How to save file in unicode?

Hi all

I have a problem about file saving.

I have some unicode string, and I want to save it as a file, then use newWebView to show them as html.

The problem is these string contain the unicode like chinese, after I saving them in the device, I show them in html, all of this is wrong character set. 

Can I show them normally?

Thank you all very much.

can anyone give me some suggestion? thank you.

can anyone give me some suggestion? thank you.