银行项目为后台ｓｏｃｋｅｔ通信写的程序

				/****************************************************************************
				 * Package		: com.ecSolutions.ecAppServer.server
				 * File			: PacketDecoder.java
				 * Create Date  : 2007-7-20
				 * Author		: Steven Chen
				 * 
				 * Copyright(C) 2006 ecSolutions(shanghai) Co.,Limited.All Rights Reserved.
				 *			
				 ***************************************************************************/
				
				package com.ecSolutions.ecAppServer.server;
				
				/**
				 * Decode Packet to object.
				 * 
				 * @author Steven Chen
				 * @version $Id: PacketDecoder.java,v 1.2 2007/07/26 04:10:42 stevenchen Exp $
				 */
				public interface PacketDecoder {
				
				    /**
				     * Decode packet to object. The content of the packet is readonly, and it's
				     * position will not be changed if the method return null.
				     * 
				     * @param session
				     *            session
				     * @param packet
				     *            packet
				     * @return decoded object
				     * @throws Exception
				     *             any exception
				     */
				    Object decode(Session session, Packet packet) throws Exception;
				
				}