了解 scrapy 重命名图像的工作原理

我看到所有问题here，但我还不明白。

实际上，使用下面的代码我做了我需要的事情，除了重命名图像，所以我尝试更改名称items.py文件，请检查里面的注释。

设置.py

SPIDER_MODULES = ['xxx.spiders']
NEWSPIDER_MODULE = 'xxx.spiders'
ITEM_PIPELINES = {'scrapy.pipelines.images.ImagesPipeline': 1}
IMAGES_STORE = '/home/magicnt/xxx/images'

items.py

class XxxItem(scrapy.Item):
    # define the fields for your item here like:
    # name = scrapy.Field()
    title = scrapy.Field()
    image_urls = scrapy.Field()
    #images = scrapy.Field()<---with that code work with default name images
    images = title<--- I try rename here, but not work

蜘蛛.py

from xxx.items import XxxItem
import scrapy
from scrapy.pipelines.images import ImagesPipeline
from scrapy.exceptions import DropItem

class CoverSpider(scrapy.Spider):
    name = "pyimagesearch-cover-spider"
    start_urls = ['https://xxx.com.br/product']
    def parse(self, response):
        for bimb in response.css('#mod_imoveis_result'):
            imageURL = bimb.xpath('./div[@id="g-img-imo"]/div[@class="img_p_results"]/img/@src').extract_first()
            title = bimb.css('#titulo_imovel::text').extract_first()
            yield {
                'image_urls' : [response.urljoin(imageURL)],
                'title' : title
            }
        next_page = response.xpath('//a[contains(@class, "num_pages") and contains(@class, "pg_number_next")]/@href').extract_first()
        yield response.follow(next_page, self.parse)

我的目标是使用项目中的标题重命名下载的图像。欢迎任何有关此目标的提示。

我对 python 和 oo 完全陌生，我通常使用结构性 php 进行抓取，但意识到它是一个多么好的 scrapy，请求一点耐心和帮助。

我的代码基于Scrapy Image Pipeline：如何重命名图像？我一周前测试过它，它对我自己的蜘蛛有效。

# This pipeline is designed for an item with multiple images
class ImagesWithNamesPipeline(ImagesPipeline):
    def get_media_requests(self, item, info):
        # values in field "image_name" must have suffix ".jpg"
        # you can only change "image_name" to your own image name filed "images"
        # however it should be a list
        for (image_url, image_name) in zip(item[self.IMAGES_URLS_FIELD], item["image_names"]):
            yield scrapy.Request(url=image_url, meta={"image_name": image_name})

    def file_path(self, request, response=None, info=None):
        image_name = request.meta["image_name"]
        return image_name

以下是如何ImagePipeline works:

管道将执行image_downloaded -> get_images -> file_path为了。 （“->”表示调用）

• image_downloaded：保存图像get_images通过调用返回persist_file
• get_images：将图像转换为JPEG
• file_path: 返回相对路径图像的

我扫了一遍ImagePipeline的源代码并没有找到用于重命名图像的特殊字段。 Scrapy 将以这种方式重命名它：

def file_path(self, request, response=None, info=None):
    image_guid = hashlib.sha1(to_bytes(url)).hexdigest()  # change to request.url after deprecation
    return 'full/%s.jpg' % (image_guid)

因此我们应该重写方法file_path。根据FilePipeline的源代码ImagePipeline继承了哪个，我们只需要返回相对路径 and persist_file会把事情做好的。