shoppingcartfactory.java

项目是实现网络购物功能

package com.tarena.shoppingcart.util;

import java.io.InputStream;
import java.util.Properties;
import com.tarena.shoppingcart.biz.ShoppingCartBiz;
import com.tarena.shoppingcart.dao.ShoppingCartDao;

/**
 * 
 * 描述：用于创建dao接口的实例；根据属性文件shoppingcartdao.properties指定返回的dao实例类型
 */

public class ShoppingCartFactory{
	private static ShoppingCartDao dao;
	private static ShoppingCartBiz biz;
	
	static{
		try {
			InputStream in = ShoppingCartFactory.class.getResourceAsStream(
					"/com/tarena/shoppingcart/resources/shoppingcart.properties");
			Properties pros = new Properties();
			pros.load(in);
			dao = (ShoppingCartDao) Class.forName(pros.getProperty("daoClassName")).newInstance();	
			biz = (ShoppingCartBiz) Class.forName(pros.getProperty("bizClassName")).newInstance();	
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	private ShoppingCartFactory(){
		
	}
	
	public static ShoppingCartDao getShoppingCartDao(){
		return dao;
	}
	
	public static ShoppingCartBiz getShoppingCartBiz(){
		return biz;
	}
}