WSO2 Payload Factory 保留来自 xml 响应的标签

Question

在我的代理中，我调用了一个远程休息服务，它用这样的消息回复我：

<omim version="1.0">
<entryList>
  <entry>
    <prefix>#</prefix>
    <mimNumber>230900</mimNumber>
    <status>live</status>
    <titles>
        <preferredTitle>GAUCHER DISEASE, TYPE II</preferredTitle>
        <alternativeTitles>GD II;;</alternativeTitles>
     </titles>
     <clinicalSynopsis>
         <inheritance>Autosomal recessive</inheritance>
         <growthWeight>Poor weight gain </growthWeight>
          <growthOther>Failure to thrive </growthOther>
          <headAndNeckEyes>Convergent squint</headAndNeckEyes>
          <headAndNeckMouth>Trismus </headAndNeckMouth>
          <respiratory>Apnea</respiratory>
          <respiratoryLarynx>Laryngeal spasms</respiratoryLarynx>
          <respiratoryLung>Recurrent aspiration pneumonia</respiratoryLung>
          <abdomenExternalFeatures>Protruberantabdomen</abdomenExternalFeatures>
          <abdomenLiver>Hepatomegaly</abdomenLiver>
          <abdomenSpleen>Splenomegaly</abdomenSpleen>
          <abdomenGastrointestinal>Dysphagia </abdomenGastrointestinal>
          <neurologicCentralNervousSystem>Progressive neurologic deterioration</neurologicCentralNervousSystem>
          <hematology>Thrombocytopenia</hematology>
          <laboratoryAbnormalities>Decreased acid beta galactosidase protein and activity</laboratoryAbnormalities>
          <miscellaneous>Onset between 3 and 6 months of age</miscellaneous>
          <molecularBasis>Caused by mutation in the acid beta-glucosidase gene</molecularBasis>
     </clinicalSynopsis>
    </entry>
  </entryList>
</omim>

我需要从这条消息中过滤一些数据并构建一个具有这种结构的自定义消息：

<clinicalManifestation>
    <nonNeurological>
         $1
    </nonNeurological>
</clinicalManifestation>

在哪里 $1，也许使用有效载荷工厂？应该填充一些从上一个响应消息中提取的叶子，例如：

<clinicalManifestation>
    <nonNeurological>
         <growthWeight>Poor weight gain </growthWeight>
          <growthOther>Failure to thrive </growthOther>
          <headAndNeckEyes>Convergent squint</headAndNeckEyes>
          <headAndNeckMouth>Trismus </headAndNeckMouth>
          <respiratory>Apnea</respiratory>
          <respiratoryLarynx>Laryngeal spasms</respiratoryLarynx>
          <respiratoryLung>Recurrent aspiration pneumonia</respiratoryLung>
          <abdomenExternalFeatures>Protruberantabdomen</abdomenExternalFeatures>
          <abdomenLiver>Hepatomegaly</abdomenLiver>
          <abdomenSpleen>Splenomegaly</abdomenSpleen>
          <abdomenGastrointestinal>Dysphagia </abdomenGastrointestinal>
    </nonNeurological>
</clinicalManifestation>

我必须使用 arqs 声明中的特定 xpath 表达式来使用有效负载工厂（什么表达式？）。还是我必须使用其他调解员？哪一个？请给我和例子好吗？

Answer 1

您需要将它们指定为参数。让我从原始的documentation 中提取一个代码作为示例。这里的表达式表示 xpath 表达式。

<payloadFactory>
      <format>
           <m:checkpriceresponse xmlns:m="http://services.samples/xsd">
               <m:code>$1</m:code>
               <m:price>$2</m:price>
           </m:checkpriceresponse>
      </format>
      <args>
           <arg expression="//m0:symbol" xmlns:m0="http://services.samples/xsd">
           <arg expression="//m0:last" xmlns:m0="http://services.samples/xsd">
      </arg></arg></args>
</payloadFactory>

Answer 2

首先，在你的 outSequence 中（在你得到响应之后），你需要从响应中提取 xml 标签/字段，并将它们存储在属性中，以便我们以后可以使用它们......

例如（使用 xpath）：

<property name="growthWeight" expression="//omin/entryList/entry/clinincalSynopsis/growthWeight/text()" scope="default" type="STRING" />
<property name="growthOth" expression="//omin/entryList/entry/clinincalSynopsis/growthOther/text()" scope="default" type="STRING" /> 

等，如果 xpath 不起作用，请参阅（请参阅 http://www.w3schools.com/xpath/xpath_syntax.asp）

您可以将这些属性打印到日志中以查看它们是否设置正确：

<log level="custom">
     <property xmlns:ns="http://org.apache.synapse/xsd" name="Extracted:  Growth weight= " expression="$ctx:growthWeight"/>
     <property xmlns:ns="http://org.apache.synapse/xsd" name="Extracted:  Growth other= " expression="$ctx:growthOth"/>
</log>

然后在你的payload工厂中，你可以将这些属性设置为你最终响应客户端的参数：

<payloadFactory media-type="xml">
    <format>
        <clinicalManifestation>
            <nonNeurological>
                <growthWeight>$1</growthWeight>
                <growthOther>$2</growthOther>
                    :
                    :
                    :
            </nonNeurological>
        </clinicalManifestation>
    </format>
    <args>
        <arg evaluator="xml"  expression="$ctx:growthWeight" />
        <arg evaluator="xml"  expression="$ctx:growthOth" />
                    :
                    :
                    :
    </args>
</payloadFactory>

Answer 3

感谢大家。 我找到了使用 xslt 调解器的更好方法。我编写了我的 xsl 文件，只需将其添加到我的代理中即可：

<xslt key="myXSL" />

我以更有效的方式处理了 xml...中介为我提供了更大的灵活性。