Java socket+BIO复习

socket概念：https://blog.youkuaiyun.com/a78270528/article/details/80318571

阻塞/非阻塞/同步/异步+socket：https://blog.youkuaiyun.com/qq_21125183/article/details/83831495

Java中BIO、NIO和AIO的区别和应用场景：https://blog.youkuaiyun.com/qq_24693837/article/details/70335491

https://blog.youkuaiyun.com/u010310183/article/details/81700405

BIO多线程实现：https://blog.youkuaiyun.com/Fly_Fly_Zhang/article/details/90451147