一对控制台下的TCP通信程序的客户端和服务器端，然后双方要能够相互发送和反馈信息进行无限次连续通信，直到其中一方发送表示结束通信的“end”字符串，然后接收方也返回一个“end”，双方结束通信-A pair of TCP communication procedure under the console client and server side, and then the two sides and to be able to send each other an unlimited continuous feedback communication, until the end of one of the parties to send communications that " end"　string, then the receiver can return an " end" , both sides to end communication