您好，我正在使用 scrapy 访问我们的 Intranet 网站并进行一些抓取，一切似乎都正常，我可以访问它，但是当我将数据提取到 csv 文件中时，csv 文件为空，我没有收到任何错误我运行这个。 HTML 中的每一列(目录号、设备 ID、订阅者 ID 等)都有数据，那么我如何使用 scrapy 获取该数据。
from scrapy.contrib.spiders.init import InitSpider
from scrapy.http import Request, FormRequest
from scrapy.contrib.linkextractors.sgml import SgmlLinkExtractor
from scrapy.contrib.spiders import Rule
from scrapy.spider import BaseSpider
from scrapy.selector import HtmlXPathSelector
from carrier.items import CarrierItem
class CarrierSpider(InitSpider):
name = 'dis'
allowed_domains = ['qvpweb01.ciq.labs.att.com']
login_page = 'https://qvpweb01.ciq.labs.att.com:8080/dis/login.jsp'
start_urls = ["https://qvpweb01.ciq.labs.att.com:8080/dis/"]
def init_request(self):
#"""This function is called before crawling starts."""
return Request(url=self.login_page, callback=self.login)
def login(self, response):
#"""Generate a login request."""
return FormRequest.from_response(response,
formdata={'txtUserName': 'xxxx', 'txtPassword': 'secret'},
callback=self.check_login_response)
def check_login_response(self, response):
#"""Check the response returned by a login request to see if we aresuccessfully logged in."""
if "logout" in response.body:
self.log("\n\n\nSuccessfully logged in. Let's start crawling!\n\n\n")
# Now the crawling can begin..
return self.initialized()
else:
self.log("\n\n\nFailed, Bad password :(\n\n\n")
# Something went wrong, we couldn't log in, so nothing happens.
def parse(self, response):
self.log("\n\n\n We got data! \n\n\n")
hxs = HtmlXPathSelector(response)
sites = hxs.select('//form[@id=\'listForm\']/table/')
items = []
for site in sites:
item = CarrierItem()
item['title'] = site.select('thead/th/a/text()').extract()
item['link'] = site.select('thead/th/a/@href').extract()
items.append(item)
return items
页面中的 html
<table width="100%" cellspacing="0" cellpadding="2" border="0">
<table width="100%" cellspacing="0" cellpadding="0" border="0">
<tbody>
<tr>
<td valign="top" align="left">
<html>
<html>
<div class="clr"></div>
<table cellspacing="1" cellpadding="0" border="0">
<tbody>
<tr>
<tr>
<td align="left" colspan="2">
<div class="list">
<form id="listForm" name="listForm" method="POST" action="">
<table>
<thead>
<th class="first"></th>
<th>
<a href="/dis/?&orderby=mdn&order=asc">Directory Number</a>
</th>
<th>
<a href="/dis/?&orderby=hardwareId&order=asc">Equipment ID</a>
</th>
<th>
<a href="/dis/?&orderby=subscriberId&order=asc">Subscriber ID</a>
</th>
<th class="arrow_up">
<th>
<a href="/dis/?&orderby=sessUpldTime&order=asc">Session Upload Time</a>
</th>
<th>
<a href="/dis/?&orderby=upldRsn&order=asc">Upload Reason</a>
</th>
<th>
<a href="/dis/?&orderby=prof&order=asc">Profile ID</a>
</th>
<th>
<img width="1" height="1" src="/dis/img/spacer.gif" alt="">
</th>
<th class="last">
<img width="1" height="1" src="/dis/img/spacer.gif" alt="">
</th>
</thead>
<tbody>
</table>
</form>
</div>
</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
运行爬虫时的输出
C:\Users\ye831c\Documents\Big Data\Scrapy\carrier>scrapy crawl dis -o iqDis.csv
-t csv
2013-06-28 14:10:41-0500 [scrapy] INFO: Scrapy 0.16.5 started (bot: carrier)
2013-06-28 14:10:41-0500 [scrapy] DEBUG: Enabled extensions: FeedExporter, LogSt
