介绍下3种python获取cookie的方法。

（1）借助handler

这种方法也是网上介绍最多的一种方法，但是用起来比较麻烦

from http import cookiejar

from urllib import request

 

class Craw():

    def __init__(self):

        self.url = ''

        self.headers['User-Agent'] = 'Mozilla/5.0 (Windows NT 6.3; Win64; x64) ' \

                                     'AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36'

        self.headers['Content-Type'] = 'application/x-www-form-urlencoded'

 

    def getCookies(self):

        cookie = cookiejar.CookieJar()

        handler = request.HTTPCookieProcessor(cookie)

        opener = request.build_opener(handler)

        response = opener.open(self.url)

        cookieValue = ''

        for item in cookie:

            cookieValue += item.name + '=' + item.value + ';'

        self.headers['Cookie'] = cookieValue

        response = requests.get(url=self.url)

  

    def getVerificationCode(self):

　　　　　img_url = ''

        imgResponse = requests.get(url=img_url,headers = self.headers) #直接使用headers即可

        base64_jpg = base64.b64encode(imgResponse.content)

        return base64_jpg

（2）使用response headers的set_cookie

import requests

import re

class Crawler():

　  def getCookie(self):

　　 　 response = requests.post(self.url)

　　　　set_cookie = response.headers['Set-Cookie']

　　　　array = re.split('[;,]',set_cookie)

　　　　cookieValue = ''

　　　　for arr in array:

　　　　　　if arr.find('DZSW_SESSIONID') >= 0 or arr.find('bl0gm1HBTB') >= 0:

　　　　　　　　cookieValue += arr + ';'

（3）使用response的cookies属性获取

只写getCookies方法，代码如下：

import requests    

class Crawler():

    def getCookie(self):

        response = requests.get(self.url)

        cookie_value = ''

        for key,value in response.cookies.items():  

            cookie_value += key + '=' + value + ';'  

        self.headers['Cookie'] = cookie_value