Portlet jsp pages can be localized by using jstl format tag with resource bu
ndles. However the language preference is set by using portal's 'edit my pre
ferences' dialog.
How can user locale or language choice be changed for anonymous users of por
tal?

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For anonymous users it's picked up from request header set by the browser. F
or IE see Internet options->Languages...

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True, but I need to control among a few locales the app supports. Can I ask 
user to select a language and then let portal treat it like it does when a r
egistered user sets language preference?
I've noticed that the portal inserts a locale obj in request when a user set
s language. Is there a way to mimic it?

Thanks,

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Websphere Portal Server supports the following command which you may insert 
in your theme or somewhere in the jsp.

<wps:url command="ChangeLanguage"><wps:urlParam name="locale"    value="fr"/
></wps:url>

<wps:url command="ChangeLanguage"><wps:urlParam name="locale"
value="fr_CH"/></wps:url>


Put the above command in anchor tag of html.
When user clicks on above provided links, the entire locale of the portal se
rver will be changed.

You can query the locale simply by calling PortletRequest objects getLocale(
) method. Or if you want to get simply the user locale try to get 'accept-la
nguage' header from request.

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