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，并且我配置了一个扩展

org.springframework.kafka.support.serializer.JsonSerializer

/

org.springframework.kafka.support.serializer.JsonDeserializer

的自定义值序列化器/反序列化器类。这些类确实使用 Jackson

ObjectMapper

，可以通过构造函数提供。

是否有可能从我的 Spring 上下文中注入

ObjectMapper

？我已经配置了一个

ObjectMapper

，我想在序列化器/解串器中重用它。

Answer 1

您可以将

JsonSerializer

和

JsonDeserializer

配置为

@Bean

。 向它们注入所需的

ObjectMapper

。并在

DefaultKafkaProducerFactory

和

DefaultKafkaConsumerFactory

bean 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.kafka

dep,

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