udpserver.java

简单通信程序

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

public class UDPServer {
	public static final int DEFAULT_PORT = 12345;

	public static void main( String[] args ) {
		try {

			DatagramSocket ds = new DatagramSocket( DEFAULT_PORT );
			while ( true ) {
				byte[] buf = new byte[256];
				DatagramPacket ip = new DatagramPacket( buf, buf.length );
				ds.receive( ip );
				String messageFromClient = new String( buf ).trim();
				System.out.println( "C:" + messageFromClient );
				if ( messageFromClient.equals("exit") ) {
					break;
				}
			}
		} catch ( SocketException e ) {
			e.printStackTrace();
		} catch ( IOException e ) {
			e.printStackTrace();
		}
	}
}