Xml 转换 - 将父属性复制到子属性

Question

我想通过将每个父级 PurchaseHistory 的属性 Type 复制到其子级 StoreTransaction

来转换下面的 xml

输入Xml：

<ArrayOfStoreTransaction CustomerID="C1">
    <PurchaseHistory Type="purchase.001" Count="2">
        <StoreTransaction>
            <CustomerID>C1</CustomerID>
            <CustomerAccount>C1A</CustomerAccount>
        </StoreTransaction>
        <StoreTransaction>
            <CustomerID>C1</CustomerID>
            <CustomerAccount>C1A</CustomerAccount>
        </StoreTransaction>
    </PurchaseHistory>
    <PurchaseHistory Type="purchase.002" Count="1">
        <StoreTransaction>
            <CustomerID>S3</CustomerID>
            <CustomerAccount>S3A</CustomerAccount>
        </StoreTransaction>
    </PurchaseHistory>
    <PurchaseHistory Type="purchase.003" Count="2">
        <StoreTransaction>
            <CustomerID>S3</CustomerID>
            <CustomerAccount>S3A</CustomerAccount>
        </StoreTransaction>
        <StoreTransaction>
            <CustomerID>S3</CustomerID>
            <CustomerAccount>S3A</CustomerAccount>
        </StoreTransaction>
    </PurchaseHistory>
</ArrayOfStoreTransaction>

输出XML：

<ArrayOfStoreTransaction CustomerID="C1">
        <StoreTransaction Type="purchase.001">
            <CustomerID>C1</CustomerID>
            <CustomerAccount>C1A</CustomerAccount>
        </StoreTransaction>
        <StoreTransaction Type="purchase.001">
            <CustomerID>C1</CustomerID>
            <CustomerAccount>C1A</CustomerAccount>
        </StoreTransaction>
        <StoreTransaction Type="purchase.002">
            <CustomerID>S3</CustomerID>
            <CustomerAccount>S3A</CustomerAccount>
        </StoreTransaction>
        <StoreTransaction Type="purchase.003">
            <CustomerID>S3</CustomerID>
            <CustomerAccount>S3A</CustomerAccount>
        </StoreTransaction>
        <StoreTransaction Type="purchase.003">
            <CustomerID>S3</CustomerID>
            <CustomerAccount>S3A</CustomerAccount>
        </StoreTransaction>
</ArrayOfStoreTransaction>

所以我想要一个好的java库来以有效的方式转换我的xml，考虑到内存和执行时间，因为xml将非常大> 200mb

Answer 1

您只需要两个简单的 XSLT 模板规则即可：

<xsl:template match="PurchaseHistory">
  <xsl:apply-templates/>
</xsl:template>
<xsl:template match="StoreTransaction">
  <StoreTransaction Type="{../@Type}">
    <xsl:apply-templates/>
  </StoreTransaction>
</xsl:template>

一个好的现代 XSLT 转换引擎应该能够毫无困难地处理 200Mb。如果它进入千兆字节范围，并且您使用支持 XSLT 3.0 流式传输的引擎，则此转换是完全可流式传输的。

不要浪费时间用 Java 进行编码。