Servlet 相对于应用程序库的链接
我正在编写一个servlet（特别是使用Scalatra）。在 servlet 中，我在每个页面都包含的目录上有许多链接。我希望这些链接与应用程序库相关。如果我使用诸如“/foo”之类的链接，则当从根（localhost：8080 /）提供servlet时一切正常，但如果我从Jetty / Tomcat与其他servlet（localhost：8080 / servlet）一起提供它，则链接指向 servlet 外部。
对于这个问题有什么好的解决办法吗？
I am writing a servlet (specifically with Scalatra). In the servlet I have many links on a table of contents which is included with every page. I want these links to be relative to the application base. If I use links such as "/foo", everything works fine when the servlet is served from the root (localhost:8080/) but if I serve it from Jetty/Tomcat along with other servlets (localhost:8080/servlet) the link points outside of the servlet.
What is a good fix for this problem?
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您需要在链接 URL 前面添加域相对路径，包括通过
HttpServletRequest#getContextPath()。我不使用 Scala，所以我无法给出针对 Scala 的答案，但您可以在 JSP 中执行以下操作，以便图片清晰：当当前上下文路径为
/foo，那么上面的内容将以 HTML 形式结束，或者如果您在 servlet 类中使用 Java 以编程方式生成 HTML（这实际上是一种不好的做法，但除此之外）：
另一种方法是设置
You need to prepend the link URL with a domain-relative path including the context path as obtained by
HttpServletRequest#getContextPath(). I don't do Scala, so I can't give a Scala-targeted answer, but here's how you'd do it in JSP so that the picture is sound:When the current context path is
/foo, then the above will end up in HTML asOr if you're generating HTML programmatically using Java inside a servlet class (which is actually a poor practice, but that aside):
An alternative is to set the
<base>tag in HTML so that all relative links are relative to it, see also this answer for more detail: Browser can't access/find relative resources like CSS, images and links when calling a Servlet which forwards to a JSP