问题
I have coded a Scrapy spider using the loginform library (http://blog.scrapinghub.com/2012/10/26/filling-login-forms-automatically/) and taking this post as reference for dynamic webpages. This is the code:
class MySpider(CrawlSpider):
login_user = 'myusername'
login_pass = 'mypassword'
name = "tv"
allowed_domains = []
start_urls = ["https://twitter.com/Acrocephalus/followers"]
rules = (
Rule(SgmlLinkExtractor(allow=('https://twitter\.com/.*')), callback='parse_items', follow=True),
)
def parse(self, response):
args, url, method = fill_login_form(response.url, response.body, self.login_user, self.login_pass)
return FormRequest(url, method=method, formdata=args, callback=self.after_login)
def after_login(self, response):
# you are logged in here
def __init__(self):
CrawlSpider.__init__(self)
# use any browser you wish
self.browser = webdriver.Firefox()
def __del__(self):
self.browser.close()
def parse_item(self, response):
item = TwitterVizItem()
self.browser.get(response.url)
# let JavaScript Load
time.sleep(3)
# scrape dynamically generated HTML
hxs = Selector(text=self.browser.page_source)
item['Follower'] = hxs.select('(//span[@class="u-linkComplex-target"])[position()>2]').extract()
item['Follows'] = hxs.select('(//span[@class="u-linkComplex-target"])[position()=1]').extract()
return item
When I run it, I get this output:
2015-07-22 18:46:38 [scrapy] INFO: Scrapy 1.0.1.post1+g5b8c9e5 started (bot: TwitterViz)
2015-07-22 18:46:38 [scrapy] INFO: Optional features available: ssl, http11
2015-07-22 18:46:38 [scrapy] INFO: Overridden settings: {'NEWSPIDER_MODULE': 'TwitterViz.spiders', 'SPIDER_MODULES': ['TwitterViz.spiders'], 'BOT_NAME': 'TwitterViz'}
2015-07-22 18:46:38 [scrapy] INFO: Enabled extensions: CloseSpider, TelnetConsole, LogStats, CoreStats, SpiderState
2015-07-22 18:46:38 [scrapy] INFO: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, MetaRefreshMiddleware, HttpCompressionMiddleware, RedirectMiddleware, CookiesMiddleware, ChunkedTransferMiddleware, DownloaderStats
2015-07-22 18:46:38 [scrapy] INFO: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware
2015-07-22 18:46:38 [scrapy] INFO: Enabled item pipelines:
2015-07-22 18:46:38 [scrapy] INFO: Spider opened
2015-07-22 18:46:38 [scrapy] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2015-07-22 18:46:38 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6023
2015-07-22 18:46:39 [scrapy] DEBUG: Redirecting (302) to <GET https://twitter.com/login?redirect_after_login=%2FAcrocephalus%2Ffollowers> from <GET https://twitter.com/Acrocephalus/followers>
2015-07-22 18:46:39 [scrapy] DEBUG: Crawled (200) <GET https://twitter.com/login?redirect_after_login=%2FAcrocephalus%2Ffollowers> (referer: None)
2015-07-22 18:46:39 [scrapy] DEBUG: Redirecting (302) to <GET https://twitter.com/Acrocephalus/followers> from <POST https://twitter.com/sessions>
2015-07-22 18:46:40 [scrapy] DEBUG: Crawled (200) <GET https://twitter.com/Acrocephalus/followers> (referer: https://twitter.com/login?redirect_after_login=%2FAcrocephalus%2Ffollowers)
2015-07-22 18:46:40 [scrapy] INFO: Closing spider (finished)
2015-07-22 18:46:40 [scrapy] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 2506,
'downloader/request_count': 4,
'downloader/request_method_count/GET': 3,
'downloader/request_method_count/POST': 1,
'downloader/response_bytes': 63188,
'downloader/response_count': 4,
'downloader/response_status_count/200': 2,
'downloader/response_status_count/302': 2,
'finish_reason': 'finished',
'finish_time': datetime.datetime(2015, 7, 22, 16, 46, 40, 538785),
'log_count/DEBUG': 5,
'log_count/INFO': 7,
'request_depth_max': 1,
'response_received_count': 2,
'scheduler/dequeued': 4,
'scheduler/dequeued/memory': 4,
'scheduler/enqueued': 4,
'scheduler/enqueued/memory': 4,
'start_time': datetime.datetime(2015, 7, 22, 16, 46, 38, 926487)}
2015-07-22 18:46:40 [scrapy] INFO: Spider closed (finished)
From the ouput I understand that it logs in properly. However, it doesn't scrap anything. I've tested the XPath with Firefox's XPath Checker and they seem to work properly. Can anyone have a look to see if we can find what is wrong?
来源：https://stackoverflow.com/questions/31568395/how-to-scrap-data-in-an-authenticated-session-within-a-dynamic-page