shows current Time as realtime gif

timeAsGif.java

   @GET
    @Path("timeAsGif.gif")
    @Produces("image/gif")
    public Response timeAsGif() throws IOException {
        try {
            ByteArrayOutputStream bos = new ByteArrayOutputStream(255);
            ImageOutputStream output = ImageIO.createImageOutputStream(bos);

            GifSequenceWriter writer = new GifSequenceWriter(output, BufferedImage.TYPE_BYTE_INDEXED, (int) TimeUnit.MINUTES.toMillis(1), false);

            Font f = new Font("sans-serif", Font.BOLD, 50);
            Color brass = Color.decode("#B5A642");

            long cur = TimeUnit.MILLISECONDS.toMinutes(System.currentTimeMillis());
            long max = cur + TimeUnit.HOURS.toMinutes(1);
            BufferedImage bimg;
            SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
            Rectangle2D r = f.getStringBounds("14:68", new FontRenderContext(null, RenderingHints.VALUE_TEXT_ANTIALIAS_DEFAULT, RenderingHints.VALUE_FRACTIONALMETRICS_DEFAULT));
            int width = (int) Math.round(r.getWidth());
            int height = (int) Math.round(r.getHeight());
            int y = (int) Math.round(Math.abs(r.getY()));
            for (long i = cur; i < max; i++) {
                System.out.println((i - cur) + "/" + (max - cur));

                String newStr = sdf.format(new Date(TimeUnit.MINUTES.toMillis(i)));
                bimg = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_INDEXED);
                Graphics2D g2d = bimg.createGraphics();
                g2d.setFont(f);
                g2d.setRenderingHints(new RenderingHints(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON));
                g2d.setPaint(brass);
                g2d.drawString(newStr, 0, y);
                g2d.dispose();
                writer.writeToSequence(bimg);
            }
            byte[] arr = getBytes(output);
            writer.close();
            output.close();
            bos.close();

            return Response.ok(arr).expires(new Date(TimeUnit.MINUTES.toMillis(max))).build();
        } catch (IOException e) {
            Log.warn("/getCurrentTime threw Exception:", e);
            return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(e).type(MediaType.TEXT_HTML).build();
        }
    }