具有特殊字符的xml，编码为u​​tf-8

Question

I have a few simple questions, because I got confused reading all difference responses.

1) If I have an xml with prolog: <?xml version="1.0" encoding="utf-8" ?> and I'm going to unmarshall it with Java (for example: JaXB). I suppose, that I can't put CROSS OF LORRAINE ( http://www.fileformat.info/info/unicode/char/2628/index.htm ) inside, but I can put "\☨", correct?

2) I've also heard that UTF-8 doesn't contain it, but anything in Unicode can be saved with encoding UTF-8 (or UTF-16), and here is an example from this page:

UTF-8 (hex) 0xE2 0x98 0xA8 (e298a8)

Is my reasoning correct? Can I use this form and put it in the xml with utf-8 encoding?

Answer 1

If your prolog specifying utf-8 encoding for xml:

<?xml version="1.0" encoding="utf-8" ?>

then you can use utf-8 characters directly, or you can encode them as ☨

Answer 2

It should be absolutely fine - UTF-8 can encode any Unicode character.

XML has some restrictions around control characters (U+0000 to U+001F) but U+2628 should be fine.

(Personally I prefer to go to unicode.org for definitive code charts, but U+2628 definitely appears here .)

You shouldn't need to worry about the UTF-8 side of things - you should be able to put the character in your data directly, and let JAXB do the encoding.

Answer 3

1 more addition...

just specifying the encoding in the prolog is not sufficient. u need to make sure the content is serialized using correct encoding.