如何访问主文件和测试文件中的资源

Question

How to access resources(image/file) from main and test classes. If I directly give file name where will the resources be looked first for main classes and test classes.

My requirement: I need give a file in control folder as input to execute the jar file. And control file has file names(to access file in certificates folder) which I should access in my program.

How to give the file names in above scenarios.

Project structure is as follows Project Structure

Answer 1

If it is a image:

String path = "nameOfProject/resources/whateverfolder/imagename.png";
ImageIcon icon= new ImageIcon(getClass().getClassLoader().getResource(path));

It is donot matter which class you are in, if you pass whole path rather than file name.

To access a file:

ClassLoader classloader = Thread.currentThread().getContextClassLoader();
InputStream is = classloader.getResourceAsStream("test.txt");