public String getClipboardImageURL(String server){            
        String url = "";
        try{
            DataFlavor dataFlavor = DataFlavor.imageFlavor;
            if(clipboard.getAvailableDataFlavors()[0].isFlavorJavaFileListType()) {
                dataFlavor = DataFlavor.javaFileListFlavor;
            }
            Object object  = null;
            try{
                object = clipboard.getContents(null).getTransferData(dataFlavor);
            }catch (Exception e){
                JOptionPane.showMessageDialog(null, "No image found.");
                return "Error: No image found.";
            }
            BufferedImage img = null;
            BufferedImage bimg = null;
            if(clipboard.getAvailableDataFlavors()[0].isFlavorJavaFileListType()) {
                List ficheros = (List)object;
                // I get the first of all files, is for don't complicate the example
                img = ImageIO.read(((File)ficheros.get(0)));
            } else {
                if(clipboard.getAvailableDataFlavors()[0].isMimeTypeEqual(DataFlavor.imageFlavor)){
                    img = (BufferedImage) object;
                }
            }
            // if img isn't an image, it will be null
            if(img!=null) {
                int w = img.getWidth(null);
                int h = img.getHeight(null);
                bimg = new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);
                ImageIcon ii = new ImageIcon(img);
                ImageObserver is = ii.getImageObserver();
                bimg.getGraphics().setColor(new Color(255, 255, 255));
                bimg.getGraphics().fillRect(0, 0, w, h);
                bimg.getGraphics().drawImage(ii.getImage(), 0, 0, is);
                ByteArrayOutputStream stream = new ByteArrayOutputStream();
                JPEGImageEncoder jpeg = JPEGCodec.createJPEGEncoder(stream);
                jpeg.encode(bimg);
                URL u = new URL(server+"/upload.php?");
                URLConnection con = u.openConnection();
                String boundary = "-----------------------------7d637a1aa100de";
                con.setRequestProperty("method", "POST");
                con.setRequestProperty("Content-Type", "multipart/form-data; boundary=\""+boundary+"\"");
                con.setDoOutput(true);
                con.getOutputStream().write(((String)
                    "--"+boundary+"\r\n"+
                    "Content-Disposition: form-data; name=\"img\"; filename=\""+filename+"\"\r\n"+
                    "Content-Type: image/jpeg\r\n"+
                    "Content-Transfer-Encoding: base64\r\n\r\n" +
                    Base64.encode(stream.toByteArray()));

                con.connect();
                InputStream inputStream = con.getInputStream();
                byte [] urlBytes = new byte [inputStream.available()];
                inputStream.read(urlBytes);
                url = new String(urlBytes);
                url  = "/getImage?id="+url;
            } 
        } catch (Exception exc){
            if (ShowExceptions.ShowExceptions)
                exc.printStackTrace();
        }
        return url;
    }