public static boolean isBlank(String str) {
        return StringUtils.isBlank(str);
    }
@Test
    public void testIsBlank() {
        assertThat(UtilAll.isBlank("Hello ")).isFalse();
        assertThat(UtilAll.isBlank(" Hello")).isFalse();
        assertThat(UtilAll.isBlank("He llo")).isFalse();
        assertThat(UtilAll.isBlank("  ")).isTrue();
        assertThat(UtilAll.isBlank("Hello")).isFalse();
    }