Question

I am trying to make a server-client model in which the server can see what the client is doing on their systems. I want to capture and send an image via a socket (skt). How can I display the image received by the server.

Client Thread:

screenShot = new Robot().createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()));
                    ImageIO.write(screenShot, "PNG", skt.getOutputStream());

Server Thread:

                BufferedImage image = ImageIO.read(connarray.get(0).getInputStream());
                Graphics g = image.getGraphics();
                g.drawImage(image, 500, 500, null);

Answer 1

You don’t ask an actual question here, but I could make a couple of observations.

1. Both your client and server code is catching and squashing exceptions. If any exceptions were thrown by the client or server-side, your code is throwing away all of the evidence. Change

       } catch(Exception ew) { }
   

   to

       } catch(Exception ew) { ew.printStackTrace(); }
   

   If there are exceptions being thrown, this will tell you what they are. (In production code, you should probably log exceptions instead of calling printStackTrace(...) … but that is a lesson for later.)

2. Taking a screenshot every 1/10th of a second is going to generate a lot of load on the client and server side.

3. There are existing (non-Java) tools for doing this kind of thing.