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I've solved it using the org.apache.commons.codec package from Apache. The source java files are available for download:
Codec - Home

It contains the method...

It doesn't work if there are some characters (that are not supposed to be in a URL):


Exception in thread "main" java.lang.IllegalArgumentException: URLDecoder: Illegal hex characters in escape...

Yes, but convert all the cases.

You can check here a webpage that does online conversion, but I would like to do it with software: Encode/Decode Quoted Printable - Webatic

The source is a contact VCARD, and each entry goes on one line if not quoted printable but goes in one or more is used the ENCODING=QUOTED-PRINTABLE string, indicating an ending with the '='...

I want to decode data with the encoding ENCODING=QUOTED-PRINTABLE;CHARSET=UTF-8:

to standard text. For example =0D=0A turns into \n and so on, but I was unable to find a specific standard java...