汉字转UniCode

public class Test1 {
	
	private static final char[] hexDigit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A',

        'B', 'C', 'D', 'E', 'F' };

	
	private static char toHex(int nibble) {

        return hexDigit[(nibble & 0xF)];

    }
	
	/**
	 * 将字符串编码成 Unicode 形式的字符串. 如 "黄" to "\u9EC4"
	 * 
	 * Converts unicodes to encoded \\uxxxx and escapes
	 * 
	 * special characters with a preceding slash
	 * @param theString
	 *            待转换成Unicode编码的字符串。
	 * @param escapeSpace
	 *            是否忽略空格，为true时在空格后面是否加个反斜杠。
	 * @return 返回转换后Unicode编码的字符串。
	 */

	public static String toEncodedUnicode(String theString, boolean escapeSpace) {

		int len = theString.length();
		int bufLen = len * 2;
		if (bufLen < 0) {
			bufLen = Integer.MAX_VALUE;
		}
		StringBuffer outBuffer = new StringBuffer(bufLen);
		for (int x = 0; x < len; x++) {
			char aChar = theString.charAt(x);
			// Handle common case first, selecting largest block that
			// avoids the specials below
			if ((aChar > 61) && (aChar < 127)) {
				if (aChar == '\\') {
					outBuffer.append('\\');
					outBuffer.append('\\');
					continue;
				}
				outBuffer.append(aChar);
				continue;
			}
			switch (aChar) {
			case ' ':
				if (x == 0 || escapeSpace)
					outBuffer.append('\\');
				outBuffer.append(' ');

				break;

			case '\t':

				outBuffer.append('\\');

				outBuffer.append('t');

				break;

			case '\n':

				outBuffer.append('\\');

				outBuffer.append('n');

				break;

			case '\r':

				outBuffer.append('\\');

				outBuffer.append('r');

				break;

			case '\f':

				outBuffer.append('\\');

				outBuffer.append('f');

				break;

			case '=': // Fall through

			case ':': // Fall through

			case '#': // Fall through

			case '!':

				outBuffer.append('\\');

				outBuffer.append(aChar);

				break;

			default:

				if ((aChar < 0x0020) || (aChar > 0x007e)) {

					// 每个unicode有16位，每四位对应的16进制从高位保存到低位

					outBuffer.append('\\');

					outBuffer.append('u');

					outBuffer.append(toHex((aChar >> 12) & 0xF));

					outBuffer.append(toHex((aChar >> 8) & 0xF));

					outBuffer.append(toHex((aChar >> 4) & 0xF));

					outBuffer.append(toHex(aChar & 0xF));

				} else {

					outBuffer.append(aChar);
				}
			}
		}
		return outBuffer.toString();
	}

	public static void main(String[] args) {
		System.out.println(DateUtil.praseDate("2014-02-24"));
	}
}