java - 将 ObjectMapper 注入 Spring Kafka 序列化器/反序列化器

Question

我正在使用 Spring Kafka 1.1.2-RELEASE 和 Spring Boot 1.5.0 RC，并且我配置了一个自定义值序列化器/反序列化器类扩展org.springframework.kafka.support.serializer.JsonSerializer/ org.springframework.kafka.support.serializer.JsonDeserializer。这些类确实使用了可以通过构造函数提供的 Jackson ObjectMapper。

是否可以从我的 Spring 上下文中注入 ObjectMapper？我已经配置了一个 ObjectMapper，我想在序列化器/反序列化器中重用它。

Answer 1

您可以将JsonSerializer和配置JsonDeserializer为@Beans。给他们注入一个想要ObjectMapper的东西。DefaultKafkaProducerFactory并在和DefaultKafkaConsumerFactorybean 定义中使用这些 bean ：

    @Bean
    public ProducerFactory<Integer, String> producerFactory() {
        DefaultKafkaProducerFactory<Integer, String> producerFactory = 
                new DefaultKafkaProducerFactory<>(producerConfigs());
        producerFactory.setValueSerializer(jsonSerializer());
        return producerFactory;
    }

Answer 2

@Component
public class ObjectMapperProducerFactoryCustomizer implements DefaultKafkaProducerFactoryCustomizer {

    private final ObjectMapper objectMapper;

    public ObjectMapperProducerFactoryCustomizer(ObjectMapper objectMapper) {
        this.objectMapper = objectMapper;
    }

    @Override
    public void customize(DefaultKafkaProducerFactory<?, ?> producerFactory) {
        if (Objects.nonNull(producerFactory)) {
            producerFactory.setValueSerializer(new JsonSerializer<>(objectMapper));
        }
    }

}

Answer 3

对于反应式非阻塞 kafka 客户端，配置如下：

@Configuration
@EnableConfigurationProperties(KafkaProperties.class)
public class KafkaConfig {

    @Bean
    public ReactiveKafkaProducerTemplate<String, Object> kafkaProducerTemplate(KafkaProperties p,
                                                                               ObjectMapper objectMapper) {
        return new ReactiveKafkaProducerTemplate<>(
                SenderOptions.<String, Object>create(p.buildProducerProperties())
                        .withValueSerializer(new JsonSerializer<>(objectMapper)));
    }
}

以上暗示您正在使用io.projectreactor.kafkadep，

dependencies {
    compile "io.projectreactor.kafka:reactor-kafka"
}