daofactory.java

一个很不错的在线投票系统

package cn.hxex.vote.util;

import cn.hxex.vote.dao.IVoteDAO;

/**
 * DAO工厂类
 * 
 * @author galaxy
 *
 */
public class DAOFactory
{
	/**
	 * 得到IVoteDAO接口实现类的实例
	 * @return IVoteDAO接口的实现类的实例
	 */
	public static IVoteDAO getVoteDAO()
	{
		return (IVoteDAO)getInstance( "cn.hxex.vote.dao.hibernate.VoteDAO" );
	}
	
	/**
	 * 得到某个类的实例
	 * @param className 类名
	 * @return 该类的实例对象
	 */
	static Object getInstance( String className )
	{
		try
		{
			Class cls = Class.forName( className );
			return cls.newInstance();
		} 
		catch (ClassNotFoundException e)
		{
			e.printStackTrace();
			return null;
		} 
		catch (InstantiationException e)
		{
			e.printStackTrace();
			return null;
		} 
		catch (IllegalAccessException e)
		{
			e.printStackTrace();
			return null;
		}
	}
}