resource getinputstream

`getResourceAsStream` is a method in Java that allows you to obtain an `InputStream` object from a file or resource located in your project's classpath. This is often used when you want to read data from a file that is bundled with your application.

Here's an example that demonstrates how to use `getResourceAsStream` to obtain an `InputStream` from a file named `example.txt` that is located in the root directory of your project's classpath:

InputStream inputStream = getClass().getResourceAsStream("/example.txt");

Note that the path to the resource is relative to the root directory of your project's classpath and must start with a forward slash (`/`).