code: @Override
      public void contextInitialized(ServletContextEvent event) {
          // 根据配置的zealotConfig路径加载配置文件信息到缓存中
          String configClass = event.getServletContext().getInitParameter(CONFIG_CLASS);
          String xmlLocations = event.getServletContext().getInitParameter(XML_LOCATIONS);
          String handlerLocations = event.getServletContext().getInitParameter(HANDLER_LOCATIONS);
          ZealotConfigManager.getInstance().initLoad(configClass, xmlLocations, handlerLocations);
      }
docs: 应用服务器启动时执行.
  @param event 上下文事件对象