这是UDP网络编程的一个小程序,实现了TCPIP模型中无连接的传输协议-This is a small program of UDP network programming, implement the TCPIP model connectionless transport protocol

TCPIP 经典案例，三次握手，四次分手，握手协议，入门经典(The minute you think of giving up, think of the reason why you held on so long)