springboot+kafka最简易入门Demo

1.pom.xml中加入kafka依赖：

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

2.application.properties中配置kafka（只有在第一次使用kafka生产、消费数据时才会生效，容器启动时是不会加载生效的）：

## kafka ##
spring.kafka.bootstrap-servers=127.0.0.1:9092
spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.consumer.group-id=test
spring.kafka.consumer.enable-auto-commit=true
spring.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.kafka.topic=mqtt_location_data

3.kafka消息生产者：

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import org.springframework.util.concurrent.ListenableFuture;

/**
 * @description: kafka生产者
 * @author: 
 * @create: 2019-01-29 17:38
 **/
@Component
@Slf4j
public class KafkaProducer {

    @Autowired
    KafkaTemplate kafkaTemplate;

    @Value("${spring.kafka.topic}")
    private String topic;


    /**
     * 发送kafka消息
     *
     * @param jsonString
     */
    public void send(String jsonString) {
        ListenableFuture future = kafkaTemplate.send(topic, jsonString);
        //future.addCallback(o -> log.info("kafka消息发送成功：" + jsonString), throwable -> log.error("kafka消息发送失败：" + jsonString));
    }


}

4.kafka消息消费者：

import lombok.extern.slf4j.Slf4j;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.stereotype.Component;

/**
 * @description: kafka消费者
 * @author: 
 * @create: 2019-01-29 17:47
 **/
@Component
@Slf4j
public class KafkaConsumer {

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


}

5.启动类测试：

import kafka.producer.KafkaProducer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;

/**
 * ClassName: SpringBootApplication
 * description:
 * author: 
 * date: 2018-09-30 09:15
 **/
@org.springframework.boot.autoconfigure.SpringBootApplication//@EnableAutoConfiguration @ComponentScan
public class SpringBootApplication implements CommandLineRunner {

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

    @Autowired
    KafkaProducer kafkaProducer;

    @Override
    public void run(String... args) throws Exception {
        for (int i = 0; i < 10; i++) {
            kafkaProducer.send("hello world" + i);
        }
    }
}

结果：