在 Tomcat 中为单个目录配置符号链接 [英] Configure Symlinks for single directory in Tomcat

问题描述

我有一个目录，进程将一些 .pdf 文件上传到该目录.这个过程是我无法控制的.

我需要使用 Tomcat 通过网站提供这些文件.

我有一个目录 /var/lib/tomcat5/webapps/test1 可用于网络，我可以使用浏览器查看其中的文件.

因此，我创建了一个符号链接，指向带有 .pdf 文件的目录:/var/lib/tomcat5/webapps/test1/files/，但我在该目录中看不到任何内容.

如何仅在 test1 目录中启用符号链接?我不想在任何地方启用符号链接，只是为了让带有 .pdf 文件的目录可供网络使用.

解决方案

创建包含 <Context 的 META-INF/context.xml 的解决方案存在一些问题path="/myapp" allowLinking="true">

最大的问题是，如果conf/context.xml存在，中的allowLinking需要优先于 在 META-INF/context.xml 中.如果 conf/context.xml 中没有明确定义 allowLinking，那就和说 allowLinking="false" 一样.(请参阅我对上下文优先级问题的回答)>

要确保您的应用允许链接，您必须说<Context override="true" allowLinking="true" ...>.

另一个问题是在 META-INF/context.xml 中忽略了 path="/myapp".为避免混淆，最好将其排除在外. 中唯一的 path 有任何影响是在 server.xml 和 官方 Tomcat 文档建议不要 将 放在一个server.xml.

最后，我建议使用 conf/Catalina/localhost/myapp.xml 文件而不是 myapp/META-INF/context.xml 文件.这种技术意味着您可以保持 META-INF 的内容干净，这是您的 web 应用程序的内脏——我不想冒险在我的 web 应用程序内脏.:-)

I have a directory to which a process uploads some .pdf files. This process is out of my control.

I need to make those files available through the website using Tomcat.

I have a directory /var/lib/tomcat5/webapps/test1 available to the web and I can see the files in it with a browser.

So, I created a symbolic link pointing at the directory with the .pdf files: /var/lib/tomcat5/webapps/test1/files/, but I can't see anything in that directory.

How can I enable symlinks in the test1 directory only? I don't want to enable symlinks everywhere, just so that directory with .pdf files is available to the web.

解决方案

There are a few problems with the solution of creating a META-INF/context.xml that contains <Context path="/myapp" allowLinking="true">

The biggest issue is that if a conf/context.xml exists, the allowLinking in the <Context> there takes precedence over a <Context> in a META-INF/context.xml. And if the in the conf/context.xml does not explicitly define allowLinking, that's the same as saying allowLinking="false". (see my answer to a context precedence question)

To be sure that your app allows linking, you have to say <Context override="true" allowLinking="true" ...>.

Another issue is that the path="/myapp" is ignored in a META-INF/context.xml. To prevent confusion, it's best to leave it out. The only time path in a <Context> has any effect is in the server.xml, and the official Tomcat docs recommend against putting <Context>s in a server.xml.

Finally, instead of a myapp/META-INF/context.xml file, I recommend using a conf/Catalina/localhost/myapp.xml file. This technique means you can keep the contents of your META-INF clean, which is the guts of your webapp -- I don't like to risk mucking about in the guts of my webapp. :-)

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