爬虫===登陆CSDN的方法

本文主要介绍csdn的登陆，可应用在爬虫上~

# -*- coding:utf-8 -*-  

import json
import requestsfrom xlutils.copy import copy
from bs4 import BeautifulSoup
session = requests.session()
url = 'https://passport.csdn.net/account/login?from=http://my.csdn.net/my/mycsdn'

def get_post_headers():
    return {
        'Host': 'passport.csdn.net',
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0',
        'Accept-Encoding': 'gzip, deflate, br',
        'Accept-Language': 'zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3',
        'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
        'Connection': 'keep-alive',
        'Referer': 'http://www.csdn.net/'
        }

def get_post_data():
    '''登陆参数'''
    username = "你的账号"
    password = "你的密码"

　　# 提取lt, execution, _eventId （这几个参数是必须的）
    login_page = session.get(url, headers=get_post_headers()).text
    soup = BeautifulSoup(login_page, 'html.parser')   

    lt = soup.find(attrs={'name': 'lt'})['value']

    execution = soup.find(attrs={'name': 'execution'})['value']

    submit = soup.find(attrs={'name': '_eventId'})['value']

    return dict(username =username,password = password, lt = lt,execution = execution, _eventId = submit )

def login(post_data):
    session.post(url ,data = post_data, headers = get_post_headers())
    return session

if __name__ == '__main__':

    session = login(get_post_data())
    home_page = 'http://my.csdn.net/my/mycsdn'
    # 这里headers不能用前面那个，因为Host等参数发生改变了，否则会出现500状态码
    headers = {
        'Host': 'my.csdn.net',
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0',
        'Upgrade-Insecure-Requests': '',
        'Accept': 'Accept'
    }
    resp = session.get(home_page, headers=headers)
    #print(resp.text)

    r = session.get(url = "http://mp.blog.csdn.net/postedit")
    print(r.text)
    soup_write = BeautifulSoup(r.text, 'html5lib')
　　
　　#检查是否正的进入了编写文章的界面
    title =  soup_write.find(attrs={'id': 'txtTitle'})['placeholder']
    print(title)