java的udp程序异常

Question

//数据接收端
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class Father {
    public static void main(String[] args) throws IOException {
        while(true){
            DatagramSocket datagramSocket = new DatagramSocket(54645);
            byte[] bys=new byte[1024];
            DatagramPacket datagramPacket = new DatagramPacket(bys, bys.length);
            datagramSocket.receive(datagramPacket);
            System.out.println("接收到的数据是："+new String(datagramPacket.getData(),0,datagramPacket.getLength()));
        }

    }
    /*public void eat()throws FatException{}*/
}
//数据发送端
public Daughter{ public static void main(String[] args) throws IOException, ParseException, ClassNotFoundException {
        DatagramSocket datagramSocket = new DatagramSocket();
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in),1024);
        String line;
        while((line=bufferedReader.readLine())!=null)
        {
            if("886".equals(line))
            {
                break;
            }
            byte[] bys=line.getBytes();
            DatagramPacket datagramPacket = new DatagramPacket(bys, bys.length, InetAddress.getByName("10.40.193.31"), 54645);
            datagramSocket.send(datagramPacket);
        }
        datagramSocket.close();
}
}

接收端只能接受一个数据，然后就会抛出BindException 我改了端口号还是不行

Answer 1

你这行每次都去创建一个新连接(之前的端口还没有释放，再次创建肯定端口占用)，肯定是端口占用，你得创建一个长链接，比如在while之前创建连接