Passe le nom de ton fichier bat en paramètre
public void executerCommande(String commande) throws IOException, InterruptedException
{
Process proc = Runtime.getRuntime().exec(commande);
InputStream istr = proc.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(istr));
String result;
while ((result = br.readLine()) != null)
setResultat(result);
proc.waitFor();
proc.destroy();
br.close();
}