task in any process involving JDOM is to obtain a JDOM
Document object. The
object in JDOM is the core class that represents an XML document.
Like all other objects within the JDOM model, the
org.jdom.Document class is detailed in Appendix A, and all its method signatures are listed. Additionally, complete Javadoc on JDOM is available at http://www.jdom.org.
There are two ways to obtain a JDOM
object: create one from scratch, when no existing XML data must be
read, and build one from existing XML data.
When no existing XML data is needed as
a starting point, creating a JDOM
simply a matter of invoking a constructor:
Document doc = new Document(new Element("root"));
As we mentioned earlier, JDOM is a set of concrete classes, not a set
of interfaces. This means that the more complicated code using
factories to create objects as needed to create an
org.w3c.dom.Element in DOM is unnecessary in JDOM.
We simply perform the
new operation on the
Document object, and we have a viable JDOM
Document that can be used.
Document is not tied to any particular
parser, either. XML often needs to be created from a blank template,
rather than an existing XML data source, so there is a JDOM
org.jdom.Document that requires
only a root
Element as a parameter. Example 8.3 builds an XML document from scratch using
Example 8-3. Building a Document
import org.jdom.Document; import org.jdom.Element; ...