daofactory.java

留言版系统：这是在Eclipse环境下开发的

package cn.hxex.message.util;

import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.digester.Digester;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.xml.sax.SAXException;

import cn.hxex.message.config.MessageConfig;

public class DaoFactory 
{
    private static Log log = LogFactory.getLog(DaoFactory.class);

	public static final MessageConfig messageConfig;
	
	static
	{
		Digester digester = new Digester();
		digester.setValidating( false );
		
		digester.addObjectCreate( "config", "cn.hxex.message.config.MessageConfig" );
		digester.addSetProperties( "config" );
		
		digester.addObjectCreate( "config/bean", "cn.hxex.message.config.BeanConfig" );
		digester.addSetProperties( "config/bean" );
		digester.addSetNext( "config/bean", "addBean", "cn.hxex.message.config.BeanConfig" );
		
		ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
		InputStream in = classLoader.getResourceAsStream( "MessageConfig.xml" );
		MessageConfig config = null;
		try {
			if( in!=null )
				config = (MessageConfig)digester.parse( in );
		} catch (IOException e) {
			e.printStackTrace();
		} catch (SAXException e) {
			e.printStackTrace();
		}
		messageConfig = config;
	}
	
	public static Object getDao( String name )
	{
		if( null==messageConfig ) return null;
		
		return messageConfig.getBean( name );
	}
}