String playlistId = req.getParameter("playlistId");
String channelId = req.getParameter("channelId");
String keyword = req.getParameter("keyword");
TubeSearchModel model = new TubeSearchModel();
model.setPage(page);
model.search(playlistId, channelId, keyword);
req.setAttribute("playlistId", playlistId);
req.setAttribute("channelId", channelId);
req.setAttribute("keyword", keyword);
req.setAttribute("url", req.getRequestURL().toString());