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