Java启动定时任务

现在项目中需要开发一个定时任务，去清理指定目录下过期的文件，有几种实现定时器的方法定时器代码如下
方法一：
public class FileProcesser
{
    private static Logger logger = Logger.getLogger(FileProcesser.class);

    public static void start()
    {
        int startHour = 0;
        int startMinute = 3;
        // 读取配置文件中启动定时任务时间
        String[] startTime = FileConfig.fileConfig.get(
                FileConfig.START_CLEARFILE_TIME).split(":");
        try
        {
            startHour = Integer.parseInt(startTime[0]);
            startMinute = Integer.parseInt(startTime[1]);
        }
        catch (Exception e)
        {
            logger.error("get Config Info fail", e);
        }
        scheduleProcessFile(getDelay(startHour, startMinute), 86400000);
    }

    private static void scheduleProcessFile(long delay, long period)
    {
        try
        {
            ScheduledExecutorService ses = Executors
                    .newSingleThreadScheduledExecutor();
            ses.scheduleAtFixedRate(new FileProcessTask(), delay, period,
                    TimeUnit.MILLISECONDS);
        }
        catch (Exception e)
        {
            logger.error("scheduleProcessFile Exception", e);
        }
    }

    private static long getDelay(int hour, int minuts)
    {
        // 获得定时时间毫秒
        Calendar sendCal = Calendar.getInstance();
        sendCal.set(sendCal.get(Calendar.YEAR), sendCal.get(Calendar.MONTH),
                sendCal.get(Calendar.DAY_OF_MONTH), hour, minuts);
        long sendAtTime = sendCal.getTimeInMillis();
        // 获得当前时间毫秒
        Calendar now = Calendar.getInstance();
        long newTime = now.getTimeInMillis();
        // 如果过了定时时间，24小时后在处理
        if (newTime > sendAtTime)
        {
            sendCal.set(sendCal.get(Calendar.YEAR),
                    sendCal.get(Calendar.MONTH), sendCal
                            .get(Calendar.DAY_OF_MONTH) + 1, hour, minuts);
            sendAtTime = sendCal.getTimeInMillis();
        }
        long delayTime = sendAtTime - newTime;
        return delayTime;
    }
}
方法二：
private Timer timer= null;

private void start()
    {
        // 清除过期的定时器任务，每2个小时过期时间间隔检查一次容器
        TimerTask task = new TimerTask()
        {
            @Override
            public void run()
            {
                //   处理定时任务        
            }
        };
        timer= new Timer(true);
        timer.schedule(task, 0, 1000 * 60 * 60 * 2);
    }