文件夹操作——方法

    public static void cleanFolder(String path) {
      File file = new File(path);
      if (file == null || !file.exists()) {
         file.mkdir();
      } else {
         deleteFiles(file);
//       file.mkdir();
      }
   }

   public static void deleteFiles(File subFile) {
      File[] fileList = subFile.listFiles();
      for (File f : fileList) {
         if (f.isDirectory()) {
            deleteFiles(f);
         } else {
            f.delete();
         }
      }
//    subFile.delete();
   }

public static boolean deleteFile(File dirFile) {

   if (!dirFile.exists()) {
      return false;
   }

   if (dirFile.isFile()) {
      return dirFile.delete();
   } else {

      for (File file : dirFile.listFiles()) {
         deleteFile(file);
      }
   }

   return dirFile.delete();
}



public static void CreateFileFolder() {
   File Directory = new File(downloadFilepath);

   if (!Directory.exists() && !Directory.isDirectory()) {
      Directory.mkdir();
      System.out.println("create the folder directly" + downloadFilepath);
   } else {
      deleteFile(Directory);
      Directory.mkdir();
      System.out.println("Deleted the foder at frist,then create the folder" + " " + downloadFilepath);
   }

}