The following is a sample Key Generator in JAVA
package RIP;

import java.net.*;
import java.io.*;
import org.w3c.dom.*;
import org.apache.xerces.parsers.*;
import org.apache.xml.serialize.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;

public class KeyGeneratorSample extends javax.servlet.http.HttpServlet {
	
public KeyGeneratorSample() {
	super();
   }

private static final void addElement (org.xml.sax.ContentHandler hd, AttributesImpl attr, String stElement, String stValue) throws org.xml.sax.SAXException {
	hd.startElement ("", "", stElement, attr);
	if ((stValue != null) && (stValue.length () != 0)) {
	 	hd.characters (stValue.toCharArray (), 0, stValue.length ());
		}
  	hd.endElement ("", "", stElement);	
	}

public void doPost (javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res) throws javax.servlet.ServletException {
	try {
		DOMParser parser = new DOMParser ();
		parser.parse (new org.xml.sax.InputSource (req.getInputStream ()));
		Document doc = parser.getDocument ();

		int iKeysNeeded = Integer.parseInt (getFirstTextNodeValueByTagName (doc, "keycount"));

		OutputFormat of = new OutputFormat ("xml","utf-8", true);
		of.setIndent (1);
		of.setIndenting (true);
		XMLSerializer serializer = new XMLSerializer (res.getWriter (), of);

		org.xml.sax.ContentHandler hd = serializer.asContentHandler ();
		AttributesImpl attr = new AttributesImpl ();
		hd.startDocument ();

		hd.startElement ("", "", "response", attr);
		hd.startElement ("", "", "registrationkey", attr);
		for (int i = 0; i < iKeysNeeded; i++) {
			addElement (hd, attr, "keydata", "Remotely generated key #" + Integer.toString (i + 1));
			}
		hd.endElement ("", "", "registrationkey");
		hd.endElement ("", "", "response");
		hd.endDocument ();
		} 
	catch (Exception e) { 
		Logger.logError ("Exception in RIP.KeyGeneratorSample.doPost: " + e);
		}
	}

private static final String getFirstTextNodeValueByTagName (Document doc, String tagName) {
 	NodeList list = doc.getElementsByTagName (tagName);
	if (list.getLength () != 0) {
		return (getTextNodeValue (list.item (0)));
		}
	return (null);
	}

private static final String getTextNodeValue (Node node) {
	NodeList list = node.getChildNodes ();
	for (int i = 0; i < list.getLength (); i++) {
		Node n = list.item (i);
		if (n.getNodeType () == Node.TEXT_NODE) {
			return (n.getNodeValue ());
			}
		}
	return (null);
	}
}