https://blog.toright.com/posts/569/dwr-direct-web-remoting-%e7%a0%94%e7%a9%b6%e8%88%87%e5%af%a6%e4%bd%9c%e6%95%99%e5%ad%b8%e6%96%87%e4%bb%b6
DWR, Direct Web Remoting 研究與實作教學文件