public static String fixedPhone(String num) {
		if (StrUtil.isBlank(num)) {
			return StrUtil.EMPTY;
		}
		return StrUtil.hide(num, 4, num.length() - 2);
	}
@Test
	public void fixedPhoneTest() {
		assertEquals("0915*****79", DesensitizedUtil.fixedPhone("09157518479"));
	}