How to control iTV GUI from server

I wanna develop iTV like DVB-MHP Ref-Impl at devicetop.com, but I want to control the GUI from server not build the GUI at client. it's like if we build web page database. at client side will request page to server and server send the UI+database to client. but the client side is iTV from devicetop. can I realize this???
what web server that can make it realize??

Well, MHP doesn't explicitly support it, but if you can implement it, then it's allowed. Implementing it is the hard part :)
The rest of this answer assumes that you're not using DVB-HTML (fairly safe, since no available platform that I know of currently supports it). If this isn';t the case, please ignore the rest of this.
Narakrishna, why do you want to build the GUI on the server and not the client? Given the way that MHP is designed to operate (e.g. like writing any other Java code, where the client running the app handles everything), then doing this will get extremely complex. You're assuming that a return channel exists and is always on, which will not be the case for most users. Since most of the existing MHP implementations use PSTN modems for the return channel if they have one, using an application like this could get very expensive for the user. This situation isn't likely to change in the short term.
It could also be more computationally expensive to render a GUI built on the server than to just build the GUI on the client, since the GUI would eventually have to be converted to Java objects to be displayed. It's much easier to simply build the GUI on the client from Java objects int he first place.
One way of doing someting similar (at the expense of object carousel size and application loading time) would be to hold the descriptions of pre-built GUI components in the oject carousel. You can then update these when you need to. There's a couple of downsides to this approach though:
1) the GUI components are the same for every user
2) depending on what you wanted, you'd still need to do some customisation on the client.
3) you need some way of turning the description in to a real Java GUI component. Maybe you could serialise Java objects for your GUI and do it that way, but I'm not sure.
On the whole, I don't think that this is the best approach to building a GUI for MHP apps due to the limitations of the platform.

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         BufferedOutputStream bos=null;
         boolean download=false;
         res.setHeader("Content-disposition", "attachment; filename=upload.html " );
         try{
         URL url=new URL(fileURL);
         URLConnection connection=url.openConnection();
         InputStream in=connection.getInputStream();
         bis=new BufferedInputStream(in);
         FileOutputStream fileout=new FileOutputStream("upload.html");
         bos=new BufferedOutputStream(fileout);
         while(-1 != (bytesRead = bis.read())){
         try{
         bos.write(bytesRead);
         bos.flush();
         }//end of try forwhile loop
         catch(SocketException e){
         setError(e);
         break;
    The code is getting compiled, when I run the appln using the URL,
    http://localhost:8080/upload/servlet/DownloadFile
    it opens a pop up dialog box, asking whether to "open", "save" or "cancel" buttons. When I try to open a file, I'm getting a blank page.
    I'm not getting the contents of the file.
    So pls can anyone tel me wht's wrong in the code or do i need to add few more lines in my code?
    Also pls let me know, how can I download any files of type .doc, html, .txt, .zip, or any type, without mentioning the file type?
    Thanks in advance

    Do not use a FileOutputStream (that will save it locally to the server). Call HttpServletResponse.getOutputStream(), which will send it back to the browser. Also remember to call close() on the stream at the end.
    - Saish

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