/**
 *UDPClient
 *@author Winty wintys@gmail.com
 *@version 2008-12-15
 */
import java.io.*;
import java.net.*;
class UDPClient{
	public static void main(String[] args)throws IOException{
		//DatagramSocket client = new DatagramSocket();
		//DatagramSocket client = new DatagramSocket(8000);


		String ser_addr = "www.dachengkeji.com.cn";
		int ser_port = 5050;
		int cli_port = 8000;
		String sendStr = "Hello! I'm Client";

		int argc = args.length;
		int i = 0;

		while (i < argc)
		{
			System.out.printf("args[%d]:[%s]\n",i,args[i]);
			if (args[i].equals("-s") && argc >= i + 1)
			{
				ser_addr = args[i + 1];
				i = i + 2;
				continue;
			}
			else if (args[i].equals("-sp") && argc >= i + 1)
			{
				ser_port = Integer.parseInt(args[i + 1]);
				i = i + 2;
				continue;
			}
			else if (args[i].equals("-cp") && argc >= i + 1)
			{
				cli_port = Integer.parseInt(args[i + 1]);
				i = i + 2;
				continue;
			}
			else if (args[i].equals("-c") && argc >= i + 1)
			{
				sendStr = args[i + 1];
				i = i + 2;
				continue;
			}
			else
			{
				System.out.printf("args[%d]:[%s] is not support! or need a arg \n",i,args[i]);
				System.exit(1);
			}


		}

		DatagramSocket client = new DatagramSocket(cli_port);
		//String sendStr = "Hello! I'm Client";
		byte[] sendBuf;
		sendBuf = sendStr.getBytes();

		//InetAddress addr = InetAddress.getByName("www.dachengkeji.com.cn");

		//String udp_server_addr = System.getenv("UDP_SERVER_ADDR")  ;
		//udp_server_addr = udp_server_addr.length() == 0 ? udp_server_addr : "www.dachengkeji.com.cn" ;

		//InetAddress addr = InetAddress.getByName( udp_server_addr);

		InetAddress addr = InetAddress.getByName( ser_addr);

		//int port = 5050;
		//int port = Integer.parseInt(System.getenv("UDP_SERVER_PORT"));
		//port = port == 0 ? port : 5050 ;

		DatagramPacket sendPacket 
			//	= new DatagramPacket(sendBuf ,sendBuf.length , addr , port);
			= new DatagramPacket(sendBuf ,sendBuf.length , addr , ser_port);
		client.send(sendPacket);

		while(true)
		{
			byte[] recvBuf = new byte[4096];
			DatagramPacket recvPacket
				= new DatagramPacket(recvBuf , recvBuf.length);
			client.receive(recvPacket);
			String recvStr = new String(recvPacket.getData() , 0 ,recvPacket.getLength());
			System.out.println("from server:" + recvStr);
			if(recvStr.equals("quit"))
			{
				break;
			}
		}
		client.close();
	}
}