java实现短信验证码5分钟有效时间

@RequestMapping(value = "sendMessage",method = RequestMethod.GET)
public Object sendMessage(final HttpServletRequest request){
 String phone=request.getParameter("phone");
 int times=userService.messageSendToday(phone); //二次验证，单个手机号每日发送上限
 if(times <= MAX_PER_DAY){
  String checkCode=GenerateRandomCode.createRandomNumber(6);
  final HttpSession httpSession=request.getSession();
  httpSession.setAttribute("checkCode",checkCode);
  CheckCodeMessage checkCodeMessage=new CheckCodeMessage(phone,checkCode);
  try {
   HttpSender.batchSend(checkCodeMessage);
   //TimerTask实现5分钟后从session中删除checkCode
   final Timer timer=new Timer();
   timer.schedule(new TimerTask() {
    @Override
    public void run() {
     httpSession.removeAttribute("checkCode");
     System.out.println("checkCode删除成功");
     timer.cancel();
    }
   },5*60*1000);
  } catch (Exception e) {
   e.printStackTrace();
  }
  return "redirect:/index.jsp";
 }
}

//TimerTask实现5分钟后从session中删除checkCode
final Timer timer=new Timer();
timer.schedule(new TimerTask() {
 @Override
 public void run() {
  httpSession.removeAttribute("checkCode");
  System.out.println("checkCode删除成功");
  timer.cancel();
 }
},5*60*1000);