How to set Locale ?

I would like to let user choose thier own language. But i don't know how to set Locale in LogonFormController (extends SimpleFormController). Any suggestion?

Since
RequestContextUtils.getLocale(Request).getLanguage ()= th
But
RequestContextUtils.getLocale(Request).getCountry( ) = empty string
So currency format shows improper. Then I would like to set a default Locale and let user change it as well. Could you please give me some example?

Thank you in advance.
A

You may review countries sample from Spring distribution. It shows how to configure/use multiple Locales.
HTH

Could you please send me some link? I tried to check it in http://www.springframework.org/demo.html -> countries But it can't accessed.
A

Countires source is included in Spring distribution. Look inside $SPRING_ROOT/samples/countries.