Spring Cloud Stream 中每个绑定的自定义密钥 serdes

Question

我正在尝试了解如何在 Spring Cloud Stream 中使用不同的密钥 serializer/deserializer。我找到了指定全局 serdes 的方法，但我不明白如何为每个绑定指定不同的 serdes，以允许不同的键类型（整数、字符串等）。例如，以下配置使用属性 spring.kafka.consumer.keyDeserializer 和 spring.kafka.producer.keySerializer 指定全局密钥 serdes：

spring:
  cloud:
    stream:
      bindings:
        input:
          contentType: application/*+avro
          destination: user                    
          group: my-group
        output:
          contentType: application/*+avro
          destination: user     
          producer:
            partition-count: 2      
      kafka:
        binder:
          brokers: default:9092
      schemaRegistryClient:
        endpoint: http://default:8081
  kafka:
    consumer:
      keyDeserializer: org.apache.kafka.common.serialization.StringDeserializer
    producer:
      keySerializer: org.apache.kafka.common.serialization.StringSerializer

我可以使用以下代码片段使用和生成消息密钥：

// Consumer
@StreamListener(Sink.INPUT)
    public void handle(@Payload UserValue user, @Headers Map<String, Object> headers,
            @Header(KafkaHeaders.RECEIVED_MESSAGE_KEY) String key) {
        System.out.println("Received: " + user + " with key: " + key + " and headers: " + headers);
    }

// Producer
UserValue user = UserValue.newBuilder().setName("Alessandro").setSurname("Dionisi").build();
        output.send(MessageBuilder.withPayload(user).setHeader(KafkaHeaders.MESSAGE_KEY, "1").build());

Answer 1

您可以通过 configuration 属性

spring.cloud.stream.kafka.bindings.<bindingName>.consumer.configuration.<whatever-kafka-property-name>=. . .

查看更多信息here

Spring Cloud Stream 中每个绑定的自定义密钥 serdes

Custom key serdes per binding in Spring Cloud Stream

spring-cloud-stream

spring-kafka