reverseprotocolhandler.java

利用mina框架写的一个通信实例。初学者的一个好教程。

/*
 *   @(#) $Id: ReverseProtocolHandler.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.reverser;

import org.apache.mina.protocol.ProtocolHandler;
import org.apache.mina.protocol.ProtocolHandlerAdapter;
import org.apache.mina.protocol.ProtocolSession;

/**
 * {@link ProtocolHandler} implementation of reverser server protocol.
 * 
 * @author The Apache Directory Project ([e-mail])
 * @version $Rev: 357871 $, $Date: 2005-12-20 10:56:40 +0900 (Tue, 20 Dec 2005) $,
 */
public class ReverseProtocolHandler extends ProtocolHandlerAdapter {
	public void exceptionCaught(ProtocolSession session, Throwable cause) {
		// Close connection when unexpected exception is caught.
		session.close();
	}

	public void messageReceived(ProtocolSession session, Object message) {
		// Reverse reveiced string
		String str = message.toString();
		StringBuffer buf = new StringBuffer(str.length());
		for (int i = str.length() - 1; i >= 0; i--) {
			buf.append(str.charAt(i));
		}

		// and write it back.
		session.write(buf.toString());
	}
}