read text file from resources folder

readFile.java

 public String readFile(String filename) {
        String content = "";
        try {
            // read filename from resources folder
            URL fileURL = getClass().getResource(filename);
            content = new String ( Files.readAllBytes( Paths.get( fileURL.getFile() ) ) );
        }
        catch (IOException e) {
            e.printStackTrace();
        }
        return content;
    }