搭建大型分布式服务（二十二）SpringBoot 如何优雅地整合多个kafka数据源？_springboot监听多个kafka源

系列文章目录

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前言

在日常开发当中，经常会遇到需要消费的topic不在同一个kafka集群内，这时候需要配置多个数据源，如何优雅地完成这个配置呢？
可以参考最新版本：最新版本

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一、本文要点

接前文，我们已经在项目里集成了kafka。本文将介绍如何优雅地整合多个kafka数据源。系列文章完整目录

• springboot 整合多个kafka数据源
• springboot 整合多个消费者topic
• kafka listener 配置factory

二、开发环境

• jdk 1.8
• maven 3.6.2
• springboot 2.4.3
• kafka 2.12-2.3
• idea 2020

三、创建项目

1、使用早期文章快速创建项目。

《搭建大型分布式服务（十二）Docker搭建开发环境安装Kafka和zookeeper》
《搭建大型分布式服务（十三）SpringBoot整合kafka》
《搭建大型分布式服务（十八）Maven自定义项目脚手架》

2、创建Ticket项目

mvn archetype:generate  -DgroupId="com.mmc.lesson" -DartifactId="ticket" -Dversion=1.0-SNAPSHOT -Dpackage="com.mmc.lesson" -DarchetypeArtifactId=member-archetype  -DarchetypeGroupId=com.mmc.lesson -DarchetypeVersion=1.0.0-SNAPSHOT -B
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四、修改项目

1、编写KafkaPropertiesConfiguration.java，用来接收两个kafka配置。

@Configuration
public class KafkaPropertiesConfiguration {

    /**
     * one的kafka配置.
     */
    @Bean("oneKafkaProperties")
    @ConfigurationProperties("spring.one.kafka")
    public CustomKafkaProperties oneKafkaProperties() {
        return new CustomKafkaProperties();
    }

    /**
     * two的kafka配置.
     */
    @Bean("twoKafkaProperties")
    @ConfigurationProperties("spring.two.kafka")
    public CustomKafkaProperties twoKafkaProperties() {
        return new CustomKafkaProperties();
    }


    @Data
    public static class CustomKafkaProperties {

        private final Consumer consumer = new Consumer();

        /**
         * Create an initial map of consumer properties from the state of this instance.
         * <p>
         * This allows you to add additional properties, if necessary, and override the
         * default kafkaConsumerFactory bean.
         *
         * @return the consumer properties initialized with the customizations defined on this
         *         instance
         */
        public Map<String, Object> buildConsumerProperties() {
            return new HashMap<>(this.consumer.buildProperties());
        }
    }
}

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2、编写KafkaConsumerConfiguration.java，定义两个消费工厂。

@Configuration
@AutoConfigureAfter(KafkaPropertiesConfiguration.class)
public class KafkaConsumerConfiguration {

    @Value("${spring.kafka.listener.type:batch}")
    private String listenerType;

    /**
     * 消费one数据.
     */
    @Bean("oneContainerFactory")
    public ConcurrentKafkaListenerContainerFactory<Object, Object> oneContainerFactory(
            @Qualifier("oneKafkaProperties")
                    CustomKafkaProperties kafkaProperties) {
        ConcurrentKafkaListenerContainerFactory<Object, Object> container =
                new ConcurrentKafkaListenerContainerFactory<>();
        container.setConsumerFactory(new DefaultKafkaConsumerFactory<>(kafkaProperties.buildConsumerProperties()));
        // 设置并发量，小于或等于Topic的分区数
        // container.setConcurrency(5);
        // 设置为批量监听
        container.setBatchListener("batch".equalsIgnoreCase(listenerType));
        return container;
    }

    /**
     * 消费two数据.
     */
    @Bean("twoContainerFactory")
    public ConcurrentKafkaListenerContainerFactory<Object, Object> twoContainerFactory(
            @Qualifier("twoKafkaProperties")
                    CustomKafkaProperties kafkaProperties) {
        ConcurrentKafkaListenerContainerFactory<Object, Object> container =
                new ConcurrentKafkaListenerContainerFactory<>();
        container.setConsumerFactory(new DefaultKafkaConsumerFactory<>(kafkaProperties.buildConsumerProperties()));
        // 设置并发量，小于或等于Topic的分区数
        // container.setConcurrency(5);
        // 设置为批量监听
        container.setBatchListener("batch".equalsIgnoreCase(listenerType));
        return container;
    }
}
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3、编写KafkaReceiver.java，消费两个topic的数据。

