scrapy 爬取不在同一级页面的属性

最新推荐文章于 2024-01-05 13:56:32 发布

原创最新推荐文章于 2024-01-05 13:56:32 发布 · 353 阅读

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本文介绍如何在Scrapy爬虫项目中处理跨页面的属性抓取问题，通过中间件传递item，实现对不同层级页面数据的聚合与yield。

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在进行scrapy爬虫时，要爬取不在同一级页面的属性，使用yield scrapy.Request(url=videolink, meta={'item':item}, callback=self.parseReal2)来进行item的传递，这样就可以爬取不在同一级页面的属性，并yield给最后的item了。

    def parseReal(self, response):

        jsons = json.loads(response.body)
        res = jsons['data']

        if len(res):
            for index in range(len(res)):
                item = YoukuItem()
                videolink = "https:" + res[index]['videoLink']

                #视频Id
                item['videoid'] = res[index]['videoId']
                #视频url
                item['url'] = videolink
                #视频名称
                item['videoname'] = res[index]['title'].encode('utf-8')

                yield scrapy.Request(url=videolink, meta={'item':item}, callback=self.parseReal2)


    def parseReal2(self, response):

        #print response
        item = response.meta['item']

        #视频大类型
        videobigtype = response.xpath("//li[@class='p-row p-title']/a/text()").extract()
        if len(videobigtype) == 0:
            item['videobigtype'] = ''
        else:
            item['videobigtype'] = str(videobigtype[0].encode('utf-8'))

        #视频小类型
        vlts = response.xpath("//div[@class='p-base']/ul/li[10]/a/text()").extract()
        if len(vlts) == 0:
            item['videolittletype'] = ''
        else:
            item['videolittletype'] = ''
            for vlt in vlts:
                item['videolittletype'] = item['videolittletype'] + vlt.encode('utf-8') + '/'

        #主演
        starring = response.xpath("//div[@class='p-base']/ul/li[7]/@title").extract()
        if len(starring) == 0:
            item['starring'] = ''
        else:
            item['starring'] = starring[0]

        #导演
        directors = response.xpath("//div[@class='p-base']/ul/li[8]/a/text()").extract()
        if len(directors) == 0:
            item['director'] = ''
        else:
            item['director'] = ''
            for director in directors:
                item['director'] = item['director'] + director.encode('utf-8') + '/'

        #分数/评分
        score = response.xpath("//div[@class='p-base']/ul/li[6]/span[2]/text()").extract()
        if len(score) == 0:
            item['score'] = ''
        else:
            item['score'] = str(score[0].encode('utf-8'))

        #地区
        area = response.xpath("//div[@class='p-base']/ul/li[9]/a/text()").extract()
        if len(area) == 0:
            item['area'] = ''
        else:
            item['area'] = str(area[0].encode('utf-8'))


        yield item