BSD Socket 通信

Berkeley sockets is an application programming interface (API) for Internet sockets and Unix domain sockets, used for inter-process communication (IPC). 

BSD sockets cknowledging the first implementation in the Berkeley Software Distribution.

插座桥接应用层与传输层

----------Server--------

插排 ServerSocket ss = new ServerSocket(int port);

插口插线Socket s =  ss.accept();

插口拔线 s.close();

插排销毁 ss.close();

----------Client--------

插口插线 Socket s = new Socket(String host, int port);

插口拔线 s.cloes();

服务器插座的插口供多个客户端使用

一个端口对应一个服务器插座

通讯结束后需要拔掉插座，否则插口被占用