<Nice>
import java.nio.*;
import java.nio.charset.*;
import org.apache.commons.codec.net.*;

public void main(Template this, Cms cms) {
  List<String> charsets = new LinkedList(["utf-8", "windows-1251"]);
  cms.writebr("qs: " cms.getRequest().getQueryString());
  cms.writebr("искать: " cms.decodeFromQueryString("искать", charsets));
  if (charsets.size() == 1) cms.writebr("кодировка найдена: " charsets);
  cms.writebr("<a href='" cms.go() "?искать=Индия'>проверка</a>");
}

/**
 * Find the character set which matches the encoding of the given parameter.<br>
 * For this charset detection to work, parameter must be susceptible
 * to charset and URL encodings, for example,
 * parameter "искать" will be charset and URL encoded by browsers.
 * @param pName the name of the CGI parameter to decode.
 * @param charsets the list of charsets to try to decode the parameter with.
 * @return {@code null} if the given parameter wasn't found in these charsets.
 */
?String decodeFromQueryString(Cms cms, String pName, List<String> charsets) {
  let request = cms.getRequest();
  let qs = request.getQueryString();
  if (qs == null) return null;
  return decodeFromQueryString(qs, pName, charsets);
}
/**
 * Perform parameter character set detection on the given query string.
 * @see decodeFromQueryString(Cms, String, List)
 */
?String decodeFromQueryString(String qs, String pName, List<String> charsets) {
  let parameters = new java.util.StringTokenizer(qs, "&");
  let urlCodec = new URLCodec();
  HashMap<String, CharsetDecoder> decoders = new HashMap(charsets.size());
  while (parameters.hasMoreTokens()) {
    let pair = parameters.nextToken();
    int eqIndex = pair.indexOf('=');
    String name, value;
    if (eqIndex == -1) {
      name = pair;
      value = "";
    } else {
      name = pair.substring(0, eqIndex);
      value = pair.substring(++eqIndex);
    }
    if (name.equals(pName)) return value;
    for (charsetName : charsets) {
      // MSIE will send the data in the UTF-8 or any other encoding.
      // The data is left unmodified by servlet container in the characters of the query string
      // (becouse first 256 unicode code points are identical to ISO-8859-1).
      ?CharsetDecoder decoder = decoders.get(charsetName);
      if (decoder == null) decoders.put(charsetName, decoder = Charset.forName(charsetName).newDecoder());
      byte[] bytes = new byte[name.length()];
      int num = bytes.length; while(--num >= 0) bytes[num] = byte(int(name.charAt(num)));
      try {
        let msieName = decoder.decode(ByteBuffer.wrap(bytes)).toString();
        if (pName.equals(msieName)) {
          byte[] vBytes = new byte[value.length()];
          num = vBytes.length; while(--num >= 0) vBytes[num] = byte(int(value.charAt(num)));
          return decoder.decode(ByteBuffer.wrap(vBytes)).toString();
        }
      } catch (MalformedInputException skip) {}
      // Try using URL-encoded name.
      byte[] uBytes = urlCodec.decode(bytes);
      try {
        String got = decoder.decode(ByteBuffer.wrap(uBytes)).toString();
        if (pName.equals(got)) {
          byte[] vBytes = new byte[value.length()];
          num = vBytes.length; while(--num >= 0) vBytes[num] = byte(int(value.charAt(num)));
          return decoder.decode(ByteBuffer.wrap(urlCodec.decode(vBytes))).toString();
        }
      } catch (MalformedInputException skip) {}
    }
  }
  return null;
}
</Nice>