Python3 爬蟲帶上 cookie

Cookie的英文原意是“點心”，它是在客戶端訪問Web伺服器時，伺服器在客戶端硬碟上存放的信息，好像是伺服器發送給客戶的“點心」。伺服器可以根據Cookie來追蹤客戶狀態，這對於需要區別客戶的場合（如電子商務）特別有用。

當客戶端首次要求存取伺服器時，伺服器先在客戶端存放包含該客戶的相關資訊的Cookie，以後客戶端每次要求存取伺服器時，都會在HTTP請求資料中包含Cookie，伺服器解析HTTP請求中的Cookie，就能因此獲得關於客戶的相關資訊。

下面我們就來看python3爬蟲帶上cookie的方法：

1、直接將Cookie寫在header頭部

# coding:utf-8
import requests
from bs4 import BeautifulSoup
cookie = '''cisession=19dfd70a27ec0eecf1fe3fc2e48b7f91c7c83c60;CNZZDATA1000201968=181584
6425-1478580135-https%253A%252F%252Fwww.baidu.com%252F%7C1483922031;Hm_lvt_f805f7762a9a2
37a0deac37015e9f6d9=1482722012,1483926313;Hm_lpvt_f805f7762a9a237a0deac37015e9f6d9=14839
26368'''
header = {
'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Geck
o) Chrome/53.0.2785.143 Safari/537.36',
'Connection': 'keep-alive',
'accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
'Cookie': cookie}
url = 'https://www.jb51.net/article/191947.htm'
wbdata = requests.get(url,headers=header).text
soup = BeautifulSoup(wbdata,'lxml')
print(soup)

2、使用requests插入Cookie

# coding:utf-8
import requests
from bs4 import BeautifulSoup
cookie = {
"cisession":"19dfd70a27ec0eecf1fe3fc2e48b7f91c7c83c60",
"CNZZDATA100020196":"1815846425-1478580135-https%253A%252F%252Fwww.baidu.com%252F%7C1483
922031",
"Hm_lvt_f805f7762a9a237a0deac37015e9f6d9":"1482722012,1483926313",
"Hm_lpvt_f805f7762a9a237a0deac37015e9f6d9":"1483926368"
}
url = 'https://www.jb51.net/article/191947.htm'
wbdata = requests.get(url,cookies=cookie).text
soup = BeautifulSoup(wbdata,'lxml')
print(soup)

實例擴充：

使用cookie登入哈工大ACM網站

取得網站登入位址

##http:// acm.hit.edu.cn/hoj/system/login

查看要傳送的post資料

user和password

Code:

#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
__author__ = 'pi'
__email__ = 'pipisorry@126.com'

"""
import urllib.request, urllib.parse, urllib.error
import http.cookiejar

LOGIN_URL = 'http://acm.hit.edu.cn/hoj/system/login'
values = {'user': '******', 'password': '******'} # , 'submit' : 'Login'
postdata = urllib.parse.urlencode(values).encode()
user_agent = r'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36'
headers = {'User-Agent': user_agent, 'Connection': 'keep-alive'}

cookie_filename = 'cookie.txt'
cookie = http.cookiejar.MozillaCookieJar(cookie_filename)
handler = urllib.request.HTTPCookieProcessor(cookie)
opener = urllib.request.build_opener(handler)

request = urllib.request.Request(LOGIN_URL, postdata, headers)
try:
  response = opener.open(request)
  page = response.read().decode()
  # print(page)
except urllib.error.URLError as e:
  print(e.code, ':', e.reason)

cookie.save(ignore_discard=True, ignore_expires=True) # 保存cookie到cookie.txt中
print(cookie)
for item in cookie:
  print('Name = ' + item.name)
  print('Value = ' + item.value)

get_url = 'http://acm.hit.edu.cn/hoj/problem/solution/?problem=1' # 利用cookie请求訪问还有一个网址
get_request = urllib.request.Request(get_url, headers=headers)
get_response = opener.open(get_request)
print(get_response.read().decode())
# print('You have not solved this problem' in get_response.read().decode())

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