如何从根元素中包含所有inscope命名空间的xml中获取节点

Question

这是我的XML文件内容

<Invoice xmlns="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2" xmlns:cac="urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2" 
xmlns:cbc="urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2" xmlns:ds=" http://www.w3.org/2000/09/xmldsig#" xmlns:ext="urn:oasis:names:specification:ubl:schema:xsd:CommonExtensionComponents-2" xmlns:sac="urn:oasis:names:specification:ubl:schema:xsd:SignatureAggregateComponents-2" 
xmlns:sbc="urn:oasis:names:specification:ubl:schema:xsd:SignatureBasicComponents-2" xmlns:sig="urn:oasis:names:specification:ubl:schema:xsd:CommonSignatureComponents-2">
<ext:UBLExtensions>
<ext:UBLExtension>
<ext:ExtensionURI>urn:oasis:names:specification:ubl:dsig:enveloped:xades</ext:ExtensionURI>
<ext:ExtensionContent>
<sig:UBLDocumentSignatures>
<sac:SignatureInformation>
<cbc:ID>urn:oasis:names:specification:ubl:signature:1</cbc:ID>
<sbc:ReferencedSignatureID>urn:oasis:names:specification:ubl:signature:Invoicesadas</sbc:ReferencedSignatureID>
<ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#" Id="signature">
<ds:SignedInfo>
<!-- SOME CONTENT HERE -->
</ds:SignedInfo>
<ds:SignatureValue></ds:SignatureValue>
<ds:KeyInfo>
<ds:X509Data>
<ds:X509Certificate></ds:X509Certificate>
</ds:X509Data>
</ds:KeyInfo>
<ds:Object>
<xades:QualifyingProperties xmlns:xades="http://uri.etsi.org/01903/v1.3.2#" Target="signature">
<xades:SignedProperties Id="xadesSignedProperties">
<xades:SignedSignatureProperties>
<xades:SigningTime>2020-12-25T12:57:51Z</xades:SigningTime>
<xades:SigningCertificate>
<xades:Cert>
<xades:CertDigest>
<ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
<ds:DigestValue> <!-- SOME VALUE HERE --></ds:DigestValue>
</xades:CertDigest>
<xades:IssuerSerial>
<ds:X509IssuerName><!-- SOME VALUE HERE--></ds:X509IssuerName>
<ds:X509SerialNumber><!-- SOME VALUE HERE--></ds:X509SerialNumber>
</xades:IssuerSerial>
</xades:Cert>
</xades:SigningCertificate>
</xades:SignedSignatureProperties>
</xades:SignedProperties>
</xades:QualifyingProperties>
</ds:Object>
</ds:Signature>
</sac:SignatureInformation>
</sig:UBLDocumentSignatures>
</ext:ExtensionContent>
</ext:UBLExtension>
</ext:UBLExtensions>
<!-- SOME CONTENT HERE -->
</Invoice>

我想检索SignedProperties元素和文件中所有作用域内的xmlns命名空间。我需要的样本输出看起来像

<?xml version="1.0" encoding="UTF-8"?> <xades:SignedProperties **xmlns="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2" xmlns:cac="urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2"
xmlns:cbc="urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" 
xmlns:ext="urn:oasis:names:specification:ubl:schema:xsd:CommonExtensionComponents-2" xmlns:sac="urn:oasis:names:specification:ubl:schema:xsd:SignatureAggregateComponents-2" xmlns:sbc="urn:oasis:names:specification:ubl:schema:xsd:SignatureBasicComponents-2" 
xmlns:sig="urn:oasis:names:specification:ubl:schema:xsd:CommonSignatureComponents-2"** xmlns:xades="http://uri.etsi.org/01903/v1.3.2#" Id="xadesSignedProperties">
<xades:SignedSignatureProperties>
<xades:SigningTime>020-12-25T12:57:51Z</xades:SigningTime>
<xades:SigningCertificate>
<xades:Cert>
<xades:CertDigest>
<ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
<ds:DigestValue> <!-- SOME VALUE HERE --></ds:DigestValue>
</xades:CertDigest>
<xades:IssuerSerial>
<ds:X509IssuerName> <!-- SOME VALUE HERE --></ds:X509IssuerName>
<ds:X509SerialNumber> <!-- SOME VALUE HERE --></ds:X509SerialNumber>
</xades:IssuerSerial>
</xades:Cert>
</xades:SigningCertificate>
</xades:SignedSignatureProperties>
</xades:SignedProperties>

但是我得到的输出没有在文件的根元素中定义的名称空间。

我应该如何获得在XML文件的作用域中声明了所有名称空间的元素？

Answer 1

似乎需要对提取的xades:SignedProperties节点应用规范化。您可以尝试使用Apache Santuario库中的Canonicalizer，并将提取的节点规范化：

public static byte[] canonicalizeSubtree(final String canonicalizationMethod, final Node node) {
try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
final Canonicalizer c14n = Canonicalizer.getInstance(getCanonicalizationMethod(canonicalizationMethod));
c14n.canonicalizeSubtree(node, baos);
return baos.toByteArray();
} catch (Exception e) {
// some logic here
}
}

对于规范化方法，它看起来更像是一个"包括"；规范化，例如：；http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments"(请参见ALGO_ID_C14N_WITH_COMMENTS(。