ats, TelnetConsole, CloseSpider, WebService, CoreStats, SpiderState
2013-06-28 14:10:42-0500 [scrapy] DEBUG: Enabled downloader middlewares: HttpAut
hMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, De
faultHeadersMiddleware, RedirectMiddleware, CookiesMiddleware, HttpCompressionMi
ddleware, ChunkedTransferMiddleware, DownloaderStats
2013-06-28 14:10:42-0500 [scrapy] DEBUG: Enabled spider middlewares: HttpErrorMi
ddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddle
ware
2013-06-28 14:10:42-0500 [scrapy] DEBUG: Enabled item pipelines:
2013-06-28 14:10:42-0500 [dis] INFO: Spider opened
2013-06-28 14:10:42-0500 [dis] INFO: Crawled 0 pages (at 0 pages/min), scraped 0
items (at 0 items/min)
2013-06-28 14:10:42-0500 [scrapy] DEBUG: Telnet console listening on 0.0.0.0:602
3
2013-06-28 14:10:42-0500 [scrapy] DEBUG: Web service listening on 0.0.0.0:6080
2013-06-28 14:10:42-0500 [dis] DEBUG: Crawled (200) <GET https://qvpweb01.ciq.la
bs.att.com:8080/dis/login.jsp> (referer: None)
2013-06-28 14:10:42-0500 [dis] DEBUG: Redirecting (302) to <GET https://qvpweb01
.ciq.labs.att.com:8080/dis/> from <POST https://qvpweb01.ciq.labs.att.com:8080/d
is/login>
2013-06-28 14:10:43-0500 [dis] DEBUG: Crawled (200) <GET https://qvpweb01.ciq.la
bs.att.com:8080/dis/> (referer: https://qvpweb01.ciq.labs.att.com:8080/dis/login
.jsp)
2013-06-28 14:10:43-0500 [dis] DEBUG:
Successfully logged in. Let's start crawling!
2013-06-28 14:10:44-0500 [dis] DEBUG: Crawled (200) <GET https://qvpweb01.ciq.la
bs.att.com:8080/dis/> (referer: https://qvpweb01.ciq.labs.att.com:8080/dis/)
2013-06-28 14:10:44-0500 [dis] DEBUG:
We got data!
2013-06-28 14:10:44-0500 [dis] INFO: Closing spider (finished)
2013-06-28 14:10:44-0500 [dis] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 1382,
'downloader/request_count': 4,
'downloader/request_method_count/GET': 3,
'downloader/request_method_count/POST': 1,
'downloader/response_bytes': 146604,
'downloader/response_count': 4,
'downloader/response_status_count/200': 3,
'downloader/response_status_count/302': 1,
'finish_reason': 'finished',
'finish_time': datetime.datetime(2013, 6, 28, 19, 10, 44, 469000),
'log_count/DEBUG': 12,
'log_count/INFO': 4,
'request_depth_max': 2,
'response_received_count': 3,
'scheduler/dequeued': 4,
'scheduler/dequeued/memory': 4,
'scheduler/enqueued': 4,
'scheduler/enqueued/memory': 4,
'start_time': datetime.datetime(2013, 6, 28, 19, 10, 42, 15000)}
2013-06-28 14:10:44-0500 [dis] INFO: Spider closed (finished)
C:\Users\ye831c\Documents\Big Data\Scrapy\carrier>
最佳答案
问题出在您的 xpath 表达式中，它们应该是相对的 (.//):
item['title'] = site.select('.//thead/th/a/text()').extract()
item['link'] = site.select('.//thead/th/a/@href').extract()
更新:
在聊天中讨论问题后，发现scrapy接收到的页面是页面加载后使用js转换后的xml。
以下内容有助于解析 xml 以获取必要的数据:
def parse(self, response):
xhs = XmlXPathSelector(response)
columns = hxs.select('//table[3]/header/column'')
for column in columns:
item = CarrierItem()
item['title'] = column.select('.//text()').extract()
item['link'] = column.select('.//@uri').extract()
yield item
关于python - 如何使用 scrapy 从具有数据库的网页中提取数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17372194/