java汉字与unicode互转工具类

   /**
	 *  unicode 转换成 中文
	 * @param theString
	 * @return
	 * @author: test  
	 * @Createtime: May 27, 2013
	 */
	public static String decodeUnicode(String theString) {
		char aChar;
		int len = theString.length();
		StringBuffer outBuffer = new StringBuffer(len);
		for (int x = 0; x < len;) {
			aChar = theString.charAt(x++);
			if (aChar == '\\') {
				aChar = theString.charAt(x++);
				if (aChar == 'u') {
					// Read the xxxx
					int value = 0;
					for (int i = 0; i < 4; i++) {
						aChar = theString.charAt(x++);
						switch (aChar) {
						case '0':
						case '1':
						case '2':
						case '3':
						case '4':
						case '5':
						case '6':
						case '7':
						case '8':
						case '9':
							value = (value << 4) + aChar - '0';
							break;
						case 'a':
						case 'b':
						case 'c':
						case 'd':
						case 'e':
						case 'f':
							value = (value << 4) + 10 + aChar - 'a';
							break;
						case 'A':
						case 'B':
						case 'C':
						case 'D':
						case 'E':
						case 'F':
							value = (value << 4) + 10 + aChar - 'A';
							break;
						default:
							throw new IllegalArgumentException(
									"Malformed   \\uxxxx   encoding.");
						}
					}
					outBuffer.append((char) value);
				} else {
					if (aChar == 't')
						aChar = '\t';
					else if (aChar == 'r')
						aChar = '\r';

					else if (aChar == 'n')

						aChar = '\n';

					else if (aChar == 'f')

						aChar = '\f';

					outBuffer.append(aChar);

				}

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

	/**
	 * 中文 转换成 unicode
	 * @param s
	 * @return
	 * @author: PLT  
	 * @Createtime: May 27, 2013
	 */
	public static String toUnicode(String s) {
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < s.length(); ++i) {
			if (s.charAt(i) <= 256) {
				sb.append("\\u00");
			} else {
				sb.append("\\u");
			}
			sb.append(Integer.toHexString(s.charAt(i)));
		}
		return sb.toString();
	}