Java网络编程——UDP实例

UDPSendDemo

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

public class UDPSendDemo
{

    /**
     * @param args
     */
    public static void main(String[] args)
    {
        DatagramSocket ds = null;
        try
        {
            ds = new DatagramSocket();
                BufferedReader br = new BufferedReader(new InputStreamReader(
                        System.in));

                String line = null;

                try
                {
                    while ((line = br.readLine()) != null)
                    {
                        byte[] buf = line.getBytes();
                        if (line.equals("quit"))
                            break;
                        DatagramPacket dp = new DatagramPacket(buf, buf.length,
                                InetAddress.getByName("192.168.0.101"), 8638);

                        ds.send(dp);

                    }
                    ds.close();

                } catch (IOException e)
                {
                    e.printStackTrace();
                }

        } catch (SocketException e)
        {
            e.printStackTrace();

        }

    }

}

UDPReceiveDemo：

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

public class UDPReceiveDemo
{
    public static void main(String[] args)
    {

        try
        {
            DatagramSocket ds = new DatagramSocket(8638);

            while (true)
            {
                byte[] buf = new byte[1024];

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

                try
                {
                    ds.receive(dp);
                    String ip = dp.getAddress().getHostAddress();
                    String data = new String(dp.getData(), 0, dp.getLength());

                    System.out.println(ip + ":: " + data);

                } catch (IOException e)
                {
                    e.printStackTrace();
                }

            }
        } catch (SocketException e)
        {
            e.printStackTrace();
        }
    }
}