spring boot 集成kafka

1、先解决依赖

springboot相关的依赖我们就不提了，和kafka相关的只依赖一个spring-kafka集成包

<dependency>
            <groupId>org.springframework.kafka</groupId>
            <artifactId>spring-kafka</artifactId>
            <version>2.2.0.RELEASE</version>
</dependency>

 这里我们先把配置文件展示一下

#============== kafka producer===================
spring.kafka.producer.bootstrap-servers=localhost:9092
spring.kafka.producer.retries=1
spring.kafka.producer.batch-size=16384
spring.kafka.producer.buffer-memory=33554432
spring.kafka.producer.properties.max.requst.size=2097152
spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer
#=============== consumer  =======================
spring.kafka.consumer.bootstrap-servers=localhost:9092
spring.kafka.consumer.group-id=0
spring.kafka.consumer.auto-offset-reset=earliest
spring.kafka.consumer.enable-auto-commit=true
spring.kafka.consumer.auto-commit-interval=100
#=======set comsumer max fetch.byte 2*1024*1024=============
spring.kafka.consumer.properties.max.partition.fetch.bytes=2097152

2、Kafka producer 

@Order(value = 1)
@Component
@Slf4j
public class Producer implements CommandLineRunner {

    @Autowired
    private KafkaTemplate<String, Object> kafkaTemplate;

    @Override
    public void run(String... strings) throws Exception {
        while (true) {
            log.info("kafka的消息");
            kafkaTemplate.send("test", "zhugezifang");
            log.info("发送kafka成功.");
            Thread.sleep(5000);
        }

    }
}

3、kafka consumer

@Component
@Slf4j
public class Consumer {

    @KafkaListener(topics = {"test"})
    public void listen(ConsumerRecord<?, ?> record) {
        log.info("topic:{}, offset:{}, value:{}", record.topic(), record.offset(), record.value());
    }
}