Question

在我的Spring Boot应用程序中，我使用以下发件人/接收器配置了Kafka：

@Configuration
public class KafkaSenderConfig {

    @Value("${spring.kafka.bootstrap-servers}")
    private String bootstrapServers;

    @Bean
    public Map<String, Object> producerConfigs() {

        Map<String, Object> props = new HashMap<>();

        props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
        props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
        props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, JsonSerializer.class);

        return props;
    }

    @Bean
    public ProducerFactory<String, ImportDecisionMessage> producerFactory() {
        return new DefaultKafkaProducerFactory<>(producerConfigs());
    }

    @Bean
    public KafkaTemplate<String, ImportDecisionMessage> kafkaTemplate() {
        return new KafkaTemplate<>(producerFactory());
    }

}

@Configuration
public class KafkaReceiverConfig {

    @Value("${spring.kafka.bootstrap-servers}")
    private String bootstrapServers;

    @Value("${spring.kafka.consumer.group-id}")
    private String consumerGroupId;

    @Bean
    public Map<String, Object> consumerConfigs() {

        Map<String, Object> props = new HashMap<>();

        props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
        props.put(ConsumerConfig.GROUP_ID_CONFIG, consumerGroupId);
        props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, JsonDeserializer.class);

        return props;
    }

    @Bean
    public ConsumerFactory<String, ImportDecisionMessage> consumerFactory() {
        return new DefaultKafkaConsumerFactory<>(consumerConfigs(), new StringDeserializer(), new JsonDeserializer<>(ImportDecisionMessage.class));
    }

    @Bean
    public ConcurrentKafkaListenerContainerFactory<String, ImportDecisionMessage> kafkaListenerContainerFactory() {

        ConcurrentKafkaListenerContainerFactory<String, ImportDecisionMessage> factory = new ConcurrentKafkaListenerContainerFactory<>();
        factory.setConsumerFactory(consumerFactory());

        return factory;
    }

}

现在基于此配置，我只能使用我的POJO - ImportDecisionMessage并使用JsonDeserializer序列化程序来发送/接收消息。

我还必须能够将其他POJO作为消息发送，例如Product，Car，Category

此外，我还要为org.apache.kafka.common.serialization.BytesSerializer使用其他Car。

如何正确扩展我的配置以支持这些类型和序列化程序？

Answer 1

这是不可能的，因为：

props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
    props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, JsonDeserializer.class);

确切地说是Apache Kafka属性。而那个只支持简单的简单反序列化策略。您应该从Kafka Consumer返回的原始byte[]中考虑下游的自定义逻辑。

Spring Kafka多个序列化器和消费者/容器工厂

1 个答案: