分析Ajax爬取今日头条街拍美图

 1 import os
 2 import requests
 3 from urllib.parse import urlencode
 4 from hashlib import md5
 5 from multiprocessing.pool import Pool
 6
 7 GROUP_START = 1
 8 GROUP_END = 5
 9
10 def get_page(offset):
11     params = {
12         ‘offset‘: offset,
13         ‘format‘: ‘json‘,
14         ‘keyword‘: ‘街拍‘,
15         ‘autoload‘: ‘true‘,
16         ‘count‘: ‘20‘,
17         ‘cur_tab‘: ‘3‘,
18         ‘from‘: ‘gallery‘,
19     }
20     url = ‘https://www.toutiao.com/search_content/?‘ + urlencode(params)
21     try:
22         response = requests.get(url)
23         if response.status_code == 200:
24             return response.json()
25     except requests.ConnectionError:
26         return None
27
28 def get_images(json):
29     data = json.get(‘data‘)
30     if data:
31         for item in data:
32             # print(item)
33             image_list = item.get(‘image_list‘)
34             title = item.get(‘title‘)
35             # print(image_list)
36             for image in image_list:
37                 yield {
38                     ‘image‘: image.get(‘url‘),
39                     ‘title‘: title
40                 }
41
42 def save_image(item):
43     if not os.path.exists(item.get(‘title‘)):
44         os.mkdir(item.get(‘title‘))
45     try:
46         local_image_url = item.get(‘image‘)
47         new_image_url = local_image_url.replace(‘list‘,‘large‘)
48         response = requests.get(‘http:‘ + new_image_url)
49         if response.status_code == 200:
50             file_path = ‘{0}/{1}.{2}‘.format(item.get(‘title‘), md5(response.content).hexdigest(), ‘jpg‘)
51             if not os.path.exists(file_path):
52                 with open(file_path, ‘wb‘)as f:
53                     f.write(response.content)
54             else:
55                 print(‘Already Downloaded‘, file_path)
56     except requests.ConnectionError:
57         print(‘Failed to save image‘)
58
59 def main(offset):
60     json = get_page(offset)
61     for item in get_images(json):
62         print(item)
63         save_image(item)
64
65 if __name__ == ‘__main__‘:
66     pool = Pool()
67     groups = ([x * 20 for x in range(GROUP_START, GROUP_END + 1)])
68     pool.map(main, groups)
69     pool.close()
70     pool.join()

原文地址：https://www.cnblogs.com/wanglinjie/p/9123226.html