Scrapy蜘蛛不保存html文件

Question

我有一个我生成的 Scrapy 蜘蛛。 蜘蛛的目的是返回网络数据以绘制网络以及为蜘蛛到达的每个页面返回 html 文件。 蜘蛛正在实现第一个目标，但没有实现第二个目标。 它会生成一个带有跟踪信息的 csv 文件，但我看不到它正在保存 html 文件。

# -*- coding: utf-8 -*-
from scrapy.selector import HtmlXPathSelector
from scrapy.linkextractors import LinkExtractor
from scrapy.contrib.spiders import CrawlSpider, Rule
from scrapy.utils.url import urljoin_rfc
from sitegraph.items import SitegraphItem


class CrawlSpider(CrawlSpider):
    name = "example"
    custom_settings = {
    'DEPTH_LIMIT': '1',
    }
    allowed_domains = []
    start_urls = (
        'http://exampleurl.com',
    )

    rules = (
        Rule(LinkExtractor(allow=r'/'), callback='parse_item', follow=True),
    )

    def parse_item(self, response):
        hxs = HtmlXPathSelector(response)
        i = SitegraphItem()
        i['url'] = response.url
        # i['http_status'] = response.status
        llinks=[]
        for anchor in hxs.select('//a[@href]'):
            href=anchor.select('@href').extract()[0]
            if not href.lower().startswith("javascript"):
                llinks.append(urljoin_rfc(response.url,href))
        i['linkedurls'] = llinks
        return i

    def parse(self, response):
        filename = response.url.split("/")[-1] + '.html'
        with open(filename, 'wb') as f:
            f.write(response.body)

我收到的回溯如下：

Traceback (most recent call last):
  File "...\Anaconda3\lib\site-packages\scrapy\core\downloader\middleware.py", line 43, in process_request
    defer.returnValue((yield download_func(request=request,spider=spider)))
twisted.internet.error.TCPTimedOutError: TCP connection timed out: 10060: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond..
2019-07-23 14:16:41 [scrapy.downloadermiddlewares.retry] DEBUG: Gave up retrying <GET http://externalurl.com/> (failed 3 times): TCP connection timed out: 10060: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond..
2019-07-23 14:16:41 [scrapy.core.scraper] ERROR: Error downloading <GET http://externalurl.com/>
Traceback (most recent call last):
  File "...\Anaconda3\lib\site-packages\scrapy\core\downloader\middleware.py", line 43, in process_request
    defer.returnValue((yield download_func(request=request,spider=spider)))
twisted.internet.error.TCPTimedOutError: TCP connection timed out: 10060: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond..
2019-07-23 14:16:41 [scrapy.core.engine] INFO: Closing spider (finished)
2019-07-23 14:16:41 [scrapy.extensions.feedexport] INFO: Stored csv feed (153 items) in: exampledomainlevel1.csv

Answer 1

parse方法：

根据scrapy docs和另一个堆栈溢出问题，不建议覆盖parse方法，因为crawlspider使用它来实现它的逻辑。

如果您需要覆盖parse方法并同时计数

Crawlspider.parse原始源代码- 您需要添加它的原始源来修复parse方法：

def parse(self, response):
    filename = response.url.split("/")[-1] + '.html'
    with open(filename, 'wb') as f:
        f.write(response.body)
    return self._parse_response(response, self.parse_start_url, cb_kwargs={}, follow=True)

csv提要：
此日志行： 2019-07-23 14:16:41 [scrapy.extensions.feedexport] INFO: Stored csv feed (153 items) in: exampledomainlevel1.csv - 表示启用了 csv feedexporter （可能在settings.py项目设置文件中） .)

更新
我再次观察了Crawlspider源代码。
看起来parse方法在开始时只调用了一次，并且没有涵盖所有的 Web 响应。
如果我的理论是正确的 - 将此函数添加到您的蜘蛛类后应该保存所有 html 响应：

def _response_downloaded(self, response):
    filename = response.url.split("/")[-1] + '.html'
    with open(filename, 'wb') as f:
        f.write(response.body)    
    rule = self._rules[response.meta['rule']]
    return self._parse_response(response, rule.callback, rule.cb_kwargs, rule.follow)