把转换Unicode为原始字符的方法

支持任何Unicode字符串的转换。

 

private static final Pattern REG_UNICODE = Pattern.compile("[0-9A-Fa-f]{4}");

public static String unicode2String(String str) {
	StringBuilder sb = new StringBuilder();
	int len = str.length();
	for (int i = 0; i < len; i++) {
		char c1 = str.charAt(i);
		if (c1 == '\\' && i < len - 1) {
			char c2 = str.charAt(++i);
			if (c2 == 'u' && i <= len - 5) {
				String tmp = str.substring(i + 1, i + 5);
				Matcher matcher = REG_UNICODE.matcher(tmp);
				if (matcher.find()) {
					sb.append((char) Integer.parseInt(tmp, 16));
					i = i + 4;
				} else {
					sb.append(c1).append(c2);
				}
			} else {
				sb.append(c1).append(c2);
			}
		} else {
			sb.append(c1);
		}
	}
	return sb.toString();
}