[网络协议]网络编程---TCP

TCP（用户传输协议）

客户端

1. 通过socket连接服务器
2. 发送消息

    public static void main(String[] args) throws Exception {

        Socket socket = null;
        OutputStream outputStream = null;

        try {

            InetAddress inet = InetAddress.getByName("127.0.0.1");
            socket = new Socket(inet,9999);
            outputStream = socket.getOutputStream();
            outputStream.write("Hello World！".getBytes());

        }catch (Exception e) {
            e.printStackTrace();

        }finally {
            outputStream.close();
            socket.close();
        }
    }

客户端：

1. 建立服务器端口ServerSocket
2. 等待用户的连接 accept
3. 接受用户的消息

 public static void main(String[] args) throws Exception {
        Socket accept = null;
        InputStream inputStream = null;
        ByteArrayOutputStream byteArrayOutputStream = null;
        try {

            ServerSocket serverSocket = new ServerSocket(9999);

            while (true) {

                accept = serverSocket.accept();
                inputStream = accept.getInputStream();
                byteArrayOutputStream = new ByteArrayOutputStream();
                byte[] bytes = new byte[1024];
                int len = 0;
                while((len = inputStream.read(bytes)) != -1) {
                    byteArrayOutputStream.write(bytes,0,len);
                }

                System.out.println(new String(byteArrayOutputStream.toString()));

            }

        }catch (Exception e) {
            e.printStackTrace();
        }finally {
            byteArrayOutputStream.close();
            inputStream.close();
            accept.close();
        }
    }

注意:以上代码都进行try catch处理，我是为了减少代码量，部分没有处理

知是行之始，行是知之成