爬网图像失败

2024-03-29 07:03:43 发布

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我试图从一个网站抓取图片,其中包含以下垃圾代码:

import urlparse
from PIL import Image
from scrapy.exceptions import DropItem, NotConfigured, IgnoreRequest
from scrapy.spider import BaseSpider
from scrapy.contrib.spiders import CrawlSpider, Rule
from scrapy.contrib.linkextractors.sgml import SgmlLinkExtractor
from scrapy.contrib.loader import XPathItemLoader
from scrapy.selector import HtmlXPathSelector
from scrapy.http.request import Request

from scrapy.contrib.pipeline.images import ImagesPipeline
from mobile.items import Website

class MobileSpider(CrawlSpider):
    name = "mobile"
    allowed_domains = ["mobile-store.ro"]
    start_urls = ["http://www.mobile-store.ro/produse/"]
    rules = (
        Rule(SgmlLinkExtractor(allow=r"/produs/d+"), follow=True),
        Rule(SgmlLinkExtractor(allow=r"/produse/d+"), callback='parse_item')
    )

    def parse(self, response, response2):
        hxs = HtmlXPathSelector(response)
        next_page = hxs.select("//ul[@class='products']/li/a/@href").extract()
        if not not next_page:
            yield Request(next_page[0], self.parse)
        sites = hxs.select('//div[@id="wrapper"]/div[@id="content"]')
        items = []

        for site in sites:
            item = Website()
            item['nume'] = site.select('//div[@class="summary"]/h1[@class="product_title entry-title"]/text()').extract()
            item['categorie'] = site.select('//div[@class="summary"]/div[@class="product_meta"]/span[@class="posted_in"]/a/text()').extract()
            item['brand'] = site.select('//div[@class="summary"]/div[@class="product_meta"]/span[@class="tagged_as"]/a/text()').extract()
            item['descriere'] = site.select('//div[@class="woocommerce_tabs"]/div[@id="tab-description"]/p/text()').extract()
            image_relative_url = site.select('//div[@class="ad-image-wrapper"]/div[@class="ad-image"]/img[@class="lightbox"]/@src').extract()
            item['image_urls'] = [urlparse.urljoin(response.url,image_relative_url)]
            #item['image_urls'] = site.select('//div[@class="ad-image-wrapper"]/div[@class="ad-image"]/img[@class="lightbox"]/@src').extract()
            item['pret'] = site.select('//div[@class="summary"]/div[1]/p[@class="price"]/span[@class="amount"]/text()').extract()
            item['url'] = response.url
            items.append(item)
        for item in items:
            yield item

settings.py:
SPIDER_MODULES = ['mobile.spiders']
NEWSPIDER_MODULE = 'mobile.spiders'
DEFAULT_ITEM_CLASS = 'mobile.items.Website'

ITEM_PIPELINES = ['scrapy.contrib.pipeline.images.ImagesPipeline']

items.py:
from scrapy.item import Item, Field

class Website(Item):
    nume = Field()
    descriere = Field()
    categorie = Field()
    brand = Field()
    pret = Field()
    url = Field()
    image_urls = Field()
    images = Field()
    image_paths = Field()

pipelines.py:
from mobile.contrib.pipeline.images import ImagesPipeline
from scrapy.exceptions import DropItem
from scrapy.http import Request

class MyImagesPipeline(ImagesPipeline):

    def get_media_requests(self, item, info):
        for image_url in item['image_urls']:
            yield Request(image_url)

    def item_completed(self, results, item, info):
        image_paths = [x['path'] for ok, x in results if ok]
        if not image_paths:
            raise DropItem("Item contains no images")
        item['image_paths'] = image_paths
        return item

当我尝试使用以下代码获取图像url时,会出现问题:

^{pr2}$

它返回页面url而不是图像url。所有其他字段都已正确爬网。有没有关于如何解决这个问题并正确获取图像url的线索?在


Tags: fromimageimportdivurlfieldsiteextract
1条回答
网友
1楼 · 发布于 2024-03-29 07:03:43

这是因为图像(以及ad-image-wrapperdiv的全部内容)是通过javascript动态填充的。在

parse方法中转储response.body帮助我发现实际的图像链接最初保存在ad-thumb-list列表中。因此,请尝试使用以下方法获取图像url:

image_relative_url = site.select('//ul[@class="ad-thumb-list"]/li[@class="first_item"]/a/@href').extract()
if image_relative_url:
    image_relative_url = image_relative_url[0]

希望这就是你所需要的。在

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