Are you sure your page encoding (the one in HTTP header, not the one in
meta i.e. charset), is a unicode  enable one(like UTF-8)? (Can get this via
right click in Firefox and see Page Info-> Encoding)

I think the problem  is with in your page encoding. Change it to UTF-8 and
every thing will be all right. You can use JSP's "<%@ page
pageEncoding="UTF-8" %>" tag to achive this.

The stuff that u provided aren’t Unicode!
Java Unicode characters start with \u ,yours are HTML Unicode. You may supply your methods either Farsi characters or Unicode representation of them.
To convert Farsi to Unicode you may use native2ascii tool provided by JVM or use this
site http://www.snible.org/java2/uni2java.html

String greeting=”\u062F\u0631\u0648\u062F”; //Drood in Farsi