简体繁体 English

HTML Web应用程序通知系统

[英]HTML Web Application Notification System

原文 2014-06-02 20:16:32 5 1 java/ javascript/ ajax/ web/ notifications

I'm using Play Framework 2.3 (Java) and MySQL. 我正在使用Play Framework 2.3（Java）和MySQL。

I'm building a notification system that reads from a "notifications" table in MySQL. 我正在构建一个从MySQL中的“ notifications”表读取的通知系统。

I've tried using AJAX polling where a request is sent asynchronously every 30 seconds, the table is read and if any new notifications exist, are sent via JSON back to the client. 我尝试使用AJAX轮询，其中每30秒异步发送一次请求，读取表，如果存在任何新通知，则通过JSON发送回客户端。 However, the performance is concerning, especially with many concurrent users. 但是，性能令人担忧，尤其是对于许多并发用户。

What's the best way to build such a system? 构建这样的系统的最佳方法是什么？ Are there any particular Java libraries that would work well for this? 是否有任何特定的Java库对此适用？

Thanks in advance. 提前致谢。

1 个解决方案

I see I read too fast, you're using the Play Framework, which I don't know. 我看得太快了，您正在使用Play框架，但我不知道。 But a quick search reveals that it also has websocket capabilities: 但是快速搜索发现它也具有websocket功能：

http://www.playframework.com/documentation/2.3.x/JavaWebSockets http://www.playframework.com/documentation/2.3.x/JavaWebSockets

---- Old answer below ---- ----下面的旧答案----

If you're using JEE7, why not try to use websockets? 如果您使用的是JEE7，为什么不尝试使用websocket？ It would limit your application to 'newer' browsers, supporting websockets, but it would improve performance, since the connection is bi-directional and suffers less from overhead. 它将您的应用程序限制为支持Websocket的“较新”浏览器，但由于连接是双向的并且开销较小，因此可以提高性能。

More information on the subject can be found here: 有关此主题的更多信息，请参见：

http://docs.oracle.com/javaee/7/tutorial/doc/websocket.htm http://docs.oracle.com/javaee/7/tutorial/doc/websocket.htm

I've also found the following example very useful: 我还发现以下示例非常有用：

http://mgreau.com/posts/2013/11/11/javaee7-websocket-angularjs-wildfly.html http://mgreau.com/posts/2013/11/11/javaee7-websocket-angularjs-wildfly.html