import java.net.*;
import java.io.*;

public class UDPClientDemo {
    private DatagramSocket s;
    private InetAddress hostAddress;
    private byte[] buf=new byte[1000];
    private DatagramPacket dp=new DatagramPacket(buf,buf.length);
    public UDPClientDemo(){
	try
	{
	    s=new DatagramSocket();
	    hostAddress=InetAddress.getByName("localhost");
	    System.out.println("Client start....");
	    while(true)
	    {
		String strOutMess="";
		BufferedReader stdin=new BufferedReader(new InputStreamReader(System.in));
		strOutMess=stdin.readLine();
		if(strOutMess.equals("bye")) break;
		String strOut="[Client say]:"+strOutMess;
		byte[]buf=strOut.getBytes();
		DatagramPacket out=new DatagramPacket(buf,buf.length,hostAddress,4200);
		s.send(out);
		s.receive(dp);
		String strReceived="("+dp.getAddress()+":"+dp.getPort()+")"+
		new String(dp.getData(),0,dp.getLength());
		System.out.println(strReceived);
	  }
	    
	}
	catch(UnknownHostException e)
	{
	    System.out.println("未找到服務器");
	    System.exit(1);
	}
	catch(SocketException se)
	{
	    System.out.println("打開套接字錯誤!");
	    se.printStackTrace();
	    System.exit(1);
	}
	
	    catch(IOException ie)
	    {
		System.err.println("IO error!");
	    }
	}
       /**
     * @param args
     */
    public static void main(String[] args) {
	// TODO Auto-generated method stub

    }

}