在 JavaScript 中使用 JSP 代码 [英] Using JSP code in JavaScript

问题描述

我想在 JavaScript 中使用 JSTL 的 fmt 标记来本地化我的警报消息.我的 JavaScript 文件是一个独立文件，当我在 js 中包含 fmt 标签时，文件浏览器会给出 JavaScript 错误.是否可以使用 web.xml 配置将 .js 文件视为 .jsp 文件?任何人都可以请建议我该怎么做?

I want to use JSTL's fmt tag in JavaScript to localize my alert messages. My JavaScript file is a standalone file and when I include fmt tag in js, the file browser gives JavaScript errors. Is it possible to treat .js file as .jsp files using web.xml configuration? Can anyone please suggest how can I do that?

推荐答案

是否可以使用 web.xml 配置将 .js 文件视为 .jsp 文件?

is it possible to treat .js file as .jsp file using web.xml configuration?

是:

<servlet>
    <servlet-name>scriptjsp</servlet-name>
    <jsp-file>/script.jsp</jsp-file> 
</servlet>
<servlet-mapping>
    <servlet-name>scriptjsp</servlet-name>
    <url-pattern>/script.js</url-pattern>
</servlet-mapping>

但是，这样做并没有实际优势，因为 JavaScript 文件的 URL 不必以.js"结尾.决定文件是否为 JavaScript 文件的是它所提供的 MIME 媒体类型.您可以使用以下方法从 JSP 设置:

But, there is no actual advantage in doing this, because JavaScript files do not have to have URLs ending in ‘.js’. What determines whether a file is a JavaScript file is what MIME media type it is served as. You can set this from JSP using:

<%@ page contentType="text/javascript" %>

在顶部.然后你可以直接链接到:

at the top. Then you can link directly to:

<script type="text/javascript" src="/script.jsp"></script>

(另外:在当前的浏览器中，即使没有正确设置 Content-Type，与 <script> 标签链接的脚本也能工作，但这可能不值得依赖.)

(Aside: in current browsers, scripts linked to with the <script> tag will work even without having the Content-Type properly set, but that's probably not something to rely on.)

我想在javascript中使用JSTL的fmt标签

I want to use JSTL's fmt tag in javascript

这可能不是一个好主意.fmt 标签处理字符的 HTML 转义，但您想要的是 JavaScript 字符串文字转义，例如反斜杠转义引号字符.JSTL 不提供此功能.您的 JavaScript 字符串中会出现意外转义的&amp;"字符，并且在消息中使用撇号或双引号会破坏整个脚本.

This is probably not a good idea. The fmt tag deals with HTML-escaping for characters, but what you want is JavaScript string literal escaping, for example to backslash-escape quote characters. JSTL doesn't provide this capability. You'll get unexpectedly-escaped ‘&amp;’ characters showing up in your JavaScript strings, and use of apostrophe or double quote in messages will break the whole script.

此外，从 JSP 中提供通常包含的脚本可能会导致性能和缓存不佳.

Also, serving commonly-included scripts from JSP risks poor performance and cacheing.

我建议在 JavaScript 中使用独立的语言查找系统.例如，包括每个语言的外部脚本:

I'd suggest an independent language lookup system in JavaScript. For example, include a per-language external script:

<script type="text/javascript" src="/script/lang/en.js"></script>

(更改en"以匹配您想要的任何语言)，并在该文件中定义如下查找:

(changing 'en' to match whichever language you want), and in that file define a lookup like:

var msg= {
    messageName: 'Message in English',
    ...
};

然后在脚本中为每个可本地化的字符串查找 msg.messageName.

Then look up msg.messageName for each localisable string in the script.

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