UDP通信程序练习

package NetworkProgramming.UDP.Test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

/**
 * FileName: SendDemo
 * Author:   lps
 * Date:     2022/4/1 15:42
 * Sign:刘品水 Q：1944900433
 */
public class SendDemo {
    public static void main(String[] args) throws IOException {
        DatagramSocket ds = new DatagramSocket();
        InetAddress address = InetAddress.getByName("192.168.10.102");
        //DatagramPacket(byte[] buf, int length, InetAddress address, int port)
        //指定主机上的指定端口发送数据包的长度 length数据报包结构。

            //Scanner sc = new Scanner(System.in);
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
            String line;
            while ((line = br.readLine()) != null) {
                if ("886".equals(line)) {
                    break;
                }
                    byte[] bys = line.getBytes();
                    DatagramPacket dp = new DatagramPacket(bys, bys.length, address, 1944);
                    //SocketException
                    ds.send(dp);
            }
        ds.close();
//            byte[] bys = input.getBytes(StandardCharsets.UTF_8);
//            if ( input == String.valueOf(886)) {
//                System.exit(0);
//            } else {
//                DatagramPacket dp = new DatagramPacket(bys, bys.length, address, 1944);
//
//                ds.send(dp);
//
//            }

    }
}

package NetworkProgramming.UDP.Test;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;

/**
 * FileName: ReceiveDemo
 * Author:   lps
 * Date:     2022/4/1 15:42
 * Sign:刘品水 Q：1944900433
 */
public class ReceiveDemo {
    public static void main(String[] args) throws IOException {
        DatagramSocket ds = new DatagramSocket(1944);
        //DatagramSocket(int port)
        //构建一个数据报套接字绑定到本地主机的指定端口。
        while (true){

            //DatagramPacket(byte[] buf, int length)
            //接收数据包长度 length DatagramPacket构建。

            byte[] bys = new byte[1024];

            DatagramPacket dp = new DatagramPacket(bys, bys.length);


            //void receive(DatagramPacket p)
            //接收数据报包从这个插座。
            ds.receive(dp);
            //System.out.println(dp.toString());

            //解析数据包
            //byte[] getData()
            //返回数据缓冲区。
            byte[] data = dp.getData();
            //int getLength()
            //返回要发送的数据的长度或收到的数据的长度。
            int len = dp.getLength();
//        String dataString = new String(data,0,len);
//        System.out.print("数据是："+dataString);
            System.out.println("接收到的数据是：" + new String(data, 0, len));



        }

        //ds.close();

    }
}