public String addLink(HttpServletRequest request,
HttpServletResponse response,
@RequestParam(value = "id", required = false) Long id,
ModelMap model) throws Exception {
if (id != null) {
Link link = linkService.findLinkById(id);
model.addAttribute("linkAttribute", link);
} else {
model.addAttribute("linkAttribute", new Link());
}
return "/admin/link/linkForm";
}