Struts中如何包含多个消息资源？
我正在使用（学习...）Struts 1.3 来构建 MVC Web 应用程序。为了清楚起见，我想包含多个
官方 Apache 文档 指出：
您可以为您的网络应用定义一个或多个
元素；模块可以定义自己的资源包。不同的包可以在您的应用程序中同时使用，'key'属性用于指定所需的包。
但是，当我包含多个元素时，JSP 会引发异常，指出缺少键消息：
SEVERE: Servlet.service() for servlet jsp threw exception javax.servlet.jsp.JspException: Missing message for key "label.username" in bundle "(default bundle)" for locale en_GB
at org.apache.struts.taglib.bean.MessageTag.doStartTag(MessageTag.java:233)
at org.apache.jsp.index_jsp._jspx_meth_bean_005fmessage_005f0(index_jsp.java:197)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:107) ~~~snip~~~
这是 XML：
<struts-config>
~~~snip~~~
<message-resources parameter="resources.DefaultResource"/>
<message-resources parameter="resources.Registration"/>
</struts-config>
如果没有第二个“注册”资源，则不会引发异常。 “label.username”仅存在于“DefaultResource”中。
非常感谢。
I'm using (learning...) Struts 1.3 to build an MVC web application. For clarity, I'd like to include more than one <message-resources> element - separating the messages into files for specific modules of the application.
The official Apache documentation states:
You can define one or more
<message-resources>elements for your webapp; modules can define their own resource bundles. Different bundles can be used simultaneously in your application, the 'key' attribute is used to specify the desired bundle.
However, when I include more than one element, JSP's cause an exception stating that there is a missing message for key:
SEVERE: Servlet.service() for servlet jsp threw exception javax.servlet.jsp.JspException: Missing message for key "label.username" in bundle "(default bundle)" for locale en_GB
at org.apache.struts.taglib.bean.MessageTag.doStartTag(MessageTag.java:233)
at org.apache.jsp.index_jsp._jspx_meth_bean_005fmessage_005f0(index_jsp.java:197)
at org.apache.jsp.index_jsp._jspService(index_jsp.java:107) ~~~snip~~~
This is the XML:
<struts-config>
~~~snip~~~
<message-resources parameter="resources.DefaultResource"/>
<message-resources parameter="resources.Registration"/>
</struts-config>
Without the second "Registration" resource, the exception isn't thrown. "label.username" exists in the "DefaultResource" only.
Many thanks.
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使用此 struts-config，第二个消息资源元素使用与第一个消息资源元素相同的（默认）密钥，从而完全替换第一个消息资源元素。您必须为每个捆绑包分配不同的密钥，并在 bean:message 标记中使用捆绑包属性来指示要使用哪个捆绑包：
并在 JSP 中使用：
With this struts-config, the second message resources element uses the same (default) key as the first one, and thus replaces the first one completely. You must assign a different key to each of the bundle, and use the bundle atttribute in the bean:message tag to indicate which bundle you want to use :
and in the JSPs :
我相信您需要提供关键属性。该键应该用在 jsp 中的标记中，以显示资源属性文件中的特定消息。看看这个教程。
I believe you need to provide the key attribute. The key should be used in tag in jsp to display particular message from the resource property file. Take a look at this tutorial.
答案就在您问题中包含的文档片段中。
如果您有多个捆绑包，
http://struts.apache.org/1.3.10/struts-core/dtddoc/struts-config_1_3.dtd.html #message-resources
在 struts-config 中包含一个键属性（具有唯一值）以及参数属性。如果没有不同的密钥，则 resources.Registration 会覆盖 resources.DefaultResource
（为了测试这个假设，请在 struts-config 中切换两个消息资源的顺序。然后，您的 label.username 将起作用，但来自其他包的消息将不起作用）
The answer is right there in the documentation snippet you included in your question.
if you have more than one bundle,
http://struts.apache.org/1.3.10/struts-core/dtddoc/struts-config_1_3.dtd.html#message-resources
Include a key attribute (with unique values) along with the parameter attribute in your struts-config. without a distinct key, resources.Registration is overwriting resources.DefaultResource
(To test this assumption, switch the ordering of two message-resources in struts-config. Then, your label.username will work but messages from the other bundle won't)