public static String toUnicodeHex(int value) {
		final StringBuilder builder = new StringBuilder(6);

		builder.append("\\u");
		String hex = toHex(value);
		int len = hex.length();
		if (len < 4) {
			builder.append("0000", 0, 4 - len);// 不足4位补0
		}
		builder.append(hex);

		return builder.toString();
	}
@Test
	public void toUnicodeHexTest() {
		String unicodeHex = HexUtil.toUnicodeHex('\u2001');
		assertEquals("\\u2001", unicodeHex);

		unicodeHex = HexUtil.toUnicodeHex('你');
		assertEquals("\\u4f60", unicodeHex);
	}