public interface ResourceLoader {
    String CLASSPATH_URL_PREFIX = "classpath:";

    Resource getResource(String var1);

    @Nullable
    ClassLoader getClassLoader();
}

@Component
public class AppRunner implements ApplicationRunner {
    @Autowired
    private ResourceLoader resourceLoader;

    @Override
    public void run(ApplicationArguments args) throws Exception {
        Resource resource = resourceLoader.getResource("classpath:test.txt");
        System.out.println(resource.exists());
        System.out.println(resource.getDescription());
        System.out.println(resource.contentLength());
        System.out.println(resource.getFilename());
        System.out.println(resource.getURI());
    }
}

//result
true
class path resource [test.txt]
11
test.txt
file:/Users/jaeyeonkim/Desktop/spring-inflearn/target/classes/test.txt