@RequestMapping(value = "/deleteServiceTicket/{serviceId}", produces = "text/plain;charset=utf-8")
 @ResponseBody
 public String deleteServiceTicket(@PathVariable String serviceId) {
   try {
     serviceTicketCreateService.deleteServiceTicketById(serviceId);
     return "{\"flag\" : \"success\"}";
   } catch (Exception e) {
     e.printStackTrace();
     return "{\"flag\" : \"failure\"}";
   }
 }