为了让同学们更好的理解Socket的底层运作原理，Linux平台下只能使用底层库socket(socket.h)，Windows平台下只能使用Winsock(winsock.h)，请勿使用其它高层封装的Socket库（如Java库，MFC等）。-Linux platform in order to allow students to better understand the underlying principle of operation of the Socket can only use