def ExportData(owner, fmt, filename, data):
name = 'Web.'+owner
mod = __import__(name)
for comp in name.split('.')[1:]:
mod = getattr(mod, comp)#确保多层的都可以导入
cls = getattr(mod, fmt)()#类的实例化
cls.SaveToFile(filename, data)#类的数据输出函数