public static boolean isBlankChar(char c) {
		return isBlankChar((int) c);
	}
@Test
	public void trimTest() {
		//此字符串中的第一个字符为不可见字符: '\u202a'
		final String str = "‪C:/Users/maple/Desktop/tone.txt";
		assertEquals('\u202a', str.charAt(0));
		assertTrue(CharUtil.isBlankChar(str.charAt(0)));
	}