Java 如何从 Web 存档的 WEB-INF 目录加载资源
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How to load a resource from WEB-INF directory of a web archive
提问by Michael Wiles
I have a web archive with a file placed in the WEB-INF directory.
我有一个 Web 存档，其中一个文件位于 WEB-INF 目录中。
How do I load that file in a java class?
如何在 java 类中加载该文件？
I know I can put it in the classes directory and load it from there. It would just be put it in WEB-INF.
我知道我可以将它放在 classes 目录中并从那里加载它。它只会放在 WEB-INF 中。
采纳答案by skaffman
Use the getResourceAsStream()method on the ServletContext object, e.g.
使用getResourceAsStream()ServletContext 对象上的方法，例如
servletContext.getResourceAsStream("/WEB-INF/myfile");
How you get a reference to the ServletContext depends on your application... do you want to do it from a Servlet or from a JSP?
您如何获得对 ServletContext 的引用取决于您的应用程序……您是想从 Servlet 还是从 JSP 中获得它？
EDITED: If you're inside a Servlet object, then call getServletContext(). If you're in JSP, use the predefined variable application.
编辑：如果您在 Servlet 对象中，则调用getServletContext(). 如果您使用的是 JSP，请使用预定义变量application。
回答by webcom
Here is how it works for me with no Servlet use.
这是它在不使用 Servlet 的情况下对我的工作方式。
Let's say I am trying to access web.xml in project/WebContent/WEB-INF/web.xml
假设我试图访问 project/WebContent/WEB-INF/web.xml 中的 web.xml
In project property Source-tab add source folder by pointing to the parent container for WEB-INF folder (in my case WebContent )
Now let's use class loader:
InputStream inStream = class.getClass().getClassLoader().getResourceAsStream("Web-INF/web.xml")
在项目属性 Source-tab 中，通过指向 WEB-INF 文件夹的父容器（在我的情况下为 WebContent ）添加源文件夹
现在让我们使用类加载器：
InputStream inStream = class.getClass().getClassLoader().getResourceAsStream("Web-INF/web.xml")
回答by Ted_Zactly
The problem I had accessing the sqlite db file I created in my java (jersey) server had solely to due with path. Some of the docs say the jdbc connect url should look like "jdbc:sqlite://path-to-file/sample.db". I thought the double-slash was part of a htt protocol-style path and would map properly when deployed, but in actuality, it's an absolute or relative path. So, when I placed the file at the root of the WebContent folder (tomcat project), a uri like this worked "jdbc:sqlite:sample.db".
我访问我在我的 java (jersey) 服务器中创建的 sqlite db 文件的问题完全与路径有关。一些文档说 jdbc 连接 url 应该看起来像“jdbc:sqlite://path-to-file/sample.db”。我认为双斜杠是 htt 协议样式路径的一部分，并且在部署时会正确映射，但实际上，它是绝对或相对路径。因此，当我将文件放在 WebContent 文件夹（tomcat 项目）的根目录时，像这样的 uri 可以工作“jdbc:sqlite:sample.db”。
The one thing that was throwing me was that when I was stepping through the debugger, I received a message that said "opening db: ... permission denied". I thought it was a matter of file system permissions or perhaps sql user permissions. After finding out that SQLite doesn't have the concept of roles/permissions like MySQL, etc, I did eventually change the file permissions before I came to what I believe was the correct solution, but I think it was just a bad message (i.e. permission denied, instead of File not found).
抛出我的一件事是，当我单步调试调试器时，我收到一条消息，上面写着“打开数据库：...权限被拒绝”。我认为这是文件系统权限或 sql 用户权限的问题。在发现 SQLite 没有像 MySQL 等角色/权限的概念后，我最终确实更改了文件权限，然后才找到我认为正确的解决方案，但我认为这只是一个坏消息（即权限被拒绝，而不是文件未找到）。
Hope this helps someone.
希望这可以帮助某人。
