Example 5.3 Generate and Store Token

<pre>
/**
* Save a new transaction token in the
* user's current session, creating
* a new session if necessary.
*
* @param request The servlet request we are processing
*/
protected void saveToken(HttpServletRequest request) {

HttpSession session = request.getSession();
String token = generateToken(request);
if (token != null)
  session.setAttribute(TRANSACTION_TOKEN_KEY, token);
}

(Copyright (c) 1999 The Apache Software Foundation. All rights 
reserved.)
</pre>