Socket有两种类型：1、TCP套接字 2、UDP套接字

服务端socket

    ServerSocket sever = new ServerSocket(port);

    Socket socket = sever.accept();

    BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

    BufferedWriter out = new BufferedWriter(new OutputStreamWriter(socket.getOutPutStream()));

    out.write();

    out.flush();

    socket.close();

客户端socket

     Socket socket = new Socket("localhost","8080");

     socket.getInputStream();

     socekt.getOutPutStream();

     out.write();

     out.flush();

     socket.close();