@Service
@Slf4j
public class KafkaReceiver {
    @KafkaListener(id = "kafka-one-demo",
            topics = Const.KAFKA_ONE_DEMO_TOPIC,
            groupId = "oneGroup",
            containerFactory = "oneContainerFactory")
    public void receiveOne(ConsumerRecord<String, String> record) {

        if (null == record || !StringUtils.hasText(record.value())) {

            log.warn("KafkaReceiver record is null or record.value is empty.");
            return;
        }

        String reqJson = record.value();
        log.info("one KafkaReceiver {}", reqJson);


    }

    @KafkaListener(id = "kafka-two-demo",
            topics = Const.KAFKA_TWO_DEMO_TOPIC,
            groupId = "twoGroup",
            containerFactory = "twoContainerFactory")
    public void receiveTwo(ConsumerRecord<String, String> record) {

        if (null == record || !StringUtils.hasText(record.value())) {

            log.warn("KafkaReceiver record is null or record.value is empty.");
            return;
        }

        String reqJson = record.value();
        log.info("two KafkaReceiver {}", reqJson);


    }
}
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4、修改application-dev.properties 增加双kafka配置，其它环境同理（可以放到Apollo托管）。

#################### KAFKA ####################

## 以下为消费者配置
spring.kafka.listener.type=single
spring.kafka.listener.missing-topics-fatal=false

spring.one.kafka.consumer.bootstrapServers=127.0.0.1:9092
spring.one.kafka.consumer.auto-offset-reset=latest
spring.one.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.one.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.one.kafka.consumer.max-poll-records=50

spring.two.kafka.consumer.bootstrapServers=127.0.0.1:9092
spring.two.kafka.consumer.auto-offset-reset=latest
spring.two.kafka.consumer.key-deserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.two.kafka.consumer.value-deserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.two.kafka.consumer.max-poll-records=50

## 以下为单元测试生产者配置
spring.kafka.producer.key-serializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.producer.value-serializer=org.apache.kafka.common.serialization.StringSerializer
spring.kafka.producer.buffer-memory=524288
spring.kafka.producer.batch-size=65536
spring.kafka.producer.bootstrap-servers=127.0.0.1:9092
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五、测试一下

1、修改并运行单元测试

@Slf4j
@ActiveProfiles("dev")
@ExtendWith(SpringExtension.class)
@SpringBootTest
class KafkaSenderTest {

    @Resource
    private KafkaSender kafkaSender;

    @Test
    void sendMessage() throws IOException {

        String json = "hello";

        for (int i = 0; i < 1; i++) {

            kafkaSender.sendMessage(Const.KAFKA_ONE_DEMO_TOPIC, json);
            kafkaSender.sendMessage(Const.KAFKA_TWO_DEMO_TOPIC, json);

        }

        System.in.read();

    }

}
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2、测试通过。

[2021-08-19 17:09:02.203] [kafka-two-demo-0-C-1] [INFO] [o.s.kafka.listener.KafkaMessageListenerContainer:292] - twoGroup: partitions assigned: [kafka-single-demo-topic-0]
[2021-08-19 17:09:02.203] [kafka-one-demo-0-C-1] [INFO] [o.s.kafka.listener.KafkaMessageListenerContainer:292] - oneGroup: partitions assigned: [kafka-single-demo-topic-0]
[2021-08-19 17:09:09.721] [kafka-two-demo-0-C-1] [INFO] [com.mmc.lesson.kafka.KafkaReceiver:?] - two KafkaReceiver hello
[2021-08-19 17:09:12.736] [kafka-one-demo-0-C-1] [INFO] [com.mmc.lesson.kafka.KafkaReceiver:?] - one KafkaReceiver hello

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六、小结

至此，我们就优雅地整合多个kafka消费者数据源，小伙伴们可以发挥自己的动手能力，配置多个生产者哦。下一篇《搭建大型分布式服务（二十三）SpringBoot 如何整合比GuavaCache性能好n倍的Caffeine并根据名称设置不同的失效时间？》

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