@RequestMapping("/deleteUser")
 public void deleteUser(String id, HttpServletRequest request, HttpServletResponse response) {
   String result = "{\"msg\":\"success\"}";
   String error = "{\"msg\":\"error\"}";
   try {
     PrintWriter pw = response.getWriter();
     if (userService.deleteUser(id)) {
       pw.print(result);
     } else {
       pw.print(error);
     }
   } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
   }
 }