public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
try {
ChannelModel model = new ChannelModel();
model.prepareList();
req.setAttribute("model", model);
req.setAttribute("url", req.getRequestURL().toString());
req.getRequestDispatcher("/list_channel.jsp").forward(req, resp);
} catch (Exception e) {
log.warning(e.toString());