理解同步/异步，阻塞/非阻塞：https://juejin.im/entry/598da7d16fb9a03c42431ed3
2：http://qindongliang.iteye.com/blog/2018539
java nio和bio
转载于:https://www.cnblogs.com/vhyc/p/9161518.html
理解同步/异步，阻塞/非阻塞：https://juejin.im/entry/598da7d16fb9a03c42431ed3
2：http://qindongliang.iteye.com/blog/2018539
转载于:https://www.cnblogs.com/vhyc/p/9161518.html