python3 爬虫日记(三) 爬取堆糖动态加载网页

1.分析：进入堆糖网后我们在分类找到插画绘画进入这个分类后发现好多图片，下拉后发现会有不断的图片刷新出来，这就是堆糖采用了动态加载网页。

2.用开发者工具(F12)分析：按一下F12，找到network分支，再按一下F5，将刷新后的网页一直往下拉，打开XHR，发现Name下有两个或多个？include开头字段，然后观察Header和Preview发现它的图片信息是json格式的数据。

3.准备开工。

# -*- coding:utf-8 -*-import pymongofrom requests.exceptions import RequestExceptionimport requestsimport jsonfrom urllib.parse import urlencodedef get_index_page(start_page,id_page):    headers = {        'User-Agent': "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/536.3 (KHTML, like Gecko) Chrome/19.0.1061.1 Safari/536.3",        'Referer':'http://www.duitang.com/category/?cat=painting',        'Accept': 'text/plain, */*; q=0.01',        'Host': 'www.duitang.com',        'Accept - Encoding': 'gzip,deflate, sdch',        'Accept - Language': 'zh - CN, zh;q=0.8',        'Connection': 'keep - alive',    }    data = {        'include_fields': 'top_comments,'        'is_root, source_link, item, buyable, root_id, status, like_count, sender, album',        'filter_id': '插画绘画',        'start':start_page,        '_':id_page,    }    url = 'http://www.duitang.com/napi/blog/list/by_filter_id/?' + urlencode(data)# 拼接URL    try:        response = requests.get(url, headers=headers)        if response.status_code == 200:            return response.text        return None    except RequestException:        print('请求索引页出错!')        return Nonedef parse_page_index():    i = 0    n = 1498560199148    while i < 23976:        i = i + 24        n = n + 1        html = get_index_page(i, n)        for n in range(24):            data = json.loads(html.strip())# 将json字典转换为python字典            img_url = data['data']['object_list'][n]['photo']['path']# 获取字典中的图片链接            title = data['data']['object_list'][n]['msg']# 获取字典中的标题            post_sub.insert_one({'img_id': title, 'img_url': img_url})# 插入到数据库中            print(title,img_url)if __name__ == '__main__':    connection = pymongo.MongoClient()    post_info = connection.duitang_painting    post_sub = post_info.duitang    parse_page_index()