Loading Locale From Post/Get Parameter

This page volition summarize how to charge a resources bundle dynamically from a GET/POST parameter. 

1.) In your postal service xhtml template, brand certain that y'all define f:view locale earlier the h:body tag:

<f:view locale="#{languageBean.currentLocale}" /> 

2.) Create a LanguageBean managed-bean:

package com.sido.mg.mbean;  import java.io.Serializable; import java.util.LinkedHashMap; import java.util.Locale; import java.util.Map;  import javax.enterprise.context.SessionScoped; import javax.faces.context.FacesContext; import javax.inject.Inject; import javax.inject.Named;  import org.slf4j.Logger; import org.slf4j.LoggerFactory;  /**  * @author Edward P. Legaspi  * @since January 17, 2013  */ @Named @SessionScoped populace shape LanguageBean implements Serializable {  person static concluding long serialVersionUID = 1L;  person static Map supportedLocales;  person Logger log = LoggerFactory.getLogger(LanguageBean.class);   @Inject  person transient Locale currentLocale;   static {   supportedLocales = novel LinkedHashMap<>();   supportedLocales.put("English", Locale.US);   supportedLocales.put("日本語 言語", Locale.JAPAN);  }   populace Map getSupportedLocales() {   provide supportedLocales;  }   populace Locale getCurrentLocale() {   if (currentLocale == zilch || currentLocale.equals("")) {    currentLocale = Locale.US;   }    provide currentLocale;  }   populace void setCurrentLocale(Locale currentLocale) {   this.currentLocale = currentLocale;  }   populace String switchLanguage(String language) {   log.debug("changing locale to={}", language);   if (language.equals("EN")) {    currentLocale = Locale.US;   } else {    currentLocale = Locale.JAPAN;   }    provide FacesContext.getCurrentInstance().getViewRoot().getViewId() + "?faces-redirect=true";  }   populace String getEntrustLocale() {   if (currentLocale == Locale.US) {    provide "9";   } else {    provide "28";   }  } } 

3.) The flags:

<ul class="right">  <li><p:commandLink immediate="true"    action="#{languageBean.switchLanguage('EN')}">    <h:graphicImage library="img" name="flags/us.png"></h:graphicImage>   </p:commandLink></li>  <li><p:commandLink immediate="true"    action="#{languageBean.switchLanguage('JP')}">    <h:graphicImage library="img" name="flags/jp.png"></h:graphicImage>   </p:commandLink></li> </ul> 

4.) Now inwards your receiver bean's PostConstruct annotated method, read the context parameter as well as educate the locale:

@PostConstruct populace void init() throws RuntimeException, IOException {  ExternalContext context = FacesContext.getCurrentInstance().getExternalContext();   Map requestParameters = context.getRequestParameterMap();   // educate locale  endeavor {   languageBean.setCurrentLocale(LocaleUtils.toLocale(requestParameters.get("locale")));  } choose handgrip of (IllegalArgumentException | NullPointerException e) {   languageBean.setCurrentLocale(Locale.JAPAN);   } } 

5.) For the initial page load, the offset fourth dimension a asking has been have y'all withdraw to manually reload the page for the locale to accept effect:

<script type="text/javascript">  window.onload = function() {   if (!window.location.hash) {    window.location = window.location + '#loaded';    window.location.reload();   }  } </script>