跟随超链接和“过滤的异地请求" [英] Following hyperlink and "Filtered offsite request"

问题描述

我知道那里有几个相关的线程，它们对我帮助很大，但我仍然无法一路走下去.我现在运行代码不会导致错误，但我的 csv 文件中没有任何内容.我有以下 Scrapy 蜘蛛，它从一个网页开始，然后跟随一个超链接，并抓取链接的页面:

I know that there are several related threads out there, and they have helped me a lot, but I still can't get all the way. I am at the point where running the code doesn't result in errors, but I get nothing in my csv file. I have the following Scrapy spider that starts on one webpage, then follows a hyperlink, and scrapes the linked page:

from scrapy.http import Request
from scrapy.spider import BaseSpider
from scrapy.selector import HtmlXPathSelector
from scrapy.item import Item, Field

class bbrItem(Item):
    Year = Field()
    AppraisalDate = Field()
    PropertyValue = Field()
    LandValue = Field()
    Usage = Field()
    LandSize = Field()
    Address = Field()    

class spiderBBRTest(BaseSpider):
    name = 'spiderBBRTest'
    allowed_domains = ["http://boliga.dk"]
    start_urls = ['http://www.boliga.dk/bbr/resultater?sort=hus_nr_sort-a,etage-a,side-a&gade=Septembervej&hus_nr=29&ipostnr=2730']

    def parse2(self, response):        
        hxs = HtmlXPathSelector(response)
        bbrs2 = hxs.select("id('evaluationControl')/div[2]/div")
        bbrs = iter(bbrs2)
        next(bbrs)
        for bbr in bbrs:
            item = bbrItem()
            item['Year'] = bbr.select("table/tbody/tr[1]/td[2]/text()").extract()
            item['AppraisalDate'] = bbr.select("table/tbody/tr[2]/td[2]/text()").extract()
            item['PropertyValue'] = bbr.select("table/tbody/tr[3]/td[2]/text()").extract()
            item['LandValue'] = bbr.select("table/tbody/tr[4]/td[2]/text()").extract()
            item['Usage'] = bbr.select("table/tbody/tr[5]/td[2]/text()").extract()
            item['LandSize'] = bbr.select("table/tbody/tr[6]/td[2]/text()").extract()
            item['Address']  = response.meta['address']
            yield item

    def parse(self, response):
        hxs = HtmlXPathSelector(response)
        PartUrl = ''.join(hxs.select("id('searchresult')/tr/td[1]/a/@href").extract())
        url2 = ''.join(["http://www.boliga.dk", PartUrl])
        yield Request(url=url2, meta={'address': hxs.select("id('searchresult')/tr/td[1]/a[@href]/text()").extract()}, callback=self.parse2)

我正在尝试将结果导出到 csv 文件，但我没有得到该文件.但是，运行代码不会导致任何错误.我知道这是一个只有一个 URL 的简单示例，但它说明了我的问题.

I am trying to export the results to a csv file, but I get nothing the file. Running the code, however, doesn't result in any errors. I know it's a simplyfied example with only one URL, but it illustrates my problem.

我认为我的问题可能是我没有告诉 Scrapy 我想在 Parse2 方法中保存数据.

I think my problem could be that I am not telling Scrapy that I want to save the data in the Parse2 method.

顺便说一句，我以 scrapy crawl spiderBBR -o scraped_data.csv -t csv

推荐答案

您需要修改 parse 中产生的 Request 以使用 parse2作为它的回调.

You need to modify your yielded Request in parse to use parse2 as its callback.

allowed_domains 不应包含 http 前缀，例如:

allowed_domains shouldn't include the http prefix eg:

allowed_domains = ["boliga.dk"]

试试看你的蜘蛛是否仍然正常运行，而不是将 allowed_domains 留空

Try that and see if your spider still runs correctly instead of leaving allowed_domains blank

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