https://github.com/fuzhengwei/javase_netty
http://www.open-open.com/lib/view/open1403057331075.html
http://www.infoq.com/cn/articles/netty-threading-model?utm_source=infoq&utm_medium=popular_links_homepage
http://my.oschina.net/waylau/blog/392441
原文：http://my.oschina.net/zhangjie830621/blog/395713