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用到的知识点

1、cookie

　　a. from scrapy.http.cookies import CookieJar #用这个包获取第一次访问时的cookie

　　 b、cookie_odj = CookieJar() #实例化对象

　　　　cookie_odj.extract_cookies(response,response.request)

　　　　cookie_dict = cookie_odj._cookies #获取cookie  
2、Request 传参

yield scrapy.Request(
    url="https://dig.chouti.com/login", #地址
    method="POST",　　　　　　　　　　　　　　#请求方式
    body="phone=8619923803579&password=140709ben&oneMonth=1", #请求体
    headers={"Content-Type":"application/x-www-form-urlencoded; charset=UTF-8"},#请求头
    cookies=cookies_dict,　　#cookie
    callback=self.check_log, #回调函数
)

示例：

 1 # -*- coding: utf-8 -*-
 2 import scrapy
 3 from scrapy.http.cookies import CookieJar  # 用这个包获取第一次访问时的cookie
 4 
 5 
 6 class CtiSpider(scrapy.Spider):
 7     name = 'cti'
 8     allowed_domains = ['dig.chouti.com']
 9     start_urls = ['http://dig.chouti.com/']
10     cookies_dict = None  # 保存好的cookie方便其它方法调用
11 
12     def parse(self, response):
13         cookie_odj = CookieJar()  # 实例化对象
14         cookie_odj.extract_cookies(response, response.request)
15         self.cookies_dict = cookie_odj._cookies
16 
17         yield scrapy.Request(
18             url="https://dig.chouti.com/login",
19             method="POST",
20             body="phone=8619923803579&password=0709ben&oneMonth=1",
21             headers={"Content-Type": "application/x-www-form-urlencoded; charset=UTF-8"},
22             cookies=self.cookies_dict,
23             callback=self.check_log,
24         )
25 
26     def check_log(self, response):
27 
28         yield scrapy.Request(url="https://dig.chouti.com/", callback=self.good)
29 
30     def good(self, response):
31         url_list = response.xpath("//div[@share-linkid]/@share-linkid").extract()
32         for i in url_list:
33             good_url = "https://dig.chouti.com/link/vote?linksId=%s" % i
34 
35             yield scrapy.Request(
36                 url=good_url,
37                 method="POST",
38                 cookies=self.cookies_dict,
39                 callback=self.check_good
40             )
41 
42         pages_list = response.xpath("//div[@id='page-area']//a/@href").extract()
43         for a in pages_list:
44             page_url = "https://dig.chouti.com%s" % a
45 
46             yield scrapy.Request(url=page_url, callback=self.good)
47 
48     def check_good(self, response):
49         print(response.text)

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