我有这个:>upperFolder>folder0>file0>file...>filen>...>foldern>file0>file...>filen...我想要这个>upperFolder>folder0_file0>folder0_file...>folder0_filen>...>foldern_file0>foldern_file...>foldern_filen例如:我有这个:>Pictures>Wallpapers>Reaper>Skull>Night>Avatars>InuYasha>Battler>Valentino...我想要这个>Pictures>Wallpap