使用同步套接字服务器的主机解析,主机绑定,端口监听,很好(Using synchronization socket server host, the host binding, port to monitor, is very good)

服务端和客户端都必须建立通信套接字,而且服务端应先进入监听状态(All the server and the client must establish the communication socket, and the service side should look into the listening state)