spring - 如何在多个 ResourceBundles 之间共享与语言环境无关的属性？

Question

场景：在应用程序中，我有与语言相关的属性文件，它们用作模板来生成电子邮件：

email-subscription_en.properties：

email.subject=You are successfully subscribed to list {0}
email.body=...

email-cancellation_en.properties：

email.subject=You are successfully unsubscribed from list {0}
email.body=...

等等。现在在 Spring 上下文中，我想要这些包：

<bean id="subscriptionMailProperties" class="org.springframework.context.support.ResourceBundleMessageSource">
    <property name="basename" value="org.company.email-subscription" />
</bean>

<bean id="cancellationMailProperties" class="org.springframework.context.support.ResourceBundleMessageSource">
    <property name="basename" value="org.company.email-cancellation" />
</bean>

与我希望在上下文中声明的这些与语言无关的公共属性合并：

<util:properties id="commonMailProperties">
    <prop key="email.from">noreply@company.org</prop>
    <prop key="email.to">{0}@company.org</prop>
</util:properties>

这怎么可能？

Answer 1

据我所知，没有对此的支持。您正在尝试将配置与资源包混合。我觉得你现在拥有的是对的。如果您没有保持原样的奢侈，这里有一种方法（更多的黑客）

1. 使用“ commonMailProperties org.springframework.context.MessageSource”（java.util.Properties）作为依赖项来实现，并将 bean id 称为“commonMessageSource”。

2. In 'getMessage' implementations get the value from 'commonMailProperties'.

3. Inject 'commonMessageSource' to 'subscriptionMailProperties' and 'cancellationMailProperties', for 'parentMessageSource' property.

Answer 2

If somebody got interested in complete solution:

• Create class PropertiesMessageSource:

  /**
   * {@link org.springframework.context.MessageSource} implementation that resolves messages via underlying
   * {@link Properties}.
   */
  public class PropertiesMessageSource extends AbstractMessageSource {
  
      private Properties  properties;
  
      /**
       * Set properties to use.
       */
      public void setProperties(Properties properties) {
          this.properties = properties;
      }
  
      @Override
      protected MessageFormat resolveCode(String code, Locale locale) {
          String property = properties.getProperty(code);
  
          if (property == null) {
              return null;
          }
  
          return createMessageFormat(property, locale);
      }
  }
  

• Use it:

  <bean id="commonMailProperties" class="org.company.PropertiesMessageSource">
      <property name="properties">
          <props>
              <prop key="email.from">noreply@company.org</prop>
              <prop key="email.to">{0}@company.org</prop>
          </props>
      </property>
  </bean>
  <bean id="subscriptionMailProperties" class="org.springframework.context.support.ResourceBundleMessageSource">
      <property name="basename" value="org.company.email-subscription" />
      <property name="parentMessageSource">
          <ref bean="commonMailProperties"/>
      </property>
  </bean>
  

Answer 3

ResourceBundleMessageSource (more exactly: all descendants of AbstractMessageSource) now has commonMessages property which can hold locale-independent values. For example while you want to have mail subject and body locale-dependant, some properties (mail from and mail to) are common across all bundles (check SPR-10291):

<bean id="mailProperties" class="org.springframework.context.support.ResourceBundleMessageSource">
    <property name="basename" value="org.mycompany.email" />
    <property name="commonMessages">
        <props>
            <prop key="email.from">empty@mydomain.org</prop>
            <prop key="email.to">%s@mydomain.org</prop>
        </props>
    </property>
</bean>