接手一个烫手的山芋，数据保存这么写的，纠结要不要改，貌似也没什么太大问题，就是有些特殊字符就...

class test{

	private static final String user_path = "D:\\a_user1\\";

	private static String GetUserName() {
		File[] list = new File(user_path + "username").listFiles();
		if (list != null && list.length >= 1) {
			return list[0].getName();
		}
		return null;
	}

	private static void SetUserName(String UserName) {
		File[] list = new File(user_path + "username/").listFiles();
		if (list != null && list.length >= 1)
			for (File temp : list) {
				temp.delete();
			}
		new File(user_path + "username/" + UserName).mkdirs();
	}

	public static void main(String[] args) {
		System.out.println(GetUserName());
		SetUserName("卢四六");
    }
}