Java日期格式验证

    if(strOrderCutTime != null && strOrderCutTime != "" && strOrderCutTime.length() == 8)
    {
     if(strOrderCutTime.length() != 8)
     {
      showmessage(request,response,"Order Cut Time format must be HH:MM:SS only.");
      performDisplay(request, response, session);
         return;
     }
     
     SimpleDateFormat s = new SimpleDateFormat("HH:mm:ss");
     try
     {
      Date t = s.parse(strOrderCutTime);
     }
     catch(Exception e)
     {
      showmessage(request,response,"Order Cut Time format must be HH:MM:SS only.");
      performDisplay(request, response, session);
         return;
     }     
    }