java - SEAM localeSelector 未注入(inject)

Question

我正在使用 SEAM 2 的 LocaleSelector 在我的应用程序中设置可以正常工作的区域设置

我还使用 JAWR 的 i18n 消息生成器使消息可用作 Javascript 变量，按照说明 here我创建了一个类来解析当前区域设置，以便 JAWR 加载正确的消息包，这是我的代码

@Name("localeResolver")
public class LocaleResolver implements net.jawr.web.resource.bundle.locale.LocaleResolver {

    @In private LocaleSelector localeSelector;

    public LocaleResolver() {}

    @Override
    public String resolveLocaleCode(HttpServletRequest request) {
        if(localeSelector!=null){
            System.out.println("locale selector is not null setting jawr locale to "+localeSelector.getLocaleString());
            return localeSelector.getLocaleString();
        }else{
            System.out.println("locale selector is null setting jawr locale to "+request.getLocale().toString());
            return request.getLocale().toString();
        }   
    }
}

但是 localeSelector 始终为 null，因此它使用 request.getLocale 进行设置，这似乎是浏览器的默认区域设置(如果用户希望手动覆盖则不好)

为什么注入(inject)的 localeSelector 会为 null，我在其他组件中已经成功注入(inject)了？

谢谢

更新:web.xml 内容

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee      http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 <context-param>
  <param-name>facelets.DEVELOPMENT</param-name>
  <param-value>true</param-value>
 </context-param>
 <context-param>
  <param-name>javax.faces.DEFAULT_SUFFIX</param-name>
  <param-value>.xhtml</param-value>
 </context-param>
 <context-param>
  <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
  <param-value>server</param-value>
 </context-param>
 <context-param>
  <param-name>org.ajax4jsf.VIEW_HANDLERS</param-name>
  <param-value>com.sun.facelets.FaceletViewHandler</param-value>
 </context-param>
 <context-param>
  <param-name>org.jboss.jbossfaces.JSF_CONFIG_NAME</param-name>
  <param-value>Mojarra-1.2</param-value>
 </context-param>
 <context-param>
  <param-name>org.richfaces.SKIN</param-name>
  <param-value>plain</param-value>
 </context-param>
 <!-- Richfaces Global Ajax Que,
     added as getting concurrent conversation access exceptions
     from unknown locations -->
 <context-param>
  <param-name>org.richfaces.queue.global.enabled</param-name>
  <param-value>true</param-value>
 </context-param>

 <filter>
  <filter-name>Seam Filter</filter-name>
  <filter-class>org.jboss.seam.servlet.SeamFilter</filter-class>
 </filter>

 <!-- Seam -->
 <listener>
  <listener-class>org.jboss.seam.servlet.SeamListener</listener-class>
 </listener>
 <servlet>
  <servlet-name>Seam Resource Servlet</servlet-name>
  <servlet-class>org.jboss.seam.servlet.SeamResourceServlet</servlet-class>
 </servlet>
 <!-- JSF -->
 <servlet>
  <servlet-name>Document Store Servlet</servlet-name>
  <servlet-class>org.jboss.seam.document.DocumentStoreServlet</servlet-class>
 </servlet>
 <servlet>
  <servlet-name>Faces Servlet</servlet-name>
  <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
  <load-on-startup>1</load-on-startup>
 </servlet>
 <!-- jawr Servlet -->

 <servlet>
    <servlet-name>JavascriptServlet</servlet-name>
    <servlet-class>net.jawr.web.servlet.JawrServlet</servlet-class>

    <!-- Location in classpath of the config file -->
    <init-param>
        <param-name>configLocation</param-name>
        <param-value>/jawr.properties</param-value>
    </init-param>
    <init-param>
        <param-name>mapping</param-name>
        <param-value>/jsJawrPath/</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>JavascriptServlet</servlet-name>
    <url-pattern>/jsJawrPath/*</url-pattern>
</servlet-mapping>


 <!-- Store item Servlet -->
 <servlet-mapping>
  <servlet-name>Document Store Servlet</servlet-name>
  <url-pattern>*.csv</url-pattern>
 </servlet-mapping>
 <servlet-mapping>
  <servlet-name>Document Store Servlet</servlet-name>
  <url-pattern>*.xls</url-pattern>
 </servlet-mapping>
 <servlet-mapping>
  <servlet-name>Document Store Servlet</servlet-name>
  <url-pattern>*.pdf</url-pattern>
 </servlet-mapping>
 <servlet-mapping>
  <servlet-name>Faces Servlet</servlet-name>
  <url-pattern>*.xhtml</url-pattern>
 </servlet-mapping>
 <!-- 120 min session timeout -->
 <session-config>
  <session-timeout>120</session-timeout>
 </session-config>
 <!-- Mime types -->
 <mime-mapping>
  <extension>htc</extension>
  <mime-type>text/x-component</mime-type>
 </mime-mapping>
 <!-- Index file def -->
 <welcome-file-list>
  <welcome-file>index.xhtml</welcome-file>
 </welcome-file-list>
 <!-- Server error page -->
 <error-page>
  <error-code>500</error-code>
  <location>/error.xhtml</location>
 </error-page>
 <!-- File not found page -->
 <error-page>
  <error-code>404</error-code>
  <location>/resourceNotFound.xhtml</location>
 </error-page>
 <!-- Unathorised pages -->
 <error-page>
  <error-code>401</error-code>
  <location>/notAuthorised.xhtml</location>
 </error-page>
 <error-page>
  <error-code>403</error-code>
  <location>/index.xhtml</location>
 </error-page>
</web-app>

Answer 1

您的LocaleResolver作为单独 Servlet 请求的一部分进行调用，该请求不通过标准 JSF Servlet 进行路由。发生这种情况时，Seam 拦截器不会被触发，双射也不会发生。

要解决这个问题，您需要通知 Seam 有关传入请求的信息，以便它正确设置其上下文(请注意，您需要关闭生命周期，因此无法返回获得的值):

ServletLifecycle.beginRequest(request);
String locale = LocaleSelector.instance().getLocaleString();
ServletLifecycle.endRequest();
return locale;

或者，您可以使用提供的 ContextualHttpServletRequest类，它以更简洁的方式执行相同的操作(在 finally block 中关闭生命周期等):

final String[] locale = new String[1];
new ContextualHttpServletRequest(request) {
    @Override
    public void process() throws ServletException, IOException {
        // Do the things that need to access Seam contexts within this function:
        locale[0] = LocaleSelector.instance().getLocaleString();
    }
}.run();
return locale[0];