添加通知公告，给在线用户发送通知

       //添加一条通知公告，给在线用户发送通知
        ThreadPoolExecutor executor = new ThreadPoolExecutor(1,1,0, TimeUnit.MILLISECONDS,new LinkedBlockingDeque<>());
        executor.execute(new Runnable() {
            @Override
            public void run() {
                for (UserDO userDO : sessionService.listOnlineUser()) {
                    for (Long userId : userIds) {
                        if (userId.equals(userDO.getUserId())) {
                            template.convertAndSendToUser(userDO.toString(), "/queue/notifications", "新消息：" + notify.getTitle());
                        }
                    }
                }
            }
        });
        executor.shutdown();

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FR：徐海涛(hunk xu)

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