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在 spring 集成 aws 应用程序中，使用 s3-outbound-gateway 将文件从源文件夹路由到目标 S3 存储桶。想使用文件到字符串转换器对文件进行 UTF-8/16 编码并上传到目标存储桶中。但是放置在目标存储桶中的输出文件没有编码，应用程序也不会抛出错误。

这里是否缺少任何东西以及实现此目的的任何其他方式？

 <file:file-to-string-transformer input-channel="fileswithoutencoding" output-channel="filesOutS3Transformer" charset="UTF-8"/>
      <!-- added this line -->
<integration:transformer input-channel="filesOutS3Transformer" output-channel="filesS3GateWay" expression="payload.bytes" />
    <int-aws:s3-outbound-gateway id="s3File"
            request-channel="filesS3GateWay"
            reply-channel="filesS3ChainChannel"
            transfer-manager="transferManager"
            bucket-expression = "headers.TARGET_PATH"
            key-expression="headers.file_name"
            command="UPLOAD">
            <int-aws:request-handler-advice-chain>
                <ref bean="retryAdvice" />
            </int-aws:request-handler-advice-chain>
        </int-aws:s3-outbound-gateway>

路由到本地文件：文件仅使用文件到字符串转换器编码为 UTF-8 格式，尽管字符集是 8/16/32。

<integration:chain id="filesOutChain" input-channel="filesOut">
    <integration:transformer expression="headers.FILE"/>
    <file:file-to-string-transformer charset="UTF-16"/>
<!-- though bytes conversion is not required,just added for testing purpose -->
    <integration:transformer expression="payload.bytes"/>
        <file:outbound-gateway id="fileMover" 
            auto-create-directory="true"
            directory-expression="headers.TARGET_PATH"
            mode="REPLACE">
            <file:request-handler-advice-chain>
                <ref bean="retryAdvice" />
            </file:request-handler-advice-chain>
        </file:outbound-gateway>    
        <integration:gateway request-channel="filesOutChainChannel" error-channel="errorChannel"/>
    </integration:chain>
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