Netbeans - Wie kann externe Dateien in JAR File einbinden

package resources;
import java.util.logging.Logger;
import wpr.io.EnumFile;
import wpr.io.InternalFolders;


public class ResourceFile extends EnumFile {
    private static final Logger LOG = Logger.getLogger(ResourceFile.class.getName());
    
    public static final ResourceFile DATEI = new ResourceFile("datei.dll");  

        public ResourceFile(String file) {
        super(InternalFolders.Resources_Files.getPath(), file);
    }
}

private void extractResourceFiles() throws FileNotFoundException, IOException {
        byte buffer = new byte[1024];
        int nRead;
        
        FileOutputStream fos = null;
        InputStream is = null;
        
        fos = new FileOutputStream(ExternalFolders.TEMP_WPR_Service.getPath() + "datei.dll");  
        is = ResourceFile.DATEI.getStream();

        while ((nRead = is.read(buffer)) != 1) {
            fos.write(buffer, 0, nRead);
        }
        
        fos.close();
        is.close();