@Override
    public boolean deleteFile(String fileName) {//传入绝对路径
        File file = new File(fileName);
        if (file.exists() && file.isFile() || file.exists() && file.isDirectory()) {
            if (file.delete()) {
                return true;
            } else {
                return false;
            }
        } else {
            return false;
        }
    }