Java工厂模式创建对象

public class DaoFactory {
    private static Properties pro = new Properties();
    static {
        try {
            pro.load(new FileReader("dao.txt"));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    public static Object getBean(String interfaceName) {
        //根据键，得到值
        String value = pro.getProperty(interfaceName);
        try {
            //加载类  得到类模板
            Class c = Class.forName(value);
            //调用无参构造方法，产生实现类对象
            return c.newInstance();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}