问题转换。要映射的json文件

Question

我在将简单的JSON消息转换为映射时遇到问题

Example_1.json：

{"toAddress":"[e-mail]",
"fromAddress":"[e-mail]",
"subject":"Subject from JSON",
"body":"Body from JSON"}

Spring配置：

<!-- Read file and output to filesIn channel -->
<int:channel id="filesIn" />
<int-file:inbound-channel-adapter id="filesReader"
                                  directory="file:/C:/data/inputDirectory"
                                  filename-pattern="*.json"
                                  channel="filesIn"
                                  prevent-duplicates="true">
    <int:poller id="poller" fixed-delay="5000" max-messages-per-poll="1" />
</int-file:inbound-channel-adapter> 

<file:file-to-string-transformer input-channel="filesIn" output-channel="strings"/>

<int:json-to-object-transformer input-channel="strings" output-channel="objectsOut" type="java.util.Map"/>

<int:object-to-map-transformer input-channel="objectsOut" output-channel="mapOut"/>

<int-file:outbound-channel-adapter channel="mapOut" directory="file:/C:/data/outputDirectory1" />


<!-- Activate logging -->

<int:channel id="filesIn">
    <int:interceptors>
        <int:wire-tap channel="LoggingChannel" />
    </int:interceptors>
</int:channel>

<int:channel id="strings">
    <int:interceptors>
        <int:wire-tap channel="LoggingChannel" />
    </int:interceptors>
</int:channel>

<int:channel id="objectsOut">
    <int:interceptors>
        <int:wire-tap channel="LoggingChannel" />
    </int:interceptors>
</int:channel>

<int:channel id="mapOut">
    <int:interceptors>
        <int:wire-tap channel="LoggingChannel" />
    </int:interceptors>
</int:channel>

<int:channel id="LoggingChannel" />
<int:service-activator input-channel="LoggingChannel" expression="@LOG.trace('Headers are: {}, Payload is: {} ', headers, payload)" />

<bean id="LOG" class="SafeLoggerFactory" factory-method="getLogger">
    <constructor-arg value="integrationEmailLogger"/>
</bean>

错误：

org.springframework.integration.handler.LoggingHandler]-org.springframework.messaging.MessageHandling异常：未能将消息有效载荷写入文件；嵌套异常是java.lang.IllegalArgumentExcture：不支持的消息有效载荷类型[java.util.HashMap]，故障消息=GenericMessage[有效载荷={subject=从JSON的主题，from m地址=[e-mail]，body=从JSON的正文，到地址=[e-mail]}，标头={file_originalFile=C：\data\inputDirectory\Example_1.json，id=be65b982-ef47-0207-2ec9-3fdb04837651，file_name=Example_1.json，时间戳=1575407244281}]

本质上，我想将JSON文本转换成一个映射，这样我就可以使用诸如payload之类的表达式。toAddress使用出站通道适配器发送电子邮件

Answer 1

您应该始终包括完整的堆栈跟踪；截断的堆栈跟踪是无用的。

为什么你有一个对象到映射转换器？json到对象转换器已经为您创建了一个映射；o-t-m-t是多余的。

文件int file:outbound channel adapter不知道如何处理映射负载。这就是失败的地方。