Java三种IO模型和LinuxIO五种IO模型
Java:
https://github.com/Snailclimb/JavaGuide/blob/master/docs/java/BIO-NIO-AIO.md
https://github.com/CyC2018/CS-Notes/blob/master/notes/Java%20IO.md
Linux:
https://github.com/CyC2018/CS-Notes/blob/master/notes/Socket.md
理解Java三种IO模型，BIO就是操作系统提供的阻塞IO模型，NIO是IO复用模型，而AIO是异步IO模型
