登录界面

京东的登录表单设置了许多隐藏字段，如下所示：

隐藏字段

所以都要获取下来。

同样也是输错三次之后出现authcode。

验证码

import requests
from bs4 import BeautifulSoup
import time

try:
    input = raw_input
except:
    pass

class JDlogin(object):
    def __init__(self,un,pw):
        self.headers = {'User-Agent':"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; AcooBrowser; .NET CLR 1.1.4322; .NET CLR 2.0.50727)",
                        'Accept':'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
                        'Accept-Encoding':'gzip, deflate, sdch',
                        'Accept-Language':'zh-CN,zh;q=0.8',
                        'Connection':'keep-alive',
                        }
        self.session = requests.session()
        self.login_url = "http://passport.jd.com/uc/login"
        self.post_url = "http://passport.jd.com/uc/loginService"
        self.auth_url = "https://passport.jd.com/uc/showAuthCode"
        self.un = un
        self.pw = pw

    def get_authcode(self,url):
        self.headers['Host'] = 'authcode.jd.com'
        self.headers['Referer'] = 'https://passport.jd.com/uc/login'
        response = self.session.get(url, headers = self.headers)
        with open('authcode.jpg','wb') as f:
            f.write(response.content)
        authcode = input("plz enter authcode:")
        return authcode

    def get_info(self):
        '''获取登录相关参数'''
        try:
            page = self.session.get(self.login_url, headers = self.headers )
            soup = BeautifulSoup(page.text,"lxml")
            input_list = soup.select('.form input')

            data = {}
            data['uuid'] = input_list[0]['value']
            data['eid'] = input_list[4]['value']
            data['fp'] = input_list[5]['value']
            data['_t'] = input_list[6]['value']
            rstr = input_list[7]['name']
            data[rstr] = input_list[7]['value']
            acRequired = self.session.post(self.auth_url, data={'loginName':self.un}).text #返回({"verifycode":true})或({"verifycode":false})

            if 'true' in acRequired:
                print ('need authcode, plz find it and fill in ')
                acUrl = soup.select('.form img')[0]['src2']
                acUrl = 'http:{}&yys={}'.format(acUrl,str(int(time.time()*1000)))
                authcode = self.get_authcode(acUrl)
                data['authcode'] = authcode
            else:
                data['authcode'] = ''

        except Exception as e:
            print (e)
        finally:
            return data
    def login(self):
        
        postdata = self.get_info()
        postdata['loginname'] = self.un
        postdata['nloginpwd'] = self.pw
        postdata['loginpwd'] = self.pw
        try:
            self.headers['Host'] = 'passport.jd.com'
            self.headers['Origin'] = 'https://passport.jd.com'
            self.headers['X-Requested-With'] = 'XMLHttpRequest'
            login_page = self.session.post(self.post_url, data = postdata, headers = self.headers)
            print (login_page.text)  #若返回{“success”:”http://www.jd.com”}，说明登录成功
        except Exception as e:
            print (e)

if __name__=="__main__":
    username = input("plz enter username:")
    password = input("plz enter password:")
    JD = JDlogin(username,password)
    JD.login()