如何使用Java知道web容器的路径? [英] how to know the path of the webcontainer using java?

问题描述

我需要使用java获取Web容器路径，对此有什么方法吗?我需要通过JSP或Servlet使用它来获取文件路径.

I need to get the web container path using java, is there any method for that? I need to use it using JSP or Servlet to get a file path.

推荐答案

我需要通过JSP或Servlet使用它来获取文件路径.

那么该文件存储在WAR的公共Web内容中吗?使用 ServletContext#getRealPath() .

So the file is stored in the public webcontent of the WAR? Use ServletContext#getRealPath().

String relativeWebPath = "/file.jpg";
String absoluteDiskPath = getServletContext().getRealPath(relativeWebPath);
File file = new File(absoluteDiskPath);
InputStream input = new FileInputStream(file); // I guess this is what you want.
// ...

请注意，这仅在容器扩展WAR时有效.否则，最好使用 ServletContext#getResourceAsStream() ，如果您真正想要的只是得到它的InputStream.

Note that this only works when the WAR is expanded by the container. Otherwise better use ServletContext#getResourceAsStream() if all you really want is to get an InputStream of it.

String relativeWebPath = "/file.jpg";
InputStream input = getServletContext().getResourceAsStream(relativeWebPath);
// ...

另请参见:

• getResourceAsStream()vs FileInputStream

See also:

• getResourceAsStream() vs FileInputStream

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