getResourceAsStream

ScriptEngineManager engineMgr = new ScriptEngineManager();
  ScriptEngine engine = engineMgr.getEngineByName("ECMAScript");
  InputStream is = 
      this.getClass().getResourceAsStream("/scripts/F1.js");
  try {
    Reader reader = new InputStreamReader(is);
    engine.eval(reader);
  } catch (ScriptException ex) {
    ex.printStackTrace();
  }