@Override
 protected void destory(int arg) {
   servletFilterBridgeServiceRegistration.unregister();
   // 停止时,保存相关运行时状态到ServletContext中。
   WebContext.getServletContext()
       .setAttribute(QUICKWEBFRAMEWORK_STATE_FILTERCONFIG, getFilterConfig());
 }
  @Override
  protected void init(int arg) {
    BundleContext bundleContext = Activator.getContext();

    // 启动时,从ServletContext中读取相关运行时状态
    Object filterConfigObject =
        WebContext.getServletContext().getAttribute(QUICKWEBFRAMEWORK_STATE_FILTERCONFIG);
    if (filterConfigObject != null) setFilterConfig((FilterConfig) filterConfigObject);

    // 注册过滤器桥接对象
    servletFilterBridgeServiceRegistration =
        bundleContext.registerService(
            ServletFilterBridge.class.getName(), new ServletFilterBridge(), null);
  }