@Test
	public void testTotalAllFiles() {
		File directory = new File("E:\\books");
		System.out.println(directory.getAbsolutePath());
		System.out.println(directory.getFreeSpace() / 1024 / 1024 / 1024);
		System.out
				.println(FileUtil.totalFileInfo(directory).getTotalFileSize() / 1024 / 1024 / 1024);
	}