擷取字元串實際長度

public class StringUtil {
	// 擷取字元串實際長度
	public static int getStringLen(String s) {
		int len = 0; // 儲存實際長度的字元串
		if (s == null || s.length() == 0) {
			len = 0; // 是空值或空字元串長度為0
		} else {
			for (int i = 0; i < s.length(); i++) {
				char c = s.charAt(i);
				if (isChinese(c)) { // 是中文漢字和符号
					len = len + 2; // 長度加2
				} else {
					len++;// 其它長度加1
				}
			}
		}
		return len;
	}

	// 根據Unicode編碼完美的判斷中文漢字和符号
	private static boolean isChinese(char c) {
		Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);
		if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
				|| ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B
				|| ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS
				|| ub == Character.UnicodeBlock.GENERAL_PUNCTUATION) {
			return true;
		}
		return false;
	}
}