JAXB - Calling marshal
Only a handful of source code lines is required to make a JAXB Marshaller
object write a document tree as an XML file. First you obtain a Marshaller
from a JAXBContext
. Then, you might set a number of properties, such as the one that's used below, which requests nice formatting of the XML text. Other properties concern the inclusion of a schema location as an attribute in the top-level element, or the encoding in the XML prolog. The first argument must be an object that is either a root element, as defined by your schema, or a JAXBElement<?>
.
import java.io.*;
import javax.xml.bind.* void writeDocument( Object document, String pathname )
throws JAXBException, IOException {
Class<T> clazz = document.getValue().getClass();
JAXBContext context = JAXBContext.newInstance( clazz.getPackage().getName() );
Marshaller m = context.createMarshaller();
m.setProperty( Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE );
m.marshal( document, new FileOutputStream( pathname ) );
}
Sometimes marshalling needs to be done not only for one or two root documents but for objects of many different schema types. You could, of course, add xsd:element
definitions for all of them to the top level xsd:schema
element, but this is cumbersome. A generic solution is presented below. The method wraps an arbitrary element of some type T
into a JAXBElement<T>
.
<T> JAXBElement<T> wrap( String ns, String tag, T o ){
QName qtag = new QName( ns, tag );
Class<?> clazz = o.getClass();
@SuppressWarnings( "unchecked" )
JAXBElement<T> jbe = new JAXBElement( qtag, clazz, o );
return jbe;
}
To use it, you must create a context capable of handling all the classes that might crop up as instantiations for T
. (Creating a JAXBContext
for several packages or classes is explained in section The JAXB Context.) With a Marshaller m
obtained from this context, the application of wrap
is as simple as this:
SomeType st = ...;
JAXBElement<SomeType> jbx = wrap( "http://www.acme.com", "someTag", st );
m.marshal( jbx, System.out );
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