daofactory.java

一个小型的购物商店

/*
 * DaoFactory.java
 *
 * Created on 2006年9月23日, 下午5:46
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package com.shopping.dao;

import java.io.*;

/**
 * 
 * @author 曹昊
 */
public class DaoFactory
{
/*    public static ShoppingCartDao getInstance(String name)
    {
        if (name.equals("JDBC"))
        {
            return new JdbcDaoImpl();
        } else if (name.equals("HIBR"))
        {
            return new HibrDaoImpl();
        } else
            return null;
    }*/

    public static ShoppingCartDao getInstance()
    {
        Object o = null;
        try
        {
            //读配置文件
            ClassLoader loader = DaoFactory.class.getClassLoader();
            InputStream input = loader.getResourceAsStream("com/shopping/resource/impl.properties");
            InputStreamReader isr = new InputStreamReader(input);
            BufferedReader in = new BufferedReader(isr);
            
            String name = in.readLine();
            in.close();
            Class c = Class.forName("com.shopping.dao." + name + "DaoImpl");
            o = c.newInstance();
        } catch (FileNotFoundException ex)
        {
            ex.printStackTrace();
        } catch (InstantiationException ex)
        {
            ex.printStackTrace();
        } catch (IllegalAccessException ex)
        {
            ex.printStackTrace();
        } catch (ClassNotFoundException ex)
        {
            ex.printStackTrace();
        } catch (IOException ex)
        {
            ex.printStackTrace();
        }
        return (ShoppingCartDao) o;
    }
}