我目前正在研究一个使用CXF框架请求Web服务的项目。
由于某些原因,我开始收到无效的XML SOAP(缺少ID引用了ID的元素)响应,该响应导致在将数据解组到POJO实例期间引发异常。
示例:
XML摘录,其中属性ref
引用XML中不存在的标识符为Person1
的元素。
<ext:Applicant s:ref="Person1"/>
在XSD模式中,ref
是IDREF
类型
<attribute name="ref" type="IDREF"/>
JAXB引发的异常
javax.xml.ws.soap.SOAPFaultException: Unmarshalling Error: Undefined ID "Person1". ] with root cause
javax.xml.bind.UnmarshalException: Undefined ID "Person1".
at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent(UnmarshallingContext.java:744) ~[jaxb-impl-2.3.1.jar!/:2.3.1]
at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallingContext.errorUnresolvedIDREF(UnmarshallingContext.java:795) ~[jaxb-impl-2.3.1.jar!/:2.3.1]
at com.sun.xml.bind.v2.runtime.reflect.TransducedAccessor$IDREFTransducedAccessorImpl$1.run(TransducedAccessor.java:330) ~[jaxb-impl-2.3.1.jar!/:2.3.1]
at...
有没有一种方法可以使JAXB忽略丢失的引用并在不引发异常的情况下解组传入的XML响应?
答案 0 :(得分:1)
请求中未提供XML对象,以进行更具体的讨论。有一个简便的解决方法可以为JAX-B对象创建CustomAdapter
,以确定如何marshal
和unmarshal
对象。
例如,可以实现以下CustomAdapter
:
public static class CustomAdapter extends XmlAdapter<Object, Person1> {
@Override
public Object marshal(Person1 value) {
// your implementation to marshal
}
@Override
public Person1 unmarshal(Object value) {
// your implementation to unmarshal
}
}
XmlAdapter
位于javax.xml.bind.annotation.adapters.XmlAdapter
包中。
如果将Person1
用作其他对象(组成)中的字段,则可以使用@XmlJavaTypeAdapter
对其进行注释,如下所示:
@XmlJavaTypeAdapter(CustomAdapter.class)
private Person1 person1;
请帮助我。
答案 1 :(得分:0)
可能的解决方案可能是为XMLEventReader创建一个装饰器,该装饰器将滤除IDREF属性(或必要时其他属性):
public class IdRefFilteringReader implements XMLEventReader {
/**
* QName of the attribute to be removed
*/
private final static QName QNAME = new QName("http://www.w3.org/2001/XMLSchema", "ref");
/**
* Delegate XML event reader
*/
private final XMLEventReader delegate;
/**
* XML event factory
*/
private final XMLEventFactory eventFactory = XMLEventFactory.newInstance();
/**
* Constructor injects delegate
*/
public IdRefFilteringReader(XMLEventReader delegate) {
this.delegate = delegate;
}
/**
* Remove attributes with matching QName
*/
@Override
public XMLEvent nextEvent() throws XMLStreamException {
XMLEvent event = delegate.nextEvent();
if (event.isStartElement()) {
StartElement startElement = event.asStartElement();
Attribute attr = startElement.getAttributeByName(QNAME);
// if attribute is present, create new XMLEvent with same
// prefix, namespace, name and other attributes except one
// which should be removed
if(attr != null) {
String prefix = startElement.getName().getPrefix();
String uri = startElement.getName().getNamespaceURI();
String localname = startElement.getName().getLocalPart();
List<Attribute> attributes = new ArrayList<>();
startElement.getAttributes().forEachRemaining(a -> {
if(!a.getName().equals(attr.getName())) {
attributes.add(a);
}
});
return eventFactory.createStartElement(
prefix,
uri,
localname,
attributes.iterator(),
startElement.getNamespaces()
);
}
}
return event;
}
@Override
public boolean hasNext() {
return delegate.hasNext();
}
@Override
public XMLEvent peek() throws XMLStreamException {
return delegate.peek();
}
@Override
public String getElementText() throws XMLStreamException {
return delegate.getElementText();
}
@Override
public XMLEvent nextTag() throws XMLStreamException {
return delegate.nextTag();
}
@Override
public Object getProperty(String name) throws IllegalArgumentException {
return delegate.getProperty(name);
}
@Override
public void close() throws XMLStreamException {
delegate.close();
}
@Override
public Object next() {
return delegate.next();
}
}
要使用此阅读器,需要将其传递给解组器实例,例如:
// create unmarshaller
JAXBContext ctx = JAXBContext.newInstance(Applicant.class);
Unmarshaller unmarshaller = ctx.createUnmarshaller();
// create regular XML event reader and filtered XML event reader
XMLInputFactory xif = XMLInputFactory.newInstance();
XMLEventReader reader = xif.createXMLEventReader(new StreamSource(new StringReader(xml)));
XMLEventReader filteringReader = new IdRefFilteringReader(reader);
// unmarshall XML using filtering reader
Applicant applicant = unmarshaller.unmarshal(filteringReader, Applicant.class);