private String getProtocolFromExport() {
        String export = Optional.ofNullable(((BasicServiceConfigBean) applicationContext.getBean(BASE_SERVICE_CONFIG)).getExport()).orElse("");
        if (StringUtils.isNotEmpty(export) && export.contains(":")) {
            return export.split(":")[0];
        }
        return "motan2";
    }
Get the protocol from BasicServiceConfigBean export.
@return rpc protocol
shenyu-client/shenyu-client-motan/src/main/java/org/apache/shenyu/client/motan/MotanServiceEventListener.java