Spring 如何在多个ResourceBundle之间共享与区域设置无关的属性？

场景：在应用程序中，我有语言相关的属性文件，这些文件用作生成电子邮件的模板：

电子邮件订阅\u en.properties

：

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

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

电子邮件取消\u en.属性

：

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

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

等等。现在，在Spring环境中，我希望有以下捆绑包：

<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公共语言独立属性合并：

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

noreply@company.org
{0}@company.org

---

怎么可能呢？

据我所知，这一点不受支持。您正在尝试将配置与资源包混合使用。我觉得你现在拥有的是正确的。如果你没有保持现状的奢侈，这里有一个方法（更像是一个黑客）

实现

org.springframework.context.MessageSource

，将“commonMailProperties”（java.util.Properties）作为依赖项，并将bean id称为“commonMessageSource”

在“getMessage”实现中，从“commonMailProperties”获取值

将“commonMessageSource”注入到“subscriptionMailProperties”和“cancellationMailProperties”的“parentMessageSource”属性中

---

如果有人对完整的解决方案感兴趣：

• 创建类

  属性消息源

  ：

  /**
   * {@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);
      }
  }
  

• 使用它：

  <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>
  

  
  noreply@company.org
  {0}@company.org
  

---

ResourceBundleMessageSource

（更确切地说：所有

AbstractMessageSource

的后代）现在都有

commonMessages

属性，该属性可以保存与区域设置无关的值。例如，虽然您希望邮件主题和正文区域设置依赖，但某些属性（邮件发件人和邮件收件人）在所有捆绑包中都是通用的（请检查）：

empty@mydomain.org
%s@mydomain.org