Servlet to Handle Applet Interaction

The applet communicates with a servlet through a URLConnection.  In effect, the servlet functions as a Controller for the applet, performing the usual functions of obtaining user data and an intended action, preparing the data, calling the model, receiving results, etc.  The main difference is that the servlet must read a RequestBean  from the URLConnection and, at the end of theprocess, prepare a ResponseBean to carry results back to the applet and write that bean to the URLConnection.

These functions are illustrated in the code fragments, below.

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Process RequestBean

// get request bean
requestBean = getRequestBean( request );
if ( requestBean == null ) {
	sendError( response, "Error reading Request" );
	return;
}

// get DataBean from RequestBean 
BeanPerson dataBean = (BeanPerson)(requestBean.getDataBean()); 
dataBean.setOwner( loginName );
BeanPerson dataBeanNew;

// get action requested from ReqeustBean
String userAction = ( requestBean.getUserAction() ).trim(); 
int userActionSwitch = UserAction.mapUserAction( userAction );

Get RequestBean

private RequestBean getRequestBean( HttpServletRequest req ) {

	RequestBean requestBean;

	try {

		ServletInputStream is = req.getInputStream();
		ObjectInputStream ois = new ObjectInputStream( is );
		Object object = (ois.readObject());

		requestBean = (RequestBean)object;

		ois.close();

	} catch (IOException e) {
		return null;
	} catch (ClassNotFoundException e) {
		return null;
	}

	return requestBean;

}

Send ResponseBean

private boolean sendResponseBean( HttpServletResponse resp, ResponseBean responesBean ) {

	try {

		ServletOutputStream os = resp.getOutputStream();
		ObjectOutputStream oos = new ObjectOutputStream( os );
		oos.writeObject(responesBean);

		oos.flush();
		oos.close();

	} catch (IOException e) {
		return false;
	} 	

	return true;

}