public static boolean isLong(String s) {
		if (StrUtil.isBlank(s)) {
			return false;
		}
		try {
			Long.parseLong(s);
		} catch (NumberFormatException e) {
			return false;
		}
		return true;
	}
@Test
	public void isLongTest() {
		assertTrue(NumberUtil.isLong("-12"));
		assertTrue(NumberUtil.isLong("256"));
		assertTrue(NumberUtil.isLong("0256"));
		assertTrue(NumberUtil.isLong("0"));
		assertFalse(NumberUtil.isLong("23.4"));
		assertFalse(NumberUtil.isLong(null));
		assertFalse(NumberUtil.isLong(""));
		assertFalse(NumberUtil.isLong(" "));
	}