比较二个文件的最后修改时间FileListener

import java.io.File;

import java.text.SimpleDateFormat;

import java.util.Timer;

import java.util.TimerTask;

public class FileListener {

    public static void main(String[] args) {

        FileListener fileListener = new FileListener();

        fileListener.timer = new Timer(true);

        fileListener.start();

    }

    private Timer timer;

    private long currentTime = -1;

    private long lastModifiedTime = -1;

    private long times = 1;

    private long pollingInterval = 1000 * times;

    private String filePath = "c:\\test.txt";

    public FileListener() {

        File file = new File(filePath);

        lastModifiedTime = file.lastModified();

        currentTime = lastModifiedTime;

    }

    public void start() {

        timer.schedule(new FileMonitor(), 0, pollingInterval);

        while (true) {

            try {

                int ch = System.in.read();

                System.out.println("ch=" + ch);

                if (ch - 'c' == 0) {

                    System.out.println("quit");

                    timer.cancel();

                    break;

                }

            } catch (Exception e) {

                e.printStackTrace();

            }

        }

    }

    private class FileMonitor extends TimerTask {

        public void run() {

            File file = new File(filePath);

            lastModifiedTime = file.exists() ? file.lastModified() : -1;

            if (currentTime != lastModifiedTime) {//

                String string = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss SSS")

                        .format(lastModifiedTime);//

                System.out.println("File changed At:" + string);

                currentTime = lastModifiedTime;

            }

        }

    }

}