netty网络通信demo，Netty是JBoss出品的高效的Java NIO开发框架，关于其使用，可参考我的另一篇文章 netty使用初步。本文将主要分析Netty实现方面的东西，由于精力有限，本人并没有对其源码做了极细致的研 究。如果下面的内容有错误或不严谨的地方，也请指正和谅解(Netty is an efficient Java NIO development framework developed by JBoss. For its use, I can refer to my other article, netty, for its initial use. This article will mainly analyze the Netty implementation of things, because the energy is limited, I did not make a very detailed study of its source code. If the following content is wrong or not rigorous, please also correct and understand)