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();
        }
    }
}