在JAXB中控制名称空间前缀

Wil*_*rce 8 java xml jaxb xml-namespaces

jaxb如何确定编组对象的命名空间前缀声明列表?我使用xjc为ebics(ebics schema)编译java类.当我为ebicsRequest创建一个实例时,它看起来像这样:


<?xml version="1.0" encoding="UTF-16"?>
<ns2:ebicsRequest xmlns:ns2="http://www.ebics.org/H003" Revision="1" Version="H003" xmlns="http://www.ebics.org/H003" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:ns4="http://www.ebics.org/S001" xmlns:ns5="http://www.ebics.org/H000">
    <ns2:header authenticate="true">
        <ns2:static>
            <ns2:HostID>SIZBN001</ns2:HostID>
            <ns2:Nonce>A5488F43223063171CA0FA59ADC635F0</ns2:Nonce>
            <ns2:Timestamp>2009-08-04T08:41:56.967Z</ns2:Timestamp>
            <ns2:PartnerID>EBICS</ns2:PartnerID>
            <ns2:UserID>EBIX</ns2:UserID>
            <ns2:Product Language="de">EBICS-Kernel V2.0.4, SIZ/PPI</ns2:Product>
            <ns2:OrderDetails>
                <ns2:OrderType>FTB</ns2:OrderType>
                <ns2:OrderID>A037</ns2:OrderID>
                <ns2:OrderAttribute>OZHNN</ns2:OrderAttribute>
                <ns2:StandardOrderParams/>
            </ns2:OrderDetails>
            <ns2:BankPubKeyDigests>
                <ns2:Authentication Algorithm="RSA" Version="X002">...</ns2:Authentication>
                <ns2:Encryption Algorithm="RSA" Version="E002">...</ns2:Encryption>
            </ns2:BankPubKeyDigests>
            <ns2:SecurityMedium>0000</ns2:SecurityMedium>
            <ns2:NumSegments>1</ns2:NumSegments>
        </ns2:static>
        <ns2:mutable>
            <ns2:TransactionPhase>Initialisation</ns2:TransactionPhase>
        </ns2:mutable>
    </ns2:header>
    <ns2:AuthSignature>
        <ds:SignedInfo>
            <ds:CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
            <ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/>
            <ds:Reference URI="#xpointer(//*[@authenticate='true'])">
                <ds:Transforms>
                    <ds:Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
                </ds:Transforms>
                <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
                <ds:DigestValue>CSbjPbiNcFqSl6lCI1weK5x1nMeCH5bTQq5pedq5uI0=</ds:DigestValue>
            </ds:Reference>
        </ds:SignedInfo>
        <ds:SignatureValue>...</ds:SignatureValue>
    </ns2:AuthSignature>
    <ns2:body>
        <ns2:DataTransfer>
            <ns2:DataEncryptionInfo authenticate="true">
                <ns2:EncryptionPubKeyDigest Algorithm="http://www.w3.org/2001/04/xmlenc#sha256" Version="E002">dFAYe281vj9NB7w+VoWIdfHnjY9hNbZLbHsDOu76QAE=</ns2:EncryptionPubKeyDigest>
                <ns2:TransactionKey>...</ns2:TransactionKey>
            </ns2:DataEncryptionInfo>
            <ns2:SignatureData authenticate="true">...</ns2:SignatureData>
        </ns2:DataTransfer>
    </ns2:body>
</ns2:ebicsRequest>
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我使用自定义NamespacePrefixMapper来声明ds和xsi的默认命名空间和前缀.对于命名空间ds,它可以正常工作.但对于默认命名空间,它没有.它被声明两次一次为ns2,一次为""后者来自我的自定义NamespacePrefixMapper.getPreDeclaredNamespaceUris.我和这堂课玩过很多次.我也尝试使用package-info.java但我无法将jaxb "http://www.ebics.org/H003"用作默认命名空间.我还不明白的是ns4和ns5的外观,它们不是xml文档的全部内容.

我的NamespacePrefixMapper类看起来像


public class NamespacePrefixMapperImpl extends NamespacePrefixMapper implements NamespaceContext {
    private static final String[] EMPTY_STRING = new String[0];

    private Map prefixToUri = null;
    private Map uriToPrefix = null;

    private void init(){
    prefixToUri = new HashMap();

    prefixToUri.put("", "http://www.ebics.org/H003" );
    prefixToUri.put("ds", "http://www.w3.org/2000/09/xmldsig#" );
    prefixToUri.put("xsi", "http://www.w3.org/2001/XMLSchema-instance" );
    prefixToUri.put(XMLConstants.XML_NS_PREFIX, XMLConstants.XML_NS_URI  );
    prefixToUri.put(XMLConstants.XMLNS_ATTRIBUTE , XMLConstants.XMLNS_ATTRIBUTE_NS_URI );

    uriToPrefix = new HashMap();
    for(String prefix : prefixToUri.keySet()){
        uriToPrefix.put(prefixToUri.get(prefix), prefix);
    }
    }

    @Override
    public String getPreferredPrefix(String namespaceUri, String suggestion, boolean requirePrefix) {
        if (uriToPrefix == null)
        init();

        if (uriToPrefix.containsKey(namespaceUri)){
            return uriToPrefix.get(namespaceUri);
        }

        return suggestion;
    }

    @Override
    public String[] getContextualNamespaceDecls() {
    // TODO Auto-generated method stub
    return EMPTY_STRING;
    }

    @Override
    public String[] getPreDeclaredNamespaceUris() {
    // TODO Auto-generated method stub
    return EMPTY_STRING;

    }

    @Override
    public String[] getPreDeclaredNamespaceUris2() {
    return new String [] {"", prefixToUri.get("")};

    }

    public String getNamespaceURI(String prefix) {
    if (prefixToUri == null)
            init();

    if (prefixToUri.containsKey(prefix)) {
        return prefixToUri.get(prefix);
    } else {
        return XMLConstants.NULL_NS_URI;
    }
    }

    public String getPrefix(String namespaceURI) {
    if (uriToPrefix == null)
            init();

        if (uriToPrefix.containsKey(namespaceURI)){
        return uriToPrefix.get(namespaceURI);
    } else {
        return null;
    }
    }

    public Iterator getPrefixes(String namespaceURI) {
    if (uriToPrefix == null)
            init();

    List prefixes = new LinkedList();

    if (uriToPrefix.containsKey(namespaceURI)){
        prefixes.add(uriToPrefix.get(namespaceURI));
    }
    return prefixes.iterator();
    }


}

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我在用


Manifest-Version: 1.0
Ant-Version: Apache Ant 1.6.5
Created-By: 1.5.0-b64 (Sun Microsystems Inc.)
Specification-Title: Java Architecture for XML Binding
Specification-Version: 2.0
Specification-Vendor: Sun Microsystems, Inc.
Implementation-Title: JAXB Reference Implementation 
Implementation-Version: 2.0.2
Implementation-Vendor: Sun Microsystems, Inc.
Implementation-Vendor-Id: com.sun
Extension-Name: com.sun.xml.bind
Build-Id: b01
Class-Path: jaxb-api.jar activation.jar jsr173_1.0_api.jar jaxb1-impl.
 jar

Name: com.sun.xml.bind.v2.runtime
Implementation-Version: 2.0.2-b01-fcs
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Reb*_*oot 8

出于性能原因,JAXB始终将JAXBContext已知的所有命名空间添加到XML文档的根元素.有关更多信息,请参阅Kohsuke在JAXB-103上发表的评论.

我发现处理此问题的唯一方法是在使用JAXB创建文档后自行遍历文档,并使用以下帮助程序类删除所有未使用的名称空间:

public class RemoveUnusedNamespaces {

    private static final String XML_NAMESPACE_SCHEMA_INSTANCE = "http://www.w3.org/2001/XMLSchema-instance";

    private static final String XML_NAMESPACE_NAMESPACE = "http://www.w3.org/2000/xmlns/";

    private interface ElementVisitor {

        void visit(Element element);

    }

    public void process(Document document) {
        final Set<String> namespaces = new HashSet<String>();

        Element element = document.getDocumentElement();
        traverse(element, new ElementVisitor() {

            public void visit(Element element) {
                String namespace = element.getNamespaceURI();
                if (namespace == null)
                    namespace = "";
                namespaces.add(namespace);
                NamedNodeMap attributes = element.getAttributes();
                for (int i = 0; i < attributes.getLength(); i++) {
                    Node node = attributes.item(i);
                    if (XML_NAMESPACE_NAMESPACE.equals(node.getNamespaceURI()))
                        continue;
                    String prefix;
                    if (XML_NAMESPACE_SCHEMA_INSTANCE.equals(node.getNamespaceURI())) {
                        if ("type".equals(node.getLocalName())) {
                            String value = node.getNodeValue();
                            if (value.contains(":"))
                                prefix = value.substring(0, value.indexOf(":"));
                            else
                                prefix = null;
                        } else {
                            continue;
                        }
                    } else {
                        prefix = node.getPrefix();
                    }
                    namespace = element.lookupNamespaceURI(prefix);
                    if (namespace == null)
                        namespace = "";
                    namespaces.add(namespace);
                }
            }

        });
        traverse(element, new ElementVisitor() {

            public void visit(Element element) {
                Set<String> removeLocalNames = new HashSet<String>();
                NamedNodeMap attributes = element.getAttributes();
                for (int i = 0; i < attributes.getLength(); i++) {
                    Node node = attributes.item(i);
                    if (!XML_NAMESPACE_NAMESPACE.equals(node.getNamespaceURI()))
                        continue;
                    if (namespaces.contains(node.getNodeValue()))
                        continue;
                    removeLocalNames.add(node.getLocalName());
                }
                for (String localName : removeLocalNames)
                    element.removeAttributeNS(XML_NAMESPACE_NAMESPACE, localName);
            }

        });
    }

    private final void traverse(Element element, ElementVisitor visitor) {
        visitor.visit(element);
        NodeList children = element.getChildNodes();
        for (int i = 0; i < children.getLength(); i++) {
            Node node = children.item(i);
            if (node.getNodeType() != Node.ELEMENT_NODE)
                continue;
            traverse((Element) node, visitor);
        }
    }

}
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bdo*_*han 2

EclipseLink JAXB (MOXy)使用 @XmlSchema 注释中指定的前缀(我是 MOXy 负责人)。查看我对类似问题的回答作为示例:

  • 是的,我使用了 NamespacePrefixMappiner (参见上面的代码)。我现在发现我的问题与 xjc 生成 java 代码有关,该代码错误地生成了属性名称空间设置为“”的注释。这迫使 jaxb 使用“”作为默认命名空间,覆盖任何自定义设置。我不知道为什么会发生这种情况,但手动更改代码后一切正常。 (2认同)