How could I fix the Chinese problem£¿

I have setup a xwiki in my computer. But failed to input Chinese into it. I changed the charset of these 3 files: web.xml xwiki.cfg velocity.properties and changed the default charset of MySql to gb2312 or gbk, I succeeded in writing Chinese into database but when reading Chinese out of MySql there is an error. UTF-8 couldn't work either, both in reading and writing. Could anyone tell me what to do? Thanks.