Question

将Spring Integration 4.0.3.RELEASE与Jackson2一起使用，我试图将Json Transformers与http网关结合使用。

我的路径看起来类似于Spring Integration文档中引用的amqp适配器，但是使用http网关（1）：

...-＆GT;对象到JSON-变压器 - ＆GT; HTTP的出站网关----＆GT;

----＆GT; HTTP的入站网关 - ＆GT; JSON到对象的变压器 - ＆GT;

客户端：

<int:chain id="messageTransformerChain" input-channel="toServer" output-channel="messagesToServer">
    ...
    <int:object-to-json-transformer />
</int:chain>

<int-http:outbound-gateway id="httpOutToSever"
    request-channel="messagesToServer"
    reply-channel="replyFromServer"
    url="${server.endpoint}"
    http-method="POST"
    extract-request-payload="true"
    expected-response-type="java.lang.String" />

服务器：

<int-http:inbound-gateway id="httpInboundFromClientGateway"
    supported-methods="GET, POST"
    request-channel="fromClientChannel" />

<int:chain input-channel="fromClientChannel">
    <int:json-to-object-transformer />
    ...
</int:chain>

我得到的例外是（我认为相关的是粗体）：

2014-08-22T23：58：21.640-0400警告[http-bio-8080-exec-2] o.s.i.h.i.HttpRequestHandlingMessagingGateway失败发生在网关sendAndReceive org.springframework.integration.transformer.MessageTransformationException：无法转换消息 org.springframework.integration.transformer.AbstractTransformer.transform（AbstractTransformer.java:44）〜[spring-integration-core-4.0.3.RELEASE.jar：na] at org.springframework.integration.transformer.MessageTransformingHandler.handleRequestMessage（MessageTransformingHandler.java:68）〜[spring-integration-core-4.0.3.RELEASE.jar：na] at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal（AbstractReplyProducingMessageHandler.java:170）〜[spring-integration-core-4.0.3.RELEASE.jar：na] at org.springframework.integration.handler.AbstractMessageHandler.handleMessage（AbstractMessageHandler.java:78）〜[spring-integration-core-4.0.3.RELEASE.jar：na] at org.springframework.integration.handler.MessageHandlerChain.handleMessageInternal（MessageHandlerChain.java:131）〜[spring-integration-core-4.0.3.RELEASE.jar：na] at org.springframework.integration.handler.AbstractMessageHandler.handleMessage（AbstractMessageHandler.java:78）〜[spring-integration-core-4.0.3.RELEASE.jar：na] at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch（AbstractDispatcher.java:116）〜[spring-integration-core-4.0.3.RELEASE.jar：na] at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch（UnicastingDispatcher.java:101）〜[spring-integration-core-4.0.3.RELEASE.jar：na] at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch（UnicastingDispatcher.java:97）〜[spring-integration-core-4.0.3.RELEASE.jar：na] at org.springframework.integration.channel.AbstractSubscribableChannel.doSend（AbstractSubscribableChannel.java:77）〜[spring-integration-core-4.0.3.RELEASE.jar：na] at org.springframework.integration.channel.AbstractMessageChannel.send（AbstractMessageChannel.java:255）〜[spring-integration-core-4.0.3.RELEASE.jar：na] at org.springframework.messaging.core.GenericMessagingTemplate.doSend（GenericMessagingTemplate.java:109）〜[spring-messaging-4.0.6.RELEASE.jar：4.0.6.RELEASE] at org.springframework.messaging.core.GenericMessagingTemplate.doSendAndReceive（GenericMessagingTemplate.java:144）〜[spring-messaging-4.0.6.RELEASE.jar：4.0.6.RELEASE] at org.springframework.messaging.core.GenericMessagingTemplate.doSendAndReceive（GenericMessagingTemplate.java:44）〜[spring-messaging-4.0.6.RELEASE.jar：4.0.6.RELEASE] at org.springframework.messaging.core.AbstractMessagingTemplate.sendAndReceive（AbstractMessagingTemplate.java:75）〜[spring-messaging-4.0.6.RELEASE.jar：4.0.6.RELEASE] at org.springframework.integration.gateway.MessagingGatewaySupport.doSendAndReceive（MessagingGatewaySupport.java:250） [spring-integration-core-4.0.3.RELEASE.jar：na] at org.springframework.integration.gateway.MessagingGatewaySupport.sendAndReceiveMessage（MessagingGatewaySupport.java:224） [spring-integration-core-4.0.3.RELEASE.jar：na] at org.springframework.integration.http.inbound.HttpRequestHandlingEndpointSupport.actualDoHandleRequest（HttpRequestHandlingEndpointSupport.java:473） [spring-integration-http-4.0.3.RELEASE.jar：na] at org.springframework.integration.http.inbound.HttpRequestHandlingEndpointSupport.doHandleRequest（HttpRequestHandlingEndpointSupport.java:370） [spring-integration-http-4.0.3.RELEASE.jar：na] at org.springframework.integration.http.inbound.HttpRequestHandlingMessagingGateway.handleRequest（HttpRequestHandlingMessagingGateway.java:101） [spring-integration-http-4.0.3.RELEASE.jar：na] at org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter.handle（HttpRequestHandlerAdapter.java:51） [spring-webmvc-4.0.6.RELEASE.jar：4.0.6.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:938） [spring-webmvc-4.0.6.RELEASE.jar：4.0.6.RELEASE]引起： java.lang.IllegalArgumentException：无法解析＆＃39; json__TypeId __＆＃39; in＆＃39; javaTypes＆＃39;。在 org.springframework.integration.support.json.AbstractJacksonJsonObjectMapper.createJavaType（AbstractJacksonJsonObjectMapper.java:67）〜[spring-integration-core-4.0.3.RELEASE.jar：na] at org.springframework.integration.support.json.Jackson2JsonObjectMapper.extractJavaType（Jackson2JsonObjectMapper.java:119）〜[spring-integration-core-4.0.3.RELEASE.jar：na] at org.springframework.integration.support.json.Jackson2JsonObjectMapper.extractJavaType（Jackson2JsonObjectMapper.java:44）〜[spring-integration-core-4.0.3.RELEASE.jar：na] at org.springframework.integration.support.json.AbstractJacksonJsonObjectMapper.fromJson（AbstractJacksonJsonObjectMapper.java:60）〜[spring-integration-core-4.0.3.RELEASE.jar：na] at org.springframework.integration.json.JsonToObjectTransformer.doTransform（JsonToObjectTransformer.java:81）〜[spring-integration-core-4.0.3.RELEASE.jar：na] at org.springframework.integration.transformer.AbstractTransformer.transform（AbstractTransformer.java:33）〜[spring-integration-core-4.0.3.RELEASE.jar：na] ... 102个常见帧省略

