apache commons vfs 文件夹监控

package test.vfs;

import java.io.File;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.vfs2.FileChangeEvent;
import org.apache.commons.vfs2.FileListener;
import org.apache.commons.vfs2.FileName;
import org.apache.commons.vfs2.FileObject;
import org.apache.commons.vfs2.FileSystemException;
import org.apache.commons.vfs2.FileSystemManager;
import org.apache.commons.vfs2.VFS;
import org.apache.commons.vfs2.impl.DefaultFileMonitor;

/**
 * Hello world!
 * 
 */
public class App {
    public static final Log log = LogFactory.getLog(App.class);

    public static void main(String[] args) {
        FileSystemManager fsManager = null;
        FileObject listendir = null;
        try {
            fsManager = VFS.getManager();
            listendir = fsManager.resolveFile(new File("E://vfs").getAbsolutePath());
        } catch (FileSystemException e) {
            log.error("监视文件夹出错了", e);
            e.printStackTrace();
        }
        
        System.out.println(listendir.getName());
        
        // 定义一个监视器及事件处理程序
        DefaultFileMonitor fm = new DefaultFileMonitor(new FileListener() {
            public void fileCreated(FileChangeEvent event) throws Exception {
                monitor(event);
            }

            public void fileDeleted(FileChangeEvent event) throws Exception {
                monitor(event);
            }

            public void fileChanged(FileChangeEvent event) throws Exception {
                monitor(event);
            }
            
            private void monitor(FileChangeEvent event) {
                FileObject fileObject = event.getFile();
                FileName fileName = fileObject.getName();
                System.out.println(fileName.toString());
            }
        });
        
        
        fm.setRecursive(true); // 设置为级联监控
        fm.addFile(listendir); // 增加监控文件
        fm.start();  // 启动监视器
        
        for(;;){
            try {
                Thread.currentThread().sleep(1000);
                System.out.println(System.currentTimeMillis());
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}