RTF is a format of data. not encoding.
Default encoding for Flex is UTF.
Data from RichTextEditor you can get in HTML format (property htmlText get you a string in HTML format with UTF8 encoding).
After that you can transform format as you want.
Yes,you are right,but I don't know how to conver html to the encoding of rtf,so I think whether there is a ready transformation class,I can use the class to conver html to rtf enconding.Or you can give me some information.I am a novice,thank you!