当我调试时，我在客户端看到json__TypeId__标头已从传出消息中删除。当我将JsonHeaders.HEADERS添加到DefaultHttpHeaderMapper并使用此映射器注入网关时，我看到当映射器工作完成时，Json标头存在，但是当我最终返回{{1}时} RestTemplate.doWithRequest不再包含Json。当然，我得到了相同的异常服务器端。

也许我的配置不正确，但是当该标题被剥离时，我不确定服务器端如何能够进行requestHeaders转换。

我不希望明确指出特定Mappers上的类型，因为它们可能会有所不同。有没有办法配置支持这条路径所需的组件？

- 参考文献 -

（1）http://docs.spring.io/spring-integration/reference/html/messaging-transformation-chapter.html#transformer滚动到Json Transformers小节

Answer 1

使用出站http适配器，用户标头（在他的情况下是json类型信息）通过HTTP传送为X-<header> ...

<int-http:outbound-gateway request-channel="requestChannel" 
                           url="http://localhost:18080/http/receiveGateway"
                           http-method="POST"
                           mapped-request-headers="foo"
                           expected-response-type="java.lang.String"/>

POST /http/receiveGateway HTTP/1.1
Accept: text/plain, */*
X-foo: bar

在服务器端，X-未被移除，因此您必须将其映射为x ...

<int-http:inbound-gateway request-channel="receiveChannel"
                      path="/receiveGateway"
                      mapped-request-headers="x-foo"
                      supported-methods="POST"/>

然后，您需要在变换器<header-enricher/>之前<chain/>设置标题（减去'x - '）......

<int:header-enricher>
    <int:header name="json__TypeId__" expression="headers['x-json__TypeId__']" />
    ...
</int:header-enricher>

（注意小写x）。

编辑：

或者，在发送方，您可以将映射器配置为不为自定义标头添加前缀...

<bean id="mapper" class="org.springframework.integration.http.support.DefaultHttpHeaderMapper">
    <property name="outboundHeaderNames" value="foo,bar" />
    <property name="userDefinedHeaderPrefix" value="" />
</bean>

Http网关和Json变形金刚：剥离的标题

1 个答案: