如何获得Axis 1.4而不为同一XML名称空间生成多个前缀?

时间:2020-03-05 18:53:21  来源:igfitidea点击:

我正在从使用Axis 1.4库的客户端接收SOAP请求。请求具有以下形式:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" 
                  xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
                  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <soapenv:Body>
    <PlaceOrderRequest xmlns="http://example.com/schema/order/request">
      <order>
        <ns1:requestParameter xmlns:ns1="http://example.com/schema/common/request">
          <ns1:orderingSystemWithDomain>
            <ns1:orderingSystem>Internet</ns1:orderingSystem>
            <ns1:domainSign>2</ns1:domainSign>
          </ns1:orderingSystemWithDomain>
        </ns1:requestParameter>
        <ns2:directDeliveryAddress ns2:addressType="0" ns2:index="1" 
                                   xmlns:ns2="http://example.com/schema/order/request">
          <ns3:address xmlns:ns3="http://example.com/schema/common/request">
            <ns4:zipcode xmlns:ns4="http://example.com/schema/common">12345</ns4:zipcode>
            <ns5:city xmlns:ns5="http://example.com/schema/common">City</ns5:city>
            <ns6:street xmlns:ns6="http://example.com/schema/common">Street</ns6:street>
            <ns7:houseNum xmlns:ns7="http://example.com/schema/common">1</ns7:houseNum>
            <ns8:country xmlns:ns8="http://example.com/schema/common">XX</ns8:country>
          </ns3:address>
[...]

如我们所见,为同一名称空间定义了多个前缀,例如名称空间http://example.com/schema/common具有前缀ns4,ns5,ns6,ns7和ns8. 一些长请求为同一名称空间定义了数百个前缀。

这导致Saxon XSLT处理器出现问题,我使用它来转换请求。 Saxon将同一名称空间的不同前缀的数量限制为255,并且在定义更多前缀时引发异常。

可以将Axis 1.4配置为定义更智能的前缀,以便每个命名空间只有一个前缀吗?

解决方案

回答

我有同样的问题。目前,我通过编写BasicHandler扩展解决了该问题,然后亲自遍历SOAPPart并将名称空间引用移至父节点。我不喜欢这种解决方案,但它确实有效。

我真的希望有人能告诉我们我们该怎么做。

编辑

这太复杂了,就像我说的,我一点都不喜欢它,但是我们开始吧。我实际上将功能分为几个类(这不是我们在该项目中需要做的唯一操作,因此还有其他实现),我真的希望有人可以尽快解决此问题。这使用dom4j来处理通过SOAP流程传递的XML,因此我们需要dom4j才能使其正常工作。

public class XMLManipulationHandler extends BasicHandler {
private static Log log = LogFactory.getLog(XMLManipulationHandler.class);
private static List processingHandlers;

public static void setProcessingHandlers(List handlers) {
    processingHandlers = handlers;
}

protected Document process(Document doc) {
    if (processingHandlers == null) {
        processingHandlers = new ArrayList();
        processingHandlers.add(new EmptyProcessingHandler());
    }
    log.trace(processingHandlers);
    treeWalk(doc.getRootElement());
    return doc;
}

protected void treeWalk(Element element) {
    for (int i = 0, size = element.nodeCount(); i < size; i++) {
        Node node = element.node(i);
        for (int handlerIndex = 0; handlerIndex < processingHandlers.size(); handlerIndex++) {
            ProcessingHandler handler = (ProcessingHandler) processingHandlers.get(handlerIndex);
            handler.process(node);
        }
        if (node instanceof Element) {
            treeWalk((Element) node);
        }
    }
}

public void invoke(MessageContext context) throws AxisFault {
    if (!context.getPastPivot()) {
        SOAPMessage message = context.getMessage();
        SOAPPart soapPart = message.getSOAPPart();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        try {
            message.writeTo(baos);
            baos.flush();
            baos.close();

            ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
            SAXReader saxReader = new SAXReader();
            Document doc = saxReader.read(bais);
            doc = process(doc);
            DocumentSource ds = new DocumentSource(doc);
            soapPart.setContent(ds);
            message.saveChanges();
        } catch (Exception e) {
            throw new AxisFault("Error Caught processing document in XMLManipulationHandler", e);
        }
    }
}

}

public interface ProcessingHandler {
    public Node process(Node node);
}

public class NamespaceRemovalHandler implements ProcessingHandler {
private static Log log = LogFactory.getLog(NamespaceRemovalHandler.class);
private Namespace namespace;
private String targetElement;
private Set ignoreElements;

public NamespaceRemovalHandler() {
    ignoreElements = new HashSet();
}

public Node process(Node node) {
    if (node instanceof Element) {
        Element element = (Element) node;
        if (element.isRootElement()) {
            // Evidently, we never actually see the root node when we're called from
            // SOAP...
        } else {
            if (element.getName().equals(targetElement)) {
                log.trace("Found the target Element.  Adding requested namespace");
                Namespace already = element.getNamespaceForURI(namespace.getURI());
                if (already == null) {
                    element.add(namespace);
                }
            } else if (!ignoreElements.contains(element.getName())) {
                Namespace target = element.getNamespaceForURI(namespace.getURI());
                if (target != null) {
                    element.remove(target);
                    element.setQName(new QName(element.getName(), namespace));
                }
            }
            Attribute type = element.attribute("type");
            if (type != null) {
                log.trace("Replacing type information: " + type.getText());
                String typeText = type.getText();
                typeText = typeText.replaceAll("ns[0-9]+", namespace.getPrefix());
                type.setText(typeText);
            }
        }
    }

    return node;
}

public Namespace getNamespace() {
    return namespace;
}

public void setNamespace(Namespace namespace) {
    this.namespace = namespace;
}

/**
 * @return the targetElement
 */
public String getTargetElement() {
    return targetElement;
}

/**
 * @param targetElement the targetElement to set
 */
public void setTargetElement(String targetElement) {
    this.targetElement = targetElement;
}

/**
 * @return the ignoreElements
 */
public Set getIgnoreElements() {
    return ignoreElements;
}

/**
 * @param ignoreElements the ignoreElements to set
 */
public void setIgnoreElements(Set ignoreElements) {
    this.ignoreElements = ignoreElements;
}

public void addIgnoreElement(String element) {
    this.ignoreElements.add(element);
}
}

没有保修等。

回答

更改客户端的wsdd以将" enableNamespacePrefixOptimization"设置为" true"

<globalConfiguration >
  <parameter name="enableNamespacePrefixOptimization" value="true"/>