使用apache common-io 监控文件变化

package common.io;


import org.apache.commons.io.filefilter.FileFilterUtils;
import org.apache.commons.io.monitor.FileAlterationListener;
import org.apache.commons.io.monitor.FileAlterationMonitor;
import org.apache.commons.io.monitor.FileAlterationObserver;


import java.io.File;
import java.util.concurrent.TimeUnit;


/**
 * Created with IntelliJ IDEA.
 * User: superman
 * Date: 14-1-5
 * Time: 上午11:43
 * To change this template use File | Settings | File Templates.
 */
public class Example3 {
    public static void main(String[] args) throws Exception{
        File directory = new File("D:/test");
        // 轮询间隔 5 秒
        long interval = TimeUnit.SECONDS.toMillis(5);
        // 创建一个文件观察器用于处理文件的格式
        FileAlterationObserver observer = new FileAlterationObserver(directory, FileFilterUtils.and(
                FileFilterUtils.fileFileFilter(),FileFilterUtils.suffixFileFilter(".txt")));
        //设置文件变化监听器
        observer.addListener(new MyFileListener());
        FileAlterationMonitor monitor = new FileAlterationMonitor(interval,observer);
        monitor.start();
        //Thread.sleep(30000);
        //monitor.stop();
    }
}

　　

final class MyFileListener implements FileAlterationListener{
    @Override
    public void onStart(FileAlterationObserver fileAlterationObserver) {
        System.out.println("monitor start scan files..");
    }


    @Override
    public void onDirectoryCreate(File file) {
        System.out.println(file.getName()+" director created.");
    }


    @Override
    public void onDirectoryChange(File file) {
        System.out.println(file.getName()+" director changed.");
    }


    @Override
    public void onDirectoryDelete(File file) {
        System.out.println(file.getName()+" director deleted.");
    }


    @Override
    public void onFileCreate(File file) {
        System.out.println(file.getName()+" created.");
    }


    @Override
    public void onFileChange(File file) {
        System.out.println(file.getName()+" changed.");
    }


    @Override
    public void onFileDelete(File file) {
        System.out.println(file.getName()+" deleted.");
    }


    @Override
    public void onStop(FileAlterationObserver fileAlterationObserver) {
        System.out.println("monitor stop scanning..");
    }
}