UDP socket

public class UdpTest  extends AbstractTests {

    @Test
    public void udpServer() throws IOException {
        DatagramSocket datagramSocket = new DatagramSocket(8888);
        byte[] data = new byte[1024];
        DatagramPacket datagramPacket = new DatagramPacket(data,data.length);
        System.out.println("服務器已經開啓，等待客戶端的連接");
        datagramSocket.receive(datagramPacket);
        String info = new String(data,0,datagramPacket.getLength());
        System.out.println(info);
        InetAddress inetAddress = datagramPacket.getAddress();
        int port=datagramPacket.getPort();

        byte[] data2 = "服務端進行反饋歡迎您".getBytes();
        DatagramPacket datagramPacket1 = new DatagramPacket(data2,data2.length,inetAddress,port);
        datagramSocket.send(datagramPacket1);
        datagramSocket.close();

    }

    @Test
    public void udpClient() throws IOException {
        InetAddress inetAddress = InetAddress.getByName("127.0.0.1");
        int port=8888;
        byte[] data = "我是客戶端 我的密碼是admin".getBytes();
        DatagramPacket datagramPacket = new DatagramPacket(data,data.length,inetAddress,port);
        DatagramSocket datagramSocket = new DatagramSocket();
        datagramSocket.send(datagramPacket);

        byte[] data1= new byte[1024];
        DatagramPacket datagramPacket1 = new DatagramPacket(data1,data1.length);
        datagramSocket.receive(datagramPacket1);
        String reply = new String(data1,0,datagramPacket1.getLength());
        System.out.println(reply);
        datagramSocket.close();
    }
}

UDP 循環接收數據

public class UdpTest001 extends AbstractTests {

    @Test
    public void udpServer() throws IOException {
        DatagramSocket datagramSocket = new DatagramSocket(8888);
        byte[] data = new byte[1024];
        DatagramPacket datagramPacket = new DatagramPacket(data, data.length);
        System.out.println("服務器已經開啓，等待客戶端的連接");
        while(true){
            datagramSocket.receive(datagramPacket);
            String info = new String(data, 0, datagramPacket.getLength());
            System.out.println(info);
        }

    }

    @Test
    public void udpClient() throws IOException {
        InetAddress inetAddress = InetAddress.getByName("127.0.0.1");
        int port = 8888;
        byte[] data = "我是客戶端 我的密碼是admin12".getBytes();
        DatagramPacket datagramPacket = new DatagramPacket(data, data.length, inetAddress, port);
        DatagramSocket datagramSocket = new DatagramSocket();
        datagramSocket.send(datagramPacket);
        datagramSocket.close();
    }
}