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();

    }