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import java.io.IOException;import java.net.*;public class UDPServer {	public static final int LocalPort = 3000;	public static final int RemotePort = 9000;		public static void main(String[] args) {		// TODO Auto-generated method stub		String str_send = "I am Server!";		byte[] buf = new byte[1024];		DatagramSocket dp_recvSock = null;		InetAddress localAddress = null;		InetAddress remoteAddress = null;				//���������socket		try {			dp_recvSock = new DatagramSocket(LocalPort);		} catch (SocketException e) {			// TODO Auto-generated catch block			e.printStackTrace();		}				try {			localAddress = InetAddress.getLocalHost();		} catch (UnknownHostException e1) {			// TODO Auto-generated catch block			e1.printStackTrace();		}		remoteAddress = localAddress;				//�������ջ�����		DatagramPacket dp_recv = new  DatagramPacket(buf,1024);				System.out.println("Server is on,wating for client...");		boolean isRunning = true;		//ѭ���н���client����Ϣ��������Ӧ��		while(isRunning)		{			try {				dp_recvSock.receive(dp_recv);			} catch (IOException e) {				// TODO Auto-generated catch block				e.printStackTrace();			}						//��ӡ�յ�����Ϣ			System.out.println("Recv:\r\n"+new String(dp_recv.getData()));						//����Ϣ��client			DatagramPacket dp_send = new DatagramPacket(str_send.getBytes(), str_send.length(),remoteAddress,RemotePort);			try {				dp_recvSock.send(dp_send);				isRunning = false;			} catch (IOException e) {				// TODO Auto-generated catch block				e.printStackTrace();			}		}		dp_recvSock.close();	}}

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