如何使用scrapy抓取依赖于帖子的网站答案

【问题标题】：How to crawl a post dependent website using scrapy如何使用scrapy抓取依赖于帖子的网站
【发布时间】：2013-04-30 11:42:55
【问题描述】：

我正在尝试抓取保险网站 www.ehealthinsurance.com。它的主页有一个依赖于 POST 的表单，其中它采用某些值和生成下一页。我正在尝试传递值但看不到我想要的所需标签的 HTML 源代码。任何建议都会有很大帮助。

内联是scrapy代码：

class ehealthSpider(BaseSpider):
    name = "ehealth"
    allowed_domains = ["ehealthinsurance.com/"]
    start_urls = ["http://www.ehealthinsurance.com/individual-health-insurance"]

    def parse(self, response):
        yield FormRequest.from_response(response,
                                        formname='main',
                                        formdata={'census.zipCode': '48341',
                                                  'census.requestEffectiveDate': '06/01/2013',
                                                  'census.primary.gender': 'MALE',
                                                  'census.primary.month': '12',
                                                  'census.primary.day': '01',
                                                  'census.primary.year': '1971',
                                                  'census.primary.tobacco': 'No',
                                                  'census.primary.student': 'No'}, callback=self.parseAnnonces)

    def parseAnnonces(self, response):
        hxs = HtmlXPathSelector(response)
        data = hxs.select('//div[@class="main-wrap"]').extract()
        #print encoding
        print data

这是终端响应中的爬虫

  2013-04-30 16:34:16+0530 [elyse] DEBUG: Crawled (200) <GET http://www.ehealthin
  urance.com/individual-health-insurance> (referer: None)
  2013-04-30 16:34:17+0530 [elyse] DEBUG: Filtered offsite request to 'www.ehealt
  insurance.com': <POST http://www.ehealthinsurance.com/individual-health-insuran
  e;jsessionid=F5A1123CE731FDDDC1A7A31CD46CC132.prfo23a>
  2013-04-30 16:34:17+0530 [elyse] INFO: Closing spider (finished)
  2013-04-30 16:34:17+0530 [elyse] INFO: Dumping Scrapy stats:
    {'downloader/request_bytes': 257,
     'downloader/request_count': 1,
     'downloader/request_method_count/GET': 1,
     'downloader/response_bytes': 32561,
     'downloader/response_count': 1,
     'downloader/response_status_count/200': 1,
     'finish_reason': 'finished',
     'finish_time': datetime.datetime(2013, 4, 30, 11, 4, 17, 22000),
     'log_count/DEBUG': 8,
     'log_count/INFO': 4,
     'request_depth_max': 1,
     'response_received_count': 1,
     'scheduler/dequeued': 1,
     'scheduler/dequeued/memory': 1,
     'scheduler/enqueued': 1,
     'scheduler/enqueued/memory': 1,
     'start_time': datetime.datetime(2013, 4, 30, 11, 4, 10, 494000)}

您能帮我获取所需的数据吗？

【问题讨论】：

问题是你试图在页面显示之前抓取页面：中间有一个页面加载 - 在提交表单之后和结果显示之前，加上重定向。看起来很难刮。
谢谢alecxe。我研究了相同的解决方法，我理解的是 Selenium with scrapy。但是不知道如何将硒加载的页面解析为scrapy？任何帮助表示赞赏

标签： http post scrapy web-crawler

【解决方案1】：

中间请求的小技巧，它可以工作。也更正了formname。 Scrapy 很棒的调试工具是inspect_response(response)

from scrapy.selector import Selector
from scrapy.contrib.linkextractors.sgml import SgmlLinkExtractor
from scrapy.contrib.spiders import CrawlSpider, Rule
from healthinsspider.items import HealthinsspiderItem
from scrapy.shell import inspect_response
from scrapy.http import FormRequest
from scrapy.http import Request
import time

class EhealthspiderSpider(CrawlSpider):
    name = 'ehealthSpider'
    allowed_domains = ['ehealthinsurance.com']
    start_urls = ["http://www.ehealthinsurance.com/individual-health-insurance"]

    def parse(self, response):
        yield FormRequest.from_response(response,
                                        formname='form-census',
                                        formdata={'census.zipCode': '48341',
                                                  'census.requestEffectiveDate': '06/01/2013',
                                                  'census.primary.gender': 'MALE',
                                                  'census.primary.month': '12',
                                                  'census.primary.day': '01',
                                                  'census.primary.year': '1971',
                                                  'census.primary.tobacco': 'No',
                                                  'census.primary.student': 'No'}, callback=self.InterRequest,
                                                  dont_filter=True)

    def InterRequest(self, response):
        # sleep so, that our request can be processed by the server, than go to results
        time.sleep(10)
        return Request(url='https://www.ehealthinsurance.com/ehi/ifp/individual-family-health-insurance!goToScreen?referer=https%3A%2F%2Fwww.ehealthinsurance.com%2Fehi%2Fifp%2Findividual-health-insurance%3FredirectFormHTTP&sourcePage=&edit=false&ajax=false&screenName=best-sellers', dont_filter=True, callback=self.parseAnnonces)

    def parseAnnonces(self, response):
        inspect_response(response)
        hxs = Selector(response)
        data = hxs.select('//div[@class="main-wrap"]').extract()
        #print encoding
        print data

附： cookies应该在settings.py中启用：COOKIES_ENABLED=True

【讨论】：