code: public String quotedPrintable(Object content)
      {
          if (content != null) {
              try {
                  return new QuotedPrintableCodec().encode(String.valueOf(content));
              } catch (EncoderException ex) {
                  // Just return null
              }
          }
          return null;
      }
docs: Encode a text using the Quoted-Printable format, as specified in section 6.7 of <a
  href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>. UTF-8 is used as the character encoding, and no line
  breaking is performed.
  
  @param content the text to encode
  @return the text converted into the Quoted-Printable format