在主函数中建立一个服务器套接字端口，等待客户机请求，一旦客户机请求被接受，服务器程序就建立一个服务器分线程，处理客户机的命令。-In the main function to create a server socket port, waiting for client requests, once the client request is accepted, the server program on the server to establish a sub-thread, deal wi