JSP定制标记中的i18n翻译 [英] i18n translation in JSP custom tag

问题描述

是否可以编写自定义JSP标记以获取i18n消息密钥并输出给定​​请求的翻译短语?

Is it possible to write a custom JSP tag to take an i18n message key and output the translation phrase for the given request?

通常在JSP/JSTL中，我会这样做:

Normally in JSP/JSTL, I do:

<fmt:message key="${messageKey}"><fmt:param>arg1</fmt:param></fmt:message>

然后我得到了翻译短语.现在，我需要执行以下操作(这样做有充分的理由):

And I get the translation phrase. Now I need to do the following (there's a good reason for this):

<custom:translate key="${messageKey}" arg="arg1"/>

但是我不知道如何在自定义标记代码中查找翻译. TagSupport基类提供了一个pageContext，从中可以获取一个具有Locale的ServletRequest……但是我该如何查找密钥的翻译?

But I don't know how to look up the translation in the custom tag code. The TagSupport base class provides a pageContext from which I can get a ServletRequest which has the Locale... but how do I then look up the translation for a key?

我使用Spring 3.0，并在我的application-context.xml中定义了ReloadableBundleMessageSource，因此可以调用:

I use Spring 3.0 and in my application-context.xml, I've defined a ReloadableBundleMessageSource so I can call:

messageSource.getMessage(
    key, new Object[] {arg}, pageContext.getRequest().getLocale()
);

但是我不认为我可以将messageSource注入到自定义标签中，可以吗?否则，我可以实例化一个新的实例，但是它会为每个调用加载成千上万的译文吗?我不想求助于使messageSource成为静态类的静态成员.

but I don't think I can inject messageSource into a custom tag, can I? Otherwise I can instantiate a new one, but would it load my tens of thousands of translations for every call? I don't want to resort to making messageSource a static member of a static class.

推荐答案

我不使用Spring，但是在普通" JSP中，您可以在Filter的帮助下将ResourceBundle实例放入会话范围或Servlet

I don't do Spring, but in "plain" JSP you can just put the ResourceBundle instance in the session scope with help of a Filter or Servlet

ResourceBundle bundle = ResourceBundle.getBundle(basename, request.getLocale());
request.getSession().setAttribute("bundle", bundle);

在JSP中将其像EL中的其他bean一样对待.

And treat it in JSP like any other bean in EL.

${bundle[messageKey]}

必须有Spring才能将其作为bean放入会话范围.

It must be possible to have Spring to put that as a bean in the session scope.

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