SCR脚:每次我的蜘蛛爬行时,它都会刮擦同一页(第一页)

时间:2019-07-23 11:07:50

标签: python python-3.x web-scraping scrapy

我已经编写了代码,以便在 Python 中使用 Scrapy 抓取整个页面。在下面,我粘贴了 main.py 代码。但是,每当我运行蜘蛛时, 它只会从首页抓取 (DEBUG:从<200 https://www.tuscc.si/produkti/instant-juhe>中刮下来),这也是请求标头(在检查时)。

我尝试添加粘贴在此处的“请求有效载荷”字段数据的来源:{“ action”:“ loadList”,“ skip”:64,“ filter”:{“ 1005”:[], “ 1006”:[],“ 1007”:[],“ 1009”:[],“ 1013”:[]}},以及当我尝试用它打开页面时(在此监视中进行了修改:

  

https://www.tuscc.si/produkti/instant-juhe#32;'action':'loadList';'skip':'32';'sort':'none'

),浏览器将其打开。但是外壳不整洁。我还尝试过添加请求网址https://www.tuscc.si/cache/script/tuscc.js?1563872492384中的数字,其中查询字符串参数为1563872492384;但它仍然不会从请求的页面中抓取。

此外,我尝试了许多变体并添加了很多东西,所有这些我都在线阅读了,只是为了看看是否会有进展,但是没有。...

代码是:

from scrapy.spiders import CrawlSpider
from tus_pomos.items import TusPomosItem
from tus_pomos.scrapy_splash import SplashRequest


class TusPomosSpider(CrawlSpider):
    name = 'TUSP'
    allowed_domains = ['www.tuscc.si']
    start_urls = ["https://www.tuscc.si/produkti/instant-juhe#0;1563872492384;",
                  "https://www.tuscc.si/produkti/instant-juhe#64;1563872492384;", ]
    download_delay = 5.0

    def start_requests(self):
        # payload = [
        #     {"action": "loadList",
        #      "skip": 0,
        #      "filter": {
        #          "1005": [],
        #          "1006": [],
        #          "1007": [],
        #          "1009": [],
        #          "1013": []}
        #      }]
        for url in self.start_urls:
            r = SplashRequest(url, self.parse, magic_response=False, dont_filter=True, endpoint='render.json', meta={
                'original_url': url,
                'dont_redirect': True},
                              args={
                                  'wait': 2,
                                  'html': 1
                              })
            r.meta['dont_redirect'] = True
            yield r

    def parse(self, response):
        items = TusPomosItem()
        pro = response.css(".thumb-box")
        for p in pro:
            pro_link = p.css("a::attr(href)").extract_first()
            pro_name = p.css(".description::text").extract_first()
            items['pro_link'] = pro_link
            items['pro_name'] = pro_name
            yield items

最后,我要求从分页中抓取所有页面,例如此页面(我也尝试过使用scrapy shell url命令):

  

https://www.tuscc.si/produkti/instant-juhe#64;1563872492384;

但是响应始终是第一页,并且正在反复抓取:

  

https://www.tuscc.si/produkti/instant-juhe

如果您能帮助我,我将不胜感激。谢谢


PARSE_DETAILS生成器功能

def parse_detail(self, response):
    items = TusPomosItem()
    pro = response.css(".thumb-box")
    for p in pro:
        pro_link = p.css("a::attr(href)").extract_first()
        pro_name = p.css(".description::text").extract_first()
        items['pro_link'] = pro_link
        items['pro_name'] = pro_name
        my_details = {
            'pro_link': pro_link,
            'pro_name': pro_name
        }
        with open('pro_file.json', 'w') as json_file:
            json.dump(my_details, json_file)

        yield items
        # yield scrapy.FormRequest(
        #     url='https://www.tuscc.si/produkti/instant-juhe',
        #     callback=self.parse_detail,
        #     method='POST',
        #     headers=self.headers
        #     )

在这里,我不确定是否应该按原样分配“ items”变量,还是应该从response.body中获取变量? 另外,产量应该是它的原样吗,还是应该用Request更改它(由给定的ANSWER代码部分复制)?

我是新来的,所以谢谢您的理解!

1 个答案:

答案 0 :(得分:1)

与其使用Splash呈现页面,不如从发出的基础请求中获取数据可能更有效。 下面的代码遍历所有带有文章的页面。在parse_detail下,您可以编写逻辑以将响应中的数据加载到json中,在其中您可以找到产品的“ pro_link”和“ pro_name”。

import scrapy
import json
from scrapy.spiders import Spider
from ..items import TusPomosItem


class TusPomosSpider(Spider):
    name = 'TUSP'
    allowed_domains = ['tuscc.si']
    start_urls = ["https://www.tuscc.si/produkti/instant-juhe"]
    download_delay = 5.0

    headers = {
        'Origin': 'https://www.tuscc.si',
        'Accept-Encoding': 'gzip, deflate, br',
        'Accept-Language': 'en-GB,en;q=0.9,nl-BE;q=0.8,nl;q=0.7,ro-RO;q=0.6,ro;q=0.5,en-US;q=0.4',
        'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36',
        'Content-Type': 'application/json; charset=UTF-8',
        'Accept': 'application/json, text/javascript, */*; q=0.01',
        'X-Requested-With': 'XMLHttpRequest',
        'Connection': 'keep-alive',
        'Referer': 'https://www.tuscc.si/produkti/instant-juhe',
    }

    def parse(self, response):
        number_of_pages = int(response.xpath(
            '//*[@class="paginationHolder"]//@data-size').extract_first())
        number_per_page = int(response.xpath(
            '//*[@name="pageSize"]/*[@selected="selected"]/text()').extract_first())

        for page_number in range(0, number_of_pages):
            skip = number_per_page * page_number
            data = {"action": "loadList",
                    "filter": {"1005": [], "1006": [], "1007": [], "1009": [],
                               "1013": []},
                    "skip": str(skip),
                    "sort": "none"
                    }
            yield scrapy.Request(
                url='https://www.tuscc.si/produkti/instant-juhe',
                callback=self.parse_detail,
                method='POST',
                body=json.dumps(data),
                headers=self.headers
                )

    def parse_detail(self, response):
        detail_page = json.loads(response.text)
        for product in detail_page['docs']:
            item = TusPomosItem()
            item['pro_link'] = product['url']
            item['pro_name'] = product['title']
            yield item