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;
 }