Python 爬虫爬取煎蛋网图片

今天，试着爬取了煎蛋网的图片。

用到的包：

urllib.request

分别使用几个函数，来控制下载的图片的页数，获取图片的网页，获取网页页数以及保存图片到本地。过程简单清晰明了

直接上源代码：

import urllib.request

import os

def url_open(url):

    req = urllib.request.Request(url)

    req.add_header('user-agent','Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36')

    response = urllib.request.urlopen(url)

    html = response.read()

    return html

def get_page(url):

    html = url_open(url).decode('utf-8')

    a = html.find('current-comment-page')+23

    b = html.find(']',a)

    return html[a:b]

def find_imgs(url):

    html = url_open(url).decode('utf-8')

    img_addrs = []

    a = html.find('img src=')

    while a != -1:

        b = html.find