netty认知汇总

参考：https://www.jianshu.com/p/b9f3f6a16911

https://zhuanlan.zhihu.com/p/670553959

https://www.cnblogs.com/wuzhimao/p/17854524.html

https://www.cnblogs.com/sanshengshui/p/9741655.html（protobuf）