drp-2、Properties的读取及实例化

1、创建Properties文件---factory-class-mapping.properties
      #factory-class-name=net.nyist.drp.item.factory.ItemDaoFactory4Mysql
      factory-class-name=net.nyist.drp.item.factory.ItemDaoFactory4Oracle
2、创建读取Properties的方法

/**
     * 读取factory-class-mapping.properties配置文件
     *
     */
    private Properties loadProperties() {
        Properties props = new Properties();
        InputStream inStream = Thread.currentThread().getContextClassLoader()
        .getResourceAsStream("net/nyist/drp/item/manager/factory-class-mapping.properties");
        
        try {
            props.load(inStream);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return props;
    }

3、实例化配置文件中所对应的类

Properties props = this.loadProperties();
String className = props.getProperty("factory-class-name");
itemDaoFactory = (ItemDaoFactory)Class.forName(className).newInstance();