echoprotocolhandler.java

利用mina框架写的一个通信实例。初学者的一个好教程。

/*
 *   @(#) $Id: EchoProtocolHandler.java 357871 2005-12-20 01:56:40Z trustin $
 *
 *   Copyright 2004 The Apache Software Foundation
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 *
 */
package org.apache.mina.examples.echoserver;

import org.apache.mina.common.ByteBuffer;
import org.apache.mina.common.IdleStatus;
import org.apache.mina.common.SessionConfig;
import org.apache.mina.io.IoHandler;
import org.apache.mina.io.IoHandlerAdapter;
import org.apache.mina.io.IoSession;
import org.apache.mina.io.socket.SocketSessionConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * {@link IoHandler} implementation for echo server.
 * 
 * @author The Apache Directory Project ([e-mail])
 * @version $Rev: 357871 $, $Date: 2005-12-20 10:56:40 +0900 (Tue, 20 Dec 2005) $,
 */
public class EchoProtocolHandler extends IoHandlerAdapter {
	private static final Logger log = LoggerFactory
			.getLogger(EchoProtocolHandler.class);

	public void sessionCreated(IoSession session) {
		SessionConfig cfg = session.getConfig();
		if (cfg instanceof SocketSessionConfig) {
			((SocketSessionConfig) cfg).setSessionReceiveBufferSize(2048);
		}

		cfg.setIdleTime(IdleStatus.BOTH_IDLE, 10);
	}

	public void sessionIdle(IoSession session, IdleStatus status) {
		log.info("*** IDLE #" + session.getIdleCount(IdleStatus.BOTH_IDLE)
				+ " ***");
	}

	public void exceptionCaught(IoSession session, Throwable cause) {
		session.close();
	}

	public void dataRead(IoSession session, ByteBuffer rb) {
		// Write the received data back to remote peer
		ByteBuffer wb = ByteBuffer.allocate(rb.remaining());
		wb.put(rb);
		wb.flip();
		session.write(wb, null);
	}
}