scrapy 从报纸中提取到 txt

Question

我对 scrapy 有点陌生，我需要提取一些报纸信息来完成工作，我已经尝试了一些教程，但 none 其中的效果如我所料，objective是对给定的url，提取前4或5个主题的信息（点击link时的内部信息）。我首先尝试浏览 links，但我失败了，输出为空并显示 0 个已爬网页面。

import scrapy

class BlogSpider(scrapy.Spider):
    name = 'blogspider'
    start_urls = ['http://www.dn.pt/pesquisa.html?q=economia%20empresas']

    def parse(self, response):
        for title in response.css('div.gs-title'):
            yield 
            {
            'title': title.css('a.gs-title::text').extract_first()
            }

the title / link for the first news

the div containing all the news

抓取程序转到第一个 link，并提取关于 link 的信息，然后转到第二个，并提取第二个的信息。就像第 4 或 5 个新闻一样。

日志：

2017-05-03 12:46:37 [scrapy.utils.log] INFO: Scrapy 1.3.3 started (bot: scrapybot)
2017-05-03 12:46:37 [scrapy.utils.log] INFO: Overridden settings: {'SPIDER_LOADER_WARN_ONLY': True, 'LOG_FILE': 'output.log'}
2017-05-03 12:46:37 [scrapy.middleware] INFO: Enabled extensions:
['scrapy.extensions.logstats.LogStats',
 'scrapy.extensions.telnet.TelnetConsole',
 'scrapy.extensions.corestats.CoreStats']
2017-05-03 12:46:37 [scrapy.middleware] INFO: Enabled downloader middlewares:
['scrapy.downloadermiddlewares.httpauth.HttpAuthMiddleware', 'scrapy.downloadermiddlewares.downloadtimeout.DownloadTimeoutMiddleware', 'scrapy.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware', 'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware',  'scrapy.downloadermiddlewares.retry.RetryMiddleware',  'scrapy.downloadermiddlewares.redirect.MetaRefreshMiddleware',  'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware',  'scrapy.downloadermiddlewares.redirect.RedirectMiddleware',  'scrapy.downloadermiddlewares.cookies.CookiesMiddleware',  'scrapy.downloadermiddlewares.stats.DownloaderStats']
2017-05-03 12:46:37 [scrapy.middleware] INFO: Enabled spider middlewares:
['scrapy.spidermiddlewares.httperror.HttpErrorMiddleware',
 'scrapy.spidermiddlewares.offsite.OffsiteMiddleware',
 'scrapy.spidermiddlewares.referer.RefererMiddleware',
 'scrapy.spidermiddlewares.urllength.UrlLengthMiddleware',
 'scrapy.spidermiddlewares.depth.DepthMiddleware']
2017-05-03 12:46:37 [scrapy.middleware] INFO: Enabled item pipelines:
[]
2017-05-03 12:46:37 [scrapy.core.engine] INFO: Spider opened
2017-05-03 12:46:37 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2017-05-03 12:46:37 [scrapy.extensions.telnet] DEBUG: Telnet console listening on 127.0.0.1:6023
2017-05-03 12:46:38 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://www.dn.pt/pesquisa.html?q=economia%20empresas> (referer: None)
2017-05-03 12:46:38 [scrapy.core.engine] INFO: Closing spider (finished)
2017-05-03 12:46:38 [scrapy.statscollectors] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 242,
 'downloader/request_count': 1,
 'downloader/request_method_count/GET': 1,
 'downloader/response_bytes': 16289,
 'downloader/response_count': 1,
 'downloader/response_status_count/200': 1,
 'finish_reason': 'finished',
 'finish_time': datetime.datetime(2017, 5, 3, 11, 46, 38, 199050),
 'log_count/DEBUG': 2,
 'log_count/INFO': 7,
 'response_received_count': 1,
 'scheduler/dequeued': 1,
 'scheduler/dequeued/memory': 1,
 'scheduler/enqueued': 1,
 'scheduler/enqueued/memory': 1,
 'start_time': datetime.datetime(2017, 5, 3, 11, 46, 37, 873062)}
2017-05-03 12:46:38 [scrapy.core.engine] INFO: Spider closed (finished)

Answer 1

我快速浏览了 http://www.dn.pt/pesquisa.html?q=economia%20empresas，内容似乎没有随 scrapy 捕获的初始 HTML 一起提供。

相反，内容由后续的 Javascript / AJAX 请求下载和呈现，Scrapy 不会开箱即用。

可能的解决方案：

您可以使用 Firebug 或 Chrome 开发人员工具来了解这些后台请求的工作原理，并尝试直接模拟和抓取这些后台请求。（意味着更多的工作，但由此产生的刮板要快得多）。

或者您添加 Splash 或 Selenium 实例，使它们呈现 Javascript，然后直接抓取呈现的页面。

scrapy 从报纸中提取到 txt

scrapy extrat from newspapers to txt

scrapy

scrapy-spider