JSF 中的本地化，如何记住每个会话而不是每个请求/视图选择的语言环境 [英] Localization in JSF, how to remember selected locale per session instead of per request/view
问题描述
faces-config.xml:
<application>
<locale-config>
<default-locale>ru</default-locale>
<supported-locale>ua</supported-locale>
</locale-config>
</application>
在 bean 操作方法中，我正在按如下方式更改当前视图中的语言环境:
In a bean action method, I'm changing the locale in the current view as follows:
FacesContext.getCurrentInstance().getViewRoot().setLocale(new Locale("ua"));
问题是应用了 ua 区域设置，但仅针对每个请求/视图而不是针对会话.同一会话中的另一个请求/视图将区域设置重置为默认的 ru 值.
The problem is that ua Locale is applied, but only per request/view and not for session. Another request/view within the same session resets the locale back to default ru value.
如何为会话应用语言环境?
How can I apply the locale for session?
推荐答案
需要将选中的 locale 存储在 session scope 中，并在 viewroot 中的两个地方设置: once by UIViewRoot#setLocale() 更改区域设置后立即(更改当前视图根的区域设置，从而反映在回发中；此后执行重定向时不需要这部分)，并且在 locale 中一次的属性f:view>(在后续请求/视图中设置/保留区域设置).
You need to store the selected locale in the session scope and set it in the viewroot in two places: once by UIViewRoot#setLocale() immediately after changing the locale (which changes the locale of the current viewroot and thus get reflected in the postback; this part is not necessary when you perform a redirect afterwards) and once in the locale attribute of the <f:view> (which sets/retains the locale in the subsequent requests/views).
下面是一个 LocaleBean 应该是什么样子的例子:
Here's an example how such a LocaleBean should look like:
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);
}
}
下面是一个视图示例:
<!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 example</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>
请注意， 不是 JSF 运行所必需的，但搜索机器人如何解释您的页面是强制性的.否则可能会被标记为重复内容，这对 SEO 不利.
Note that <html lang> is not required for functioning of JSF, but it's mandatory how search bots interpret your page. Otherwise it would possibly be marked as duplicate content which is bad for SEO.
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