1.dwr
内容正在建设中，研究中......
http://wangsf150.blog.163.com/blog/static/501495752012213101139444/
http://www.myexception.cn/program/667623.html
2.Comet4j
http://www.myexception.cn/software-architecture-design/1338860.html
3.pushlet
http://www.myexception.cn/software-architecture-design/1355023.html