在 JSP 中包含的文件中输出重新格式化的文本

发布于 2024-08-30 20:53:44 字数 702 浏览 5 评论 0原文

我有一些 HTML 文件，我想通过标签将它们包含在我的 web 应用程序中。

在某些文件中，我有伪动态代码 - 特殊格式的文本位，在运行时，我希望将其解析为 MySQL 表中各自的数据位。

例如，HTML 文件可能包含一行内容：

Welcome, [username].

我希望将其解析为（通过登录用户的数据）：

Welcome, [email protected].

这在 JSP 文件中很容易实现，但要求规定这些文件将由人们创建他们了解基本的 HTML，但不了解 JSP。然而，像这样的简单文本标签应该很容易让我向他们解释。

我已经设置了代码来对字符串进行类似的解析，但是有人能想到一种跨文件执行此操作的方法吗？我实际上不需要修改磁盘上的文件 - 只需加载内容，修改它，然后将其输出到包含的 JSP 文件中。

我一直在尝试通过 apache readFileToString 将文件加载到字符串中，但我无法弄清楚如何从 webapp 内容目录中的特定文件夹加载文件而不将其硬编码在如果我将来部署到不同的系统，则必须担心它会损坏。

原文

I have a few HTML files that I'd like to include via tags in my webapp.

Within some of the files, I have pseudo-dynamic code - specially formatted bits of text that, at runtime, I'd like to be resolved to their respective bits of data in a MySQL table.

For instance, the HTML file might include a line that says:

Welcome, [username].

I want this resolved to (via a logged-in user's data):

Welcome, [email protected].

This would be simple to do in a JSP file, but requirements dictate that the files will be created by people who know basic HTML, but not JSP. Simple text-tags like this should be easy enough for me to explain to them, however.

I have the code set up to do resolutions like that for strings, but can anyone think of a way to do it across files? I don't actually need to modify the file on disk - just load the content, modify it, and output it w/in the containing JSP file.

I've been playing around with trying to load the files into strings via the apache readFileToString, but I can't figure out how to load files from a specific folder within the webapp's content directory without hardcoding it in and having to worry about it breaking if I deploy to a different system in the future.

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许久 2024-09-06 20:53:44

但我无法弄清楚如何从 web 应用程序内容目录中的特定文件夹加载文件，而无需对其进行硬编码，并且不必担心如果将来部署到不同的系统，它会被破坏。

如果这些文件位于 Web 内容中，请使用 ServletContext#getRealPath() 将相对 Web 路径转换为绝对磁盘文件系统路径。如果 WAR 在应用程序服务器中爆炸（大多数默认情况下这样做，只有 Weblogic 默认情况下不这样做，但这是可配置的 IIRC），则此方法有效。在 servlet 内部，您可以通过继承的 getServletContext() 方法。

String relativeWebappURL = "/html/file.html";
String absoluteFilePath = getServletContext().getRealPath(relativeWebappURL);
File file = new File(absoluteFilePath);
// ...

或者，您可以将其放在 Web 应用程序的类路径中并使用 ClassLoader#getResource()：

String relativeClasspathURL = "/html/file.html";
URL absoluteClasspathURL = Thread.currentThread().getContextClassLoader().getResource(relativeClasspathURL);
File file = new File(absoluteClasspathURL.toURI());
// ...

至于完整的情况，我怀疑您是否曾经考虑过像 < a href="http://freemarker.sourceforge.net/" rel="nofollow noreferrer">Freemarker 或速度来简化所有工作？

but I can't figure out how to load files from a specific folder within the webapp's content directory without hardcoding it in and having to worry about it breaking if I deploy to a different system in the future.

If those files are located in the webcontent, use ServletContext#getRealPath() to convert a relative web path to an absolute disk file system path. This works if the WAR is exploded in the appserver (most does it by default, only Weblogic doesn't do that by default, but this is configureable IIRC). Inside servlets you can obtain the ServletContext by the inherited getServletContext() method.

String relativeWebappURL = "/html/file.html";
String absoluteFilePath = getServletContext().getRealPath(relativeWebappURL);
File file = new File(absoluteFilePath);
// ...

Alternatively, you can put it in the classpath of the webapplication and make use of ClassLoader#getResource():

String relativeClasspathURL = "/html/file.html";
URL absoluteClasspathURL = Thread.currentThread().getContextClassLoader().getResource(relativeClasspathURL);
File file = new File(absoluteClasspathURL.toURI());
// ...

As to the complete picture, I question if you have ever considered an existing templating framework like Freemarker or Velocity to ease all the job?

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