How to implement session level localization in JSF instead of per request/view level selected locale memorization
P粉360266095
2023-08-22 21:30:42
<p><code>faces-config.xml</code>:</p>
<pre class="brush:php;toolbar:false;"><application>
<locale-config>
<default-locale>ru</default-locale>
<supported-locale>ua</supported-locale>
</locale-config>
</application></pre>
<p>In a bean action method, I change the locale of the current view as follows: </p>
<pre class="brush:php;toolbar:false;">FacesContext.getCurrentInstance().getViewRoot().setLocale(new Locale("ua"));</pre>
<p>The problem is that the <code>ua</code> locale only applies to requests/views, not sessions. Another request/view in the same session will reset the locale to the default <code>ru</code> value. </p>
<p>How do I apply a locale to a session? </p>
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I see that the problem is also related to the .properties file name. Java's Locale code (lowercase) such as: en_gb But the Locale automatically generated by Netbeans is lowercase_uppercase, for example: messages_en_GB.properties Change it to: messages_en_gb.properties Then it should work fine - if you've tried everything
You need to store the selected locale in session scope and set it in two places: once via
UIViewRoot#setLocale()Immediately after changing the locale (This will change the locale of the current view root so that it is reflected in subsequent requests; if you perform a redirect later, this part is unnecessary), and once in<f:view>in thelocaleattribute (this will set/preserve the locale on subsequent requests/views).Here is an example of how
LocaleBeanshould look:package com.example.faces; import java.util.Locale; import javax.faces.bean.ManagedBean; import javax.faces.bean.SessionScoped; import javax.faces.context.FacesContext; @ManagedBean @SessionScoped public class LocaleBean { private Locale locale; @PostConstruct public void init() { locale = FacesContext.getCurrentInstance().getExternalContext().getRequestLocale(); } public Locale getLocale() { return locale; } public String getLanguage() { return locale.getLanguage(); } public void setLanguage(String language) { locale = new Locale(language); FacesContext.getCurrentInstance().getViewRoot().setLocale(locale); } }This is an example of how the view should look:
<!DOCTYPE html> <html lang="#{localeBean.language}" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html"> <f:view locale="#{localeBean.locale}"> <h:head> <title>JSF/Facelets i18n 示例</title> </h:head> <h:body> <h:form> <h:selectOneMenu value="#{localeBean.language}" onchange="submit()"> <f:selectItem itemValue="en" itemLabel="English" /> <f:selectItem itemValue="nl" itemLabel="Nederlands" /> <f:selectItem itemValue="es" itemLabel="Español" /> </h:selectOneMenu> </h:form> <p><h:outputText value="#{text['some.text']}" /></p> </h:body> </f:view> </html>This assumes that
#{text}has been configured infaces-config.xmlas follows:<application> <resource-bundle> <base-name>com.example.i18n.text</base-name> <var>text</var> </resource-bundle> </application>Please note that
<html lang>is not required for JSF functionality, but is mandatory for search engine explanation pages. Otherwise, it may be marked as duplicate content, which is bad for SEO.See also: