JAXB Fragment Marshal w/o namespace

问题:

I'm using the JAXB_FRAGMENT property for my marshaller to marshal at the WorkSet level. The problem is that when I marshal it's giving the WorkSet element the xmlns attribute everytime. Is there a way to marshal so that it doesn't attach the xmlns attribute? Here's what my XML looks like.

    <Import>
        <WorkSets>
            <WorkSet xmlns="http://www.namespace.com">
                <Work>
                <Work>
                ...
                ..
                ...
            </WorkSet>
            <WorkSet xmlns="http://www.namespace.com">
                <Work>
                <Work>
                ...
            </WorkSet>
        </WorkSets>
    </Import>

Here's the code I'm using the create the above:

FileOutputStream fos = new FileOutputStream("import.xml");
XMLStreamWriter writer = XMLOutputFactory.newFactory().createXMLStreamWriter(fos);

JAXBContext jc = JAXBContext.newInstance(WorkSet.class);
Marshaller m = jc.createMarshaler();
m.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);

writer.writeStartDocument();
writer.writeStartElement("Import");
writer.writeAttribute("xmlns","http://www.namespace.com");
writer.writeStartElement("WorkSets");

while(hasWorkSet){
m.marshal(workSet, writer)
}
writer.writeEndDocument();
writer.close();

回答1:

Assuming you want the default namespace for your document to be http://www.namespace.com, you could do the following:

Demo

The XMLStreamWriter.setDefaultNamespace(String) and XMLStreamWriter.writeNamespace(String, String) methods will be used to set and write the default namespace for the XML document.

package forum9297872;

import javax.xml.bind.*;
import javax.xml.stream.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        XMLStreamWriter writer = XMLOutputFactory.newFactory().createXMLStreamWriter(System.out);
        writer.setDefaultNamespace("http://www.namespace.com");

        JAXBContext jc = JAXBContext.newInstance(WorkSet.class);
        Marshaller m = jc.createMarshaller();
        m.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);

        writer.writeStartDocument();
        writer.writeStartElement("http://www.namespace.com", "Import");
        writer.writeNamespace("", "http://www.namespace.com");
        writer.writeStartElement("WorkSets");

        m.marshal(new WorkSet(), writer);
        m.marshal(new WorkSet(), writer);

        writer.writeEndDocument();
        writer.close();
    }

}

WorkSet

My assumption is that you have specified namespace information in your JAXB model.

package forum9297872;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name="WorkSet", namespace="http://www.namespace.com")
public class WorkSet {

}

Output

Below is the output from running the demo code:

<?xml version="1.0" ?><Import xmlns="http://www.namespace.com"><WorkSets><WorkSet></WorkSet><WorkSet></WorkSet></WorkSets></Import>

回答2:

There are three workarounds for this.

1) Create JAXB annotated objects for the container of your workersets. Add the workersets to that object and then marshal the whole thing.

2) Follow the first example in 101 ways to marshal objects with JAXB and use DocumentBuilderFactory with namespace aware.

3) Assuming that the jaxb object is in a package that should never have qualified namespaces you can add the following to the package annotation: (note: it's been a while since i've done this and I havn't tested this code)

@XmlSchema(namespace = "", elementFormDefault = XmlNsForm.UNQUALIFIED) 
package example;

回答3:

Just another example:

    try {
        JAXBContext customerInformationRequestContext = JAXBContext.newInstance(CustomerInformationRequest.class);
        Unmarshaller unmarshaller = customerInformationRequestContext.createUnmarshaller();
        StringReader stringReader = new StringReader(requestPayload);
        XMLInputFactory xif = XMLInputFactory.newFactory();
        XMLStreamReader xsr = xif.createXMLStreamReader(stringReader);
        XMLStreamReaderWrapper reader = new XMLStreamReaderWrapper(xsr);
        CustomerInformationRequest customerInformationRequest = (CustomerInformationRequest) unmarshaller.unmarshal(reader);
        CustomerInformationResponse customerInformationResponse = customerLookup(customerInformationRequest, sessionTransaction);
        JAXBContext customerInformationResponseContext = JAXBContext.newInstance(CustomerInformationResponse.class);
        Marshaller marshaller = customerInformationResponseContext.createMarshaller();
        StringWriter stringWriter = new StringWriter();
        XMLOutputFactory xof = XMLOutputFactory.newFactory();
        XMLStreamWriter xsw = xof.createXMLStreamWriter(stringWriter);
        xsw = new XMLStreamWriterWrapper(xsw);
        marshaller.marshal(customerInformationResponse, xsw);
        String responsePayload = stringWriter.toString();
        return responsePayload;
    } catch (Exception e) {
        log.debug("The payload could not be unmarshalled.", e);
        return null;
    }