public static boolean deleteFolder(String url) {

        File file = new File(url);

        if (!file.exists()) {

            return false;

        }

        if (file.isFile()) {

            file.delete();

            return true;

        } else {

            File[] files = file.listFiles();

            for (int i = 0; i < files.length; i++) {

                String root = files[i].getAbsolutePath();//得到子文件或文件夹的绝对路径

                //System.out.println(root);

                deleteFolder(root);

            }

            file.delete();

            return true;

        }

    }