache.kafka.common.serialization.StringSerializer
    consumer: # 消费者
      group-id: default-group # 消费组
      enable-auto-commit: false
      # auto-offset-reset: earliest
      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
      value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
    listener:
      ack-mode: MANUAL_IMMEDIATE

（此处的127.0.0.1替换成自己的服务器地址）

3.定义一个实体类：

@Data
@Accessors(chain = true)
public class UserLog {
    private String username;
    private String userid;
    private String state;
}

4.定义生产者

@Component
public class UserLogProducer {
    @Autowired
    private KafkaTemplate kafkaTemplate;

    /**
     * 发送数据        * @param userid
     */
    public void sendLog(String userid) {
        UserLog userLog = new UserLog();
        userLog.setUsername("jhp").setUserid(userid).setState("0");
        System.err.println("发送用户日志数据:" + userLog);
        kafkaTemplate.send("austin", JSON.toJSONString(userLog));
    }
}

5.定义消费者

@Component
@Slf4j
public class UserLogConsumer {
    @KafkaListener(topics = {"austin"}, groupId = "austinGroup1")
    public void consumer(ConsumerRecord consumerRecord) {        //判断是否为null
        Optional kafkaMessage = Optional.ofNullable(consumerRecord.value());
        log.info(">>>>>>>>>> record =" + kafkaMessage);
        //判断对象是否存在
        if (kafkaMessage.isPresent()) {
            //得到Optional实例中的值
            Object message = kafkaMessage.get();
            System.err.println("消费消息:" + message);
        }
    }
}

6.定义接口

@RestController
public class KafkaTestController {
    @Autowired
    private UserLogProducer userLogProducer;

    /**
     * test insert
     */
    @GetMapping("/kafka/insert")
    public String insert(String userId) {
        userLogProducer.sendLog(userId);
        return null;
    }
}

7. 测试：http://localhost:8081/kafka/insert?userId=kkk