这就是我在Scrapy
0.10中解决问题的方式。检查FSImagesStoreChangeableDirectory的persist_image方法。下载图像的文件名是密钥

class FSImagesStoreChangeableDirectory(FSImagesStore):

    def persist_image(self, key, image, buf, info,append_path):

        absolute_path = self._get_filesystem_path(append_path+'/'+key)
        self._mkdir(os.path.dirname(absolute_path), info)
        image.save(absolute_path)

class ProjectPipeline(ImagesPipeline):

    def __init__(self):
        super(ImagesPipeline, self).__init__()
        store_uri = settings.IMAGES_STORE
        if not store_uri:
            raise NotConfigured
        self.store = FSImagesStoreChangeableDirectory(store_uri)