Java只给汉字转URLEncoder

public static String encode(String str, String charset)
            throws UnsupportedEncodingException {
        Pattern p = Pattern.compile("[u4e00-u9fa5]+");
        Matcher m = p.matcher(str);
        StringBuffer b = new StringBuffer();
        while (m.find()) {
            m.appendReplacement(b, URLEncoder.encode(m.group(0), charset));
        }
        m.appendTail(b);
        return b.toString();
    }