python 爬取百度文库并下载(免费文章限定)

import requests
import re
import json
import os

session = requests.session()

def fetch_url(url):
return session.get(url).content.decode('gbk')

def get_doc_id(url):
return re.findall('view/(.*).html', url)[0]

def parse_type(content):
return re.findall(r"docType.*?\:.*?\'(.*?)\'\,", content)[0]

def parse_title(content):
return re.findall(r"title.*?\:.*?\'(.*?)\'\,", content)[0]

def parse_doc(content):
result = ''
url_list = re.findall('(https.*?0.json.*?)\\\\x22}', content)
url_list = [addr.replace("\\\\\\/", "/") for addr in url_list]
for url in url_list[:-5]:
 content = fetch_url(url)
 y = 0
 txtlists = re.findall('"c":"(.*?)".*?"y":(.*?),', content)
 for item in txtlists:
  if not y == item[1]:
   y = item[1]
   n = '\n'
  else:
   n = ''
  result += n
  result += item[0].encode('utf-8').decode('unicode_escape', 'ignore')
return result

def parse_txt(doc_id):
content_url = 'https://wenku.baidu.com/api/doc/getdocinfo?callback=cb&doc_id=' + doc_id
content = fetch_url(content_url)
md5 = re.findall('"md5sum":"(.*?)"', content)[0]
pn = re.findall('"totalPageNum":"(.*?)"', content)[0]
rsign = re.findall('"rsign":"(.*?)"', content)[0]
content_url = 'https://wkretype.bdimg.com/retype/text/' + doc_id + '?rn=' + pn + '&type=txt' + md5 + '&rsign=' + rsign
content = json.loads(fetch_url(content_url))
result = ''
for item in content:
 for i in item['parags']:
  result += i['c'].replace('\\r', '\r').replace('\\n', '\n')
return result

def parse_other(doc_id):
content_url = "https://wenku.baidu.com/browse/getbcsurl?doc_id=" + doc_id + "&pn=1&rn=99999&type=ppt"
content = fetch_url(content_url)
url_list = re.findall('{"zoom":"(.*?)","page"', content)
url_list = [item.replace("\\", '') for item in url_list]
if not os.path.exists(doc_id):
 os.mkdir(doc_id)
for index, url in enumerate(url_list):
 content = session.get(url).content
 path = os.path.join(doc_id, str(index) + '.jpg')
 with open(path, 'wb') as f:
  f.write(content)
print("图片保存在" + doc_id + "文件夹")

def save_file(filename, content):
with open(filename, 'w', encoding='utf8') as f:
 f.write(content)
 print('已保存为:' + filename)

# test_txt_url = 'https://wenku.baidu.com/view/cbb4af8b783e0912a3162a89.html?from=search'
# test_ppt_url = 'https://wenku.baidu.com/view/2b7046e3f78a6529657d5376.html?from=search'
# test_pdf_url = 'https://wenku.baidu.com/view/dd6e15c1227916888586d795.html?from=search'
# test_xls_url = 'https://wenku.baidu.com/view/eb4a5bb7312b3169a551a481.html?from=search'
def main():
url = input('请输入要下载的文库URL地址')
content = fetch_url(url)
doc_id = get_doc_id(url)
type = parse_type(content)
title = parse_title(content)
if type == 'doc':
 result = parse_doc(content)
 save_file(title + '.txt', result)
elif type == 'txt':
 result = parse_txt(doc_id)
 save_file(title + '.txt', result)
else:
 parse_other(doc_id)

if __name__ == "__main__":
main()

爬取结果

来源：https://github.com/Jack-Cherish/python-spider