如何在Spring Boot中从AMQP的Json字节数组转换？

Question

之后，我有这段代码

@Bean
open fun messageConverter(om: ObjectMapper): MessageConverter {
    return Jackson2JsonMessageConverter(om)
}

@Bean
open fun rabbitListenerContainerFactory(cf: ConnectionFactory, mc: MessageConverter ): SimpleRabbitListenerContainerFactory {
    val factory = SimpleRabbitListenerContainerFactory()
    factory.setConnectionFactory(cf)
    factory.setMessageConverter(mc)
    return factory
}

@Bean
open fun builder(): Jackson2ObjectMapperBuilderCustomizer {
    return Jackson2ObjectMapperBuilderCustomizer {
        it.modules(JavaTimeModule(), KotlinModule())
        it.featuresToDisable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
    }
}

但我得到这个例外

org.springframework.amqp.rabbit.listener.exception.ListenerExecutionFailedException: Listener method could not be invoked with the incoming message
Endpoint handler details:
Method [public phg.entity.monitor.Foley phg.event.monitor.Provisioning.save(phg.entity.monitor.Foley)]
Bean [phg.event.monitor.Provisioning@2212e291]
    at org.springframework.amqp.rabbit.listener.adapter.MessagingMessageListenerAdapter.invokeHandler(MessagingMessageListenerAdapter.java:193) ~[spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.amqp.rabbit.listener.adapter.MessagingMessageListenerAdapter.onMessage(MessagingMessageListenerAdapter.java:127) ~[spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:1547) ~[spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.actualInvokeListener(AbstractMessageListenerContainer.java:1473) ~[spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:1461) ~[spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:1456) ~[spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.executeListener(AbstractMessageListenerContainer.java:1405) ~[spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.doReceiveAndExecute(SimpleMessageListenerContainer.java:870) [spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.receiveAndExecute(SimpleMessageListenerContainer.java:854) [spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$1600(SimpleMessageListenerContainer.java:78) [spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.mainLoop(SimpleMessageListenerContainer.java:1137) [spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1043) [spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at java.lang.Thread.run(Thread.java:748) [na:1.8.0_171]
Caused by: org.springframework.messaging.converter.MessageConversionException: Cannot convert from [[B] to [phg.entity.monitor.Foley] for GenericMessage [payload=byte[263], headers={amqp_receivedDeliveryMode=PERSISTENT, amqp_receivedRoutingKey=foley.new, amqp_receivedExchange=amq.topic, x-mqtt-publish-qos=1, x-mqtt-dup=false, amqp_deliveryTag=1, amqp_consumerQueue=foley.new, amqp_redelivered=false, id=c7fade5a-d803-166a-fe71-0a4f8abb8c4e, amqp_consumerTag=amq.ctag-9bkLtT_xhvQACuHqvx_izQ, timestamp=1551886588001}]
    at org.springframework.messaging.handler.annotation.support.PayloadArgumentResolver.resolveArgument(PayloadArgumentResolver.java:144) ~[spring-messaging-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.messaging.handler.invocation.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:117) ~[spring-messaging-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:147) ~[spring-messaging-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:116) ~[spring-messaging-5.1.5.RELEASE.jar:5.1.5.RELEASE]
    at org.springframework.amqp.rabbit.listener.adapter.HandlerAdapter.invoke(HandlerAdapter.java:49) ~[spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.amqp.rabbit.listener.adapter.MessagingMessageListenerAdapter.invokeHandler(MessagingMessageListenerAdapter.java:190) ~[spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    ... 12 common frames omitted

在我注意到它正在使用GenericMessageConverter且没有Jackson2JsonMessageConverter

Answer 1

根据您的堆栈跟踪，侦听器容器中与传入的JSON没有任何关系。因此，它发生，因为只是 通过
与byte[]作为pyalod。最终的结果只是尝试将其转换byte[]为方法中的预期类型@RabbitListener。为此，当您没有要在侦听器容器级别上转换的JSON信息时，您需要配置一个DefaultMessageHandlerMethodFactory带有required的MappingJackson2MessageConverter。可以通过以下方式实现RabbitListenerConfigurer：

    @Bean
    public DefaultMessageHandlerMethodFactory myHandlerMethodFactory() {
        DefaultMessageHandlerMethodFactory factory = new DefaultMessageHandlerMethodFactory();
        factory.setMessageConverter(new MappingJackson2MessageConverter());
        return factory;
    }


    @Override
    public void configureRabbitListeners(RabbitListenerEndpointRegistrar registrar) {
        registrar.setMessageHandlerMethodFactory(myHandlerMethodFactory());
    }

这MappingJackson2MessageConverter可以被配置为您的自定义豆ObjectMapper注射。