How to change charset in struts2 to utf-8

Hi I have testfield in which I want to put test not in English(for example into Russian) but in my action class I get instead of text only ?????????. I trying to write simple filter which described Parameters charset conversion in struts2

but it still do not work.. can somebody help me

update I have this

<s:textfield key="index.login" name="login" />

I want to put into it test in Russian language and then send it to my action.but in my action class I get instead of text only ?????????.to fix this problem I need to change charset into utf8 instead of win1251.