How to Retrieve File Paths from the WAR/WEB-INF Folder in App Engine?

Retrieving File Paths from the WAR/WEB-INF Folder

In App Engine projects, accessing files stored within the WAR/WEB-INF folder requires a specific approach. This article explores two methods for constructing valid file paths to resources residing in this directory.

Method 1: Using getRealPath()

This method is applicable when the WAR file is expanded into a set of individual files at runtime. To obtain the full system path to the desired resource, employ the following code:

ServletContext context = getContext();
String fullPath = context.getRealPath("/WEB-INF/test/foo.txt");

Method 2: Using getResource()

This method is universally compatible with any Servlet Container, regardless of whether the WAR file is expanded. It provides access to the resource URL or input stream:

ServletContext context = getContext();
URL resourceUrl = context.getResource("/WEB-INF/test/foo.txt");

InputStream resourceContent = context.getResourceAsStream("/WEB-INF/test/foo.txt");

The getResource() approach is more versatile and reliable in all deployment scenarios.

Note on getContext()

The getContext() method is an implementation detail that needs to be provided within your application. In JSP pages, it is available as the context field, while in servlets, it can be retrieved from the ServletConfig passed during initialization.

By utilizing these techniques, developers can effectively access files stored in the WAR/WEB-INF directory, enabling them to handle various resource management tasks with ease.

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