java 网络编程

public class Test {
    public static void main(String[] args) throws IOException {
        InetAddress address = InetAddress.getByName("10.9.6.56");
//        System.out.println(address.getHostName());
//        System.out.println(address.getHostAddress());
        DatagramSocket datagramSocket=new DatagramSocket();
        String msg="hello";
        byte[] bytes = msg.getBytes();
        DatagramPacket datagramPacket=new DatagramPacket(bytes,bytes.length,address,10086);
        datagramSocket.send(datagramPacket);
        datagramSocket.close();
    }
}

一台电脑接收数据

public class Test1 {
    public static void main(String[] args) throws IOException {
        DatagramSocket datagramSocket=new DatagramSocket(10086);
        byte[] bytes=new byte[1024];
        DatagramPacket datagramPacket=new DatagramPacket(bytes,bytes.length);
        datagramSocket.receive(datagramPacket);
        byte[] data = datagramPacket.getData();
        InetAddress address = datagramPacket.getAddress();
        int length = datagramPacket.getLength();
        System.out.println(new String(data,0,length));
        System.out.println(address.getHostAddress());
        datagramSocket.close();

    }
}

2.2 TCP

2.2.1 TCP简介

这部分内容摘自王道考研

TCP协议特点如下图：

TCP报文段是由TCP首部和TCP数据部分组成，TCP报文段首部格式如下图：

TCP三次握手如下图：

TCP连接释放四次握手如下图：

2.2.2 TCP实战

服务端代码如下;

public class Test {
    public static void main(String[] args) throws IOException {

        ServerSocket serverSocket=new ServerSocket(10086);
        Socket accept = serverSocket.accept();
        InputStream inputStream = accept.getInputStream();
        int b;
        while ((b=inputStream.read())!=-1){
            System.out.println((char)b);
        }
        inputStream.close();
        serverSocket.close();
    }
}

客户端代码如下：

public class Test1 {
    public static void main(String[] args) throws IOException {

        Socket socket=new Socket("10.9.6.56",10086);
        OutputStream outputStream = socket.getOutputStream();
        outputStream.write("hello".getBytes());
        outputStream.close();
        socket.close();
    }
}

文章由极客之音整理，本文链接：https://www.bmabk.com/index.php/post/196993.html