Question

我使用Spring Kafka 1.1.2-RELEASE和Spring Boot 1.5.0 RC，我已经配置了一个自定义值序列化器/解串器类，扩展了org.springframework.kafka.support.serializer.JsonSerializer / org.springframework.kafka.support.serializer.JsonDeserializer。这些类确实使用了Jackson ObjectMapper，它可以通过构造函数提供。

在某种程度上可以从我的Spring上下文中注入ObjectMapper吗？我已经配置了一个ObjectMapper，我想在serialiser / deserialiser中重用它。

Answer 1

您可以将JsonSerializer和JsonDeserializer配置为@Bean。向他们注入所需的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"
}

将ObjectMapper注入Spring Kafka serialiser / deserialiser

3 个答案: