echocommandhandler.java

一个用java编写的服务器,对于学习网络编程的人来说是个很好的例子

/*
 * This file is part of the QuickServer library 
 * Copyright (C) 2003-2005 QuickServer.org
 *
 * Use, modification, copying and distribution of this software is subject to
 * the terms and conditions of the GNU Lesser General Public License. 
 * You should have received a copy of the GNU LGP License along with this 
 * library; if not, you can download a copy from <http://www.quickserver.org/>.
 *
 * For questions, suggestions, bug-reports, enhancement-requests etc.
 * visit http://www.quickserver.org
 *
 */

package echoserver;

import java.net.*;
import java.io.*;
import org.quickserver.net.server.ClientCommandHandler;
import org.quickserver.net.server.ClientHandler;
import org.quickserver.net.server.ClientEventHandler;
import java.util.logging.*;

public class EchoCommandHandler implements ClientCommandHandler, ClientEventHandler {
	private static Logger logger = 
			Logger.getLogger(EchoCommandHandler.class.getName());

	//--ClientEventHandler
	public void gotConnected(ClientHandler handler)
		throws SocketTimeoutException, IOException {
		logger.fine("Connection opened : "+handler.getHostAddress());

		handler.sendClientMsg("+++++++++++++++++++++++++++++++");
		handler.sendClientMsg("| Welcome to EchoServer v " + EchoServer.version+" |");
		handler.sendClientMsg("|  Note: Password = Username  |");
		handler.sendClientMsg("|        Send 'Quit' to exit  |");
		handler.sendClientMsg("+++++++++++++++++++++++++++++++");
	}

	public void lostConnection(ClientHandler handler) 
		throws IOException {
		handler.sendSystemMsg("Connection lost : "+
			handler.getSocket().getInetAddress(), Level.FINE);
	}
	public void closingConnection(ClientHandler handler) 
		throws IOException {
		logger.fine("Connection closed : "+
			handler.getSocket().getInetAddress());
	}
	//--ClientEventHandler

	public void handleCommand(ClientHandler handler, String command)
			throws SocketTimeoutException, IOException {
		if(command.toLowerCase().equals("quit")) {
			handler.sendClientMsg("Bye ;-)");
			handler.closeConnection();
		} else {
			handler.sendClientMsg("Echo : "+command);
		}
	}
}