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我是 Mule4 和 Dataweave 2.0 的新手，我很难尝试将 HTTP 请求响应转换为 Base64 值。只需几个步骤，这就是我正在做的事情：

  • 向 API 发送请求并将响应输出为“application/pdf”
  • 将有效负载转换为字符串
  • 将有效负载“编码”为 Base64
  • 将结果添加到数组

以下是之前操作所涉及的 XML：

<foreach doc:name="For Each Documents in FactIntake" doc:id="6ee1729e-0280-41e6-bc29-039ad404d74d" collection="vars.factIntake.documents">
    <set-variable value="#[vars.factIntake.documents[0].documentId]" doc:name="Set documentId" doc:id="c28e1d72-bb82-43af-b340-d91b5cbc428e" variableName="docId"/>
    <http:request method="GET" doc:name="GetDocumentMetadata" doc:id="87006616-e519-4f0f-b5e2-be33c6cf5dae" config-ref="HTTP_Request_DocManagement" path="documents/{documentId}" outputMimeType="application/pdf">
        <http:uri-params><![CDATA[#[output application/java
---
{
    documentId : vars.factIntake.documents[0].documentId
}]]]></http:uri-params>
        <http:response-validator>
            <http:success-status-code-validator values="200, 404"/>
        </http:response-validator>
    </http:request>
    <choice doc:name="Condition" doc:id="76c0dc6f-3d9c-452f-960d-6bd8a0039ebc">
        <when expression="#[attributes.statusCode == 200]">
            <ee:transform doc:name="Transform Message" doc:id="ad2a1dd7-0973-4854-b44c-bdfe8eb54778">
                <ee:message>
                    <ee:set-payload><![CDATA[%dw 2.0
output application/java
---

write(payload, "text/plain")]]></ee:set-payload>
                </ee:message>
                <ee:variables>
                    <ee:set-variable variableName="documentsArray"><![CDATA[%dw 2.0
output application/java
---
vars.documentsArray + vars.document]]></ee:set-variable>
                </ee:variables>
            </ee:transform>
            <ee:transform doc:name="Transform Message" doc:id="9ef64824-ffc1-4a56-b97c-d57cc37800a5">
                <ee:message>
                    <ee:set-payload><![CDATA[%dw 2.0
import * from dw::core::Binaries
output application/java
---
vars.documentsArray + toBase64(payload)]]></ee:set-payload>
                </ee:message>
            </ee:transform>
        </when>
        <otherwise>
            <flow-ref doc:name="Document Not Found Logging" doc:id="0d6b7df4-fde1-4d77-9257-2ffe1e9f5468" name="IntegrationFabricLogsFlow"/>
        </otherwise>
    </choice>
</foreach>

问题？添加到的值为documentsArrayNULL。我在这里缺少什么？我的想法不多了，谷歌/互联网在这个话题上没有帮助。

任何帮助/想法？

4

1 回答 1

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看起来你的有效载荷是一个java对象而不是二进制，所以在转换为base 64之前将它转换为二进制

%dw 2.0
import * from dw::core::Binaries    
var binaryPayload = payload as Binary
output application/java
---
    vars.documentsArray + toBase64(binaryPayload)
于 2019-05-29T02:25:38.260 回答