一个简单网络通信系统，实现通信双方的消息收发，主要包括服务器和客户机的设计。实现客户端接收键盘输入的字符串，并向服务器发送；服务器接收后，将字符串以逆序返回给客户端； 客户端显示服务器返回的逆序字符串。TCP的.-A simple network communication system, communication between the two sides to send and receive messages, including server and client design. Realize the client to receive keyboard input string to the server　server receives, it will reverse the string to return to the client　client shows the server returned to the reverse string. TCP