Scrapy CrawlSpider不会抓取第一着陆页(Scrapy CrawlSpider doe

我是新来Scrapy和我的工作一刮锻炼和我现在用的是CrawlSpider。 尽管Scrapy框架精美的作品，并遵循相关的链接，我似乎无法使CrawlSpider刮第一个链接（首页/着陆页）。 相反，它直接进入凑规则所确定的链接，但不刮登陆页面上的链接。 我不知道如何解决这个问题，因为不建议覆盖了CrawlSpider解析方法。 修改如下=真/假也不会产生任何好的结果。 下面是代码片段：

class DownloadSpider(CrawlSpider):
    name = 'downloader'
    allowed_domains = ['bnt-chemicals.de']
    start_urls = [
        "http://www.bnt-chemicals.de"        
        ]
    rules = (   
        Rule(SgmlLinkExtractor(aloow='prod'), callback='parse_item', follow=True),
        )
    fname = 1

    def parse_item(self, response):
        open(str(self.fname)+ '.txt', 'a').write(response.url)
        open(str(self.fname)+ '.txt', 'a').write(','+ str(response.meta['depth']))
        open(str(self.fname)+ '.txt', 'a').write('\n')
        open(str(self.fname)+ '.txt', 'a').write(response.body)
        open(str(self.fname)+ '.txt', 'a').write('\n')
        self.fname = self.fname + 1

Answer 1:

只要改变你的回调parse_start_url并重写它：

from scrapy.contrib.spiders import CrawlSpider, Rule
from scrapy.contrib.linkextractors.sgml import SgmlLinkExtractor

class DownloadSpider(CrawlSpider):
    name = 'downloader'
    allowed_domains = ['bnt-chemicals.de']
    start_urls = [
        "http://www.bnt-chemicals.de",
    ]
    rules = (
        Rule(SgmlLinkExtractor(allow='prod'), callback='parse_start_url', follow=True),
    )
    fname = 0

    def parse_start_url(self, response):
        self.fname += 1
        fname = '%s.txt' % self.fname

        with open(fname, 'w') as f:
            f.write('%s, %s\n' % (response.url, response.meta.get('depth', 0)))
            f.write('%s\n' % response.body)

Answer 2:

有许多这样做的方法，但最简单的一个是实施parse_start_url然后修改start_urls

from scrapy.contrib.spiders import CrawlSpider, Rule
from scrapy.contrib.linkextractors.sgml import SgmlLinkExtractor
from scrapy.selector import HtmlXPathSelector

class DownloadSpider(CrawlSpider):
    name = 'downloader'
    allowed_domains = ['bnt-chemicals.de']
    start_urls = ["http://www.bnt-chemicals.de/tunnel/index.htm"]
    rules = (
        Rule(SgmlLinkExtractor(allow='prod'), callback='parse_item', follow=True),
        )
    fname = 1

    def parse_start_url(self, response):
        return self.parse_item(response)


    def parse_item(self, response):
        open(str(self.fname)+ '.txt', 'a').write(response.url)
        open(str(self.fname)+ '.txt', 'a').write(','+ str(response.meta['depth']))
        open(str(self.fname)+ '.txt', 'a').write('\n')
        open(str(self.fname)+ '.txt', 'a').write(response.body)
        open(str(self.fname)+ '.txt', 'a').write('\n')
        self.fname = self.fname + 1

文章来源: Scrapy CrawlSpider doesn't crawl the first landing page