encoding problem

Hi!all.....

I used a servlet to read the request as Stirng str=request.getParameter(field name), and then write the str into a FileWriter, everything is okay, but when I open the file I created. I found all of my str become "?.?.?". Because I used Big-5(Tranditional Chinese)be my value, but I have set my containtype(such as contentType="text/html;charset=Big5"), I dont know what's happen!!!

I wanna know 2 things:

first: what do I lose in the part of char encoding?

second: FileWriter can't work well in Big-5?

thanx for your reading, best regard!!!

[591 byte] By [s88a] at [2007-9-19]