// 修改兑换状态
 @Post("changeOpStatus")
 public String changeOpStatus(final Invocation inv, @Param("id") final Integer id) {
   String res = actGuessGameConfService.changeOpStatus(id);
   if (res == null) {
     return "@json:" + "{\"status\":\"" + "1" + "\"}";
   } else {
     return "@json:" + "{\"status\":\"" + "0" + "\",\"exchangeTime\":\"" + res + "\"}";
   }
 }