You need to define a farsi  filter for this to work.
Your filter should be like this
public class CharsetFilter implements Filter{

/**

* Logging output for this plug in instance.

*/

//private Log myLog = LogFactory.getLog(Constants.PACKAGE);

public void init(FilterConfig config) throws ServletException

{

//myLog.info(this.getClass().getName() + ": Starting filter.");

}

public void destroy()

{

//myLog.info(this.getClass().getName() + ": Destroying filter.");

}

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)

throws IOException, ServletException

{

request.setCharacterEncoding("UTF-8");

//myLog.info(this.getClass().getName() + ": Setting request to " +

// request.getCharacterEncoding());

chain.doFilter(request,response);

}

}

You also need to define your filter in web.xml such as this:
<filter>

<filter-name>FarsiFilter</filter-name>

<filter-class>com.project.filter.CharsetFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>FarsiFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

Please see this link :

http://www.chinajsp.net/tech/struts/i18n,1.htm

Just consider codes,I hope it will be useful

I had almost the same problem but i use Spring. I have solved it as here below:

put in your xml :


<bean id="messageSource"
class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<property name="basename" value="classpath:messages"></property>
<property name="defaultEncoding" value="UTF-8"></property>
</bean>