这是一个在许多论坛上都被问到的主题,但我找不到任何准确而具体的答案。在我看来,即使接受的答案也不完整,所以我将尝试发布我解决此问题的完整尝试,以期就该主题建立一个精确的问题+答案。
我正在尝试让资源包在 JSF 中工作。资源包来自一个 Spring bean,它应该从任意外部系统(即数据库)加载。
我现在将绕过数据库查询并使用模拟的资源包来保持清晰。
这是我的资源包业务实现,我设法从这个论坛的其他帖子中收集到:
public class TesteResBundle extends ReloadableResourceBundleMessageSource {
private final Map<String, Map<String, String>> properties = new HashMap<String, Map<String, String>>();
public TesteResBundle() {
reload();
}
@Override
protected MessageFormat resolveCode(String code, Locale locale) {
String msg = getText(code, locale);
MessageFormat result = createMessageFormat(msg, locale);
return result;
}
@Override
protected String resolveCodeWithoutArguments(String code, Locale locale) {
return getText(code, locale);
}
private String getText(String code, Locale locale) {
Map<String, String> localized = properties.get(code);
String textForCurrentLanguage = null;
if (localized != null) {
textForCurrentLanguage = localized.get(locale.getLanguage());
if (textForCurrentLanguage == null) {
textForCurrentLanguage = localized.get(Locale.ENGLISH.getLanguage());
}
}
return textForCurrentLanguage != null ? textForCurrentLanguage : code;
}
public void reload() {
properties.clear();
properties.putAll(loadTexts());
}
protected Map<String, Map<String, String>> loadTexts() {
Map<String, Map<String, String>> m = new HashMap<String, Map<String, String>>();
Map<String, String> v = new HashMap<String, String>();
v.put("en", "good");
v.put("pt", "bom");
v.put("en_US", "bom");
m.put("prop", v);
v = new HashMap<String, String>();
v.put("en", "bad");
v.put("pt", "mau");
v.put("en_US", "bom");
m.put("pror", v);
return m;
}
}
这是一个自定义的 EL 解析器,我也在论坛中找到了它。如果基础是 MessageSource 的实例,它会尝试收集消息。如果不是,它将解析传递给默认的 Spring EL 解析器:
public class MessageSourcePropertyResolver extends SpringBeanFacesELResolver {
public Object getValue(ELContext elContext, Object base, Object property)
throws ELException {
if (base instanceof MessageSource && property instanceof String) {
String result = ((MessageSource) base).getMessage(
(String) property, null, getLocale());
if (null != result) {
elContext.setPropertyResolved(true);
}
return result;
}
return super.getValue(elContext, base, property);
}
private Locale getLocale() {
FacesContext context = FacesContext.getCurrentInstance();
return context.getExternalContext().getRequestLocale();
}
}
自定义 EL 解析器在 faces-config.xml 中定义:
<el-resolver>pt.teste.pojo.MessageSourcePropertyResolver</el-resolver>
最后在 Spring 配置中,我将 messageSource bean 定义为:
<bean id="messageSource" class="pt.teste.pojo.TesteResBundle">
</bean>
我可以确认 messageSource bean 已正确实例化,并且 HashMap 在应用程序启动时已正确加载。我可以确认正在调用自定义处理程序并将所有不是资源消息且正确解析的 EL 传递给默认 Spring 解析器。
当我在 xhtml JSF 2.0 页面中使用资源包时,我是这样做的:
<h:outputText value="#{messageSource.prop}" />
在 EL 解析期间,自定义解析器正确地将基础检测为 MessageSource 实例,但在以下情况下失败:
String result = ((MessageSource) base).getMessage((String) property, null, getLocale());
除了以下情况:
org.springframework.context.NoSuchMessageException: No message found under code 'prop' for locale 'en_US'.
org.springframework.context.support.DelegatingMessageSource.getMessage(DelegatingMessageSource.java:65)
pt.teste.pojo.MessageSourcePropertyResolver.getValue(MessageSourcePropertyResolver.java:18)
com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
org.apache.el.parser.AstValue.getValue(AstValue.java:169)
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:189)
com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)
javax.faces.component.UIOutput.getValue(UIOutput.java:169)
com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:205)
com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:355)
com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:164)
javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:875)
com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:312)
com.sun.faces.renderkit.html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:105)
javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779)
com.sun.faces.renderkit.html_basic.CompositeRenderer.encodeChildren(CompositeRenderer.java:78)
javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779)
javax.faces.render.Renderer.encodeChildren(Renderer.java:168)
javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:845)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1782)
com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:402)
com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:125)
org.springframework.faces.webflow.FlowViewHandler.renderView(FlowViewHandler.java:99)
com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
org.springframework.faces.mvc.JsfView.renderMergedOutputModel(JsfView.java:85)
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262)
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1180)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:950)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
我认为我可能在这里遗漏了一些东西,特别是在 Spring 配置中的 messageSource bean 定义中。我怀疑这是因为在解析资源包时没有调用 TesteResBundle 的方法。
感谢您为此主题提供的任何帮助。