Java中文件夹上所有文件的监听方法

Java中文件夹下所有文件的监听方法
public class FileManager
{
    // 注册的监听文件列表
    private static HashMap<String, FileListener> FMap = new HashMap<String, FileListener>();
    // 配置文件路径(从命令行传入)
    private String configFile = null;
    // 默认配置文件（从JAR包中加载）
    private String defaultConfigFile = "FileListener.properties";
    private static Logger logger = Logger.getLogger(FileManager.class);
    public static void main(String[] args)
    {
        FileManager fm = new FileManager();
        if (args.length > 0)
        {
            fm.configFile = args[1];
        }
        if (FMap.size() == 0)
        {
            fm.regFileListener();
            logger.info("Execute Command sucess.");
            System.out.println("loading file.......");
        }
        else
        {
            logger.info("The program is running.can not run again.");
        }
    }

    /**
     * 注册需要监听的文件(从配置文件读取配置信息)
     */
    public void regFileListener()
    {
        Properties prop = loadProperties();
        String num = prop.getProperty("ListenerFileNum");
        System.out.println(num);
        String Interval = prop.getProperty("Interval");
        if (("".equals(num)) || (null == num) || ("".equals(Interval))
                || (null == Interval))
        {
            logger.error("Configuration error,please check it! Inteval:"
                    + Interval + ",ListenerFileNum:" + num);
        }
        else
        {
            int number = Integer.parseInt(num);         
            int t = Integer.parseInt(Interval);
            for (int i = 0; i < number; i++)
            {
                String filePath = prop.getProperty("ListenerFile" + (i + 1));
                if (filePath != null)
                {
                    if (filePath.endsWith(File.separator))
                    {
                        regBatchFile(filePath, t);
                    }
                    else
                    {
                        regSingleFile(filePath, t);
                    }
                }
                else
                {
                    logger.error("Configuration item[LitenerFileNum]" + (i + 1)
                            + "[does not exist.ignore]...");
                }
            }
        }
    }   
    public void regBatchFile(String path,int interval)
    {
        File file=new File(path);
        if(file.isDirectory())
        {
            //file.list()--->得到这个目录下的所有文件名   数组
            for(String s:file.list())
            {
                String filePath=new StringBuffer(path).append(s).toString();
                regSingleFile(filePath,interval);
            }
        }
    }
    public void regSingleFile(String path,int interval)
    {
        FileListener fileTask=null;
        if(path.endsWith(".properties"))
        {
            fileTask=new PropertyFileListener(path);
        }
        else if(path.endsWith(".xml"))
        {
            fileTask=new XMLFileListener(path);
        }
        else
        {
            return;
        }
        fileTask.loadFile();
        Timer timer=new Timer();
        timer.schedule(fileTask, new Date(), interval);
        String fileName=path.substring(path.lastIndexOf(File.separator)+1, path.length());       
        FMap.put(fileName, fileTask);
    }