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); 
    }