from scrapy.pipelines.images import ImagesPipeline
import scrapy
class ImgspiderdemoPipeline(ImagesPipeline):

def get_media_requests(self, item, info):
    print(990)
    lists=len(item["image_urls"])
    for index in lists:
        url=item["image_urls"][index]
        name=item["imagename"][index]
        yield scrapy.Request(url=url,meta={"name":name})

def file_path(self, request, response=None, info=None):
    print(response.meta["name"])
    return response.meta["name"]+".jpg"


def process_item(self, item, spider):
    print(item["imagename"][0])
    return item

ITEM_PIPELINES = {
'imgspiderdemo.pipelines.ImgspiderdemoPipeline': 800,

}
重写了插件，没报错但好像没效果没有执行，图片没下载谁知道怎么回事