Java 实现实时监听文件夹是否有新文件增加并上传服务器功能

 private static String path = "E:\\Kankan"; public static void getFile() throws FileNotFoundException, IOException{ final Timer timer = new Timer(); timer.schedule(new TimerTask() { public void run() { WatchKey key; try { WatchService watchService = FileSystems.getDefault().newWatchService(); Paths.get(path).register(watchService, StandardWatchEventKinds.ENTRY_CREATE); while (true) { File file = new File(path);//path为监听文件夹 File[] files = file.listFiles(); System.out.println("等待图片加载！"); key = watchService.take();//没有文件增加时，阻塞在这里 for (WatchEvent event : key.pollEvents()) { String fileName = path+"\\"+event.context(); System.out.println("增加文件的文件夹路径"+fileName); File file1 = files[files.length-1];//获取最新文件 System.out.println(file1.getName());//根据后缀判断 url = uploadFile(file1,uploadAddres);//上传服务器 }if (!key.reset()) { break; //中断循环 } } }catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } }, 2000 , 3000);//第一个数字2000表示，2000ms以后开启定时器,第二个数字3000，表示3000ms后运行一次run }

 import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.nio.file.FileSystems;//阻塞式IO流jar包 import java.nio.file.Paths; import java.nio.file.StandardWatchEventKinds; import java.nio.file.WatchEvent; import java.nio.file.WatchKey; import java.nio.file.WatchService; import java.sql.Timestamp; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Timer; import java.util.TimerTask;

 /** * 将file文件上传到指定dir文件夹中 * @param file：待上传文件 * @param dir：指定路径 * @throws FileNotFoundException * @throws IOException */ final static String uploadAddres = System.getProperty("catalina.home")+"\\webapps\\TiaoZhanB\\uploadFile"; public static String uploadFile(File file , String dir) throws FileNotFoundException, IOException { String imgURL = null; try { InputStream in = new FileInputStream(file); System.out.println("服务器路径：" + dir); // 获取文件名称 String fileName = file.getName(); // 路径和文件名丢进file对象里 File uploadFile = new File(dir, fileName); // 输出流 OutputStream out = new FileOutputStream(uploadFile); // 设置文件大小1MB byte[] buffer = new byte[1024 * 1024]; int length; // 用循环从流中读取文件的大小 while ((length = in.read(buffer)) > 0) { out.write(buffer, 0, length); } // 设置图片标题和全路径 imgURL = "uploadFile/" + fileName; System.out.println("绝对路径为"+imgURL); // 关闭输入流输出流，释放内存 in.close(); out.close(); } catch (Exception e) { e.printStackTrace(); } return imgURL; }