Printing the Resulting Document

<< Assembling the XML Signature | 8. Securing Web Services >>

230

AVA

XML D

IGITAL

IGNATURE

API

Notice that we haven't actually generated the signature yet; we'll do that in the
next step.

Generating the XML Signature

Now we are ready to generate the signature, which we do by invoking the

sign

method on the

XMLSignature

object, and pass it the signing context as follows:

signature.sign(dsc);

The resulting document now contains a signature, which has been inserted as the
last child element of the root element.

Printing or Displaying the Resulting Document

You can use the following code to print the resulting signed document to a file or
standard output:

OutputStream os;
if (args.length > 1) {

os = new FileOutputStream(args[1]);

} else {

os = System.out;

}

TransformerFactory tf = TransformerFactory.newInstance();
Transformer trans = tf.newTransformer();
trans.transform(new DOMSource(doc), new StreamResult(os));