Time: 2024-04-10 16:32:26
Author: Jackasher

UDP

UDP是无连接的,所以可以实现聊天,并且不需要数据库,分为发送方和接收方

接收方不需要制定发送方的端口和ip,但发送方需要明确对方地址

//发送方演示
Scanner scanner = new Scanner(System.in);
                DatagramSocket socket = new DatagramSocket(8888);
                
                //由于电脑传输是二进制,所以需要转化为二进制
                String msg;
                msg = scanner.next();
                byte[] bytes = msg.getBytes();

                //然后封装上传数据,并制定端口
                DatagramPacket packet = new DatagramPacket(bytes, 0, bytes.length, new InetSocketAddress("localhost", 9999));

                //发生数据
                socket.send(packet);

                //关闭
                socket.close();

//接收方演示
DatagramSocket socket = new DatagramSocket(9999);

            //字节准备
            byte[] bytes  = new byte[1026];

            //准备包接受数据
            DatagramPacket packet = new DatagramPacket(bytes, 0, bytes.length);

            //接受数据到packet
            socket.receive(packet);

            //获取接受数据
            byte[] data = packet.getData();

            //转化为字符串
            String s = new String(data,0,packet.getLength());

            //关闭
            socket.close();