public String readToken() throws Throwable
	{
		File file = new File("token.txt");
		if (file.exists())
		{
			String t = Files.readAllLines(file.toPath(), Charsets.ISO_8859_1).get(0);
			if (t.matches("^[a-zA-Z0-9]{16}$") && t.length() == 16)
			{
				return t;
			}
		}
		return null;
	}