udpserveraction.java

uml ooad 有ppt文件 和源码哦！跟大家分享

package server;

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

public class UDPServerAction implements ServerAction {
	DatagramSocket ds;

	public UDPServerAction(DatagramSocket ds) {
		this.ds=ds;
	}

	public String receive() {
		DatagramPacket letter=new DatagramPacket(new byte[1024],0,1024);
		try {
			ds.receive(letter);
			
			InetAddress address=letter.getAddress();
			int port =letter.getPort();
			User u=new UDPUser(address,port);
			StaticData.currentUser=u;
		
		} catch (IOException e) {
			e.printStackTrace();
		}
		return new String(letter.getData(),letter.getOffset(),letter.getLength());
	}

	public void send(String text,User receiver) {
		try {
			byte[] bs=text.getBytes();
			DatagramPacket letter=new DatagramPacket(bs,0,bs.length,receiver.getAddress(),receiver.getPort());
			ds.send(letter);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
}