[网络协议]Java网络编程---UDP聊天实现

• 发送方

public class UdpSendDemo {
    public static void main(String[] args) throws Exception{
            //1.建立一个socket
            DatagramSocket datagramSocket = new DatagramSocket(888);
            while (true){
                //2.准备数据,从控制台获取
                BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
                String read = reader.readLine();
                byte[] data = read.getBytes();
                //3.打包发送
                DatagramPacket packet = new DatagramPacket(data,0,data.length,new InetSocketAddress("localhost",666));
                datagramSocket.send(packet);
                //4.退出对话
                if (read.equals("退出")){break;}

            }
                //5.关闭
                datagramSocket.close();


    }
}

• 接收方

public class UdpReceiveDemo {
    public static void main(String[] args) throws Exception{
        //1.建立一个socket
        DatagramSocket socket = new DatagramSocket(666);
        while (true){
        //2.准备接收包裹
        byte[] bytes = new byte[1024];
        DatagramPacket packet = new DatagramPacket(bytes,0,bytes.length);
        socket.receive(packet);
        //3.读取包裹
        byte[] data = packet.getData();
        String data0 = new String(data,0,data.length);
        System.out.println(data0);
        //4.退出聊天
            if (data0.equals("退出")){
                break;}
            }
        //5.关闭
        socket.close();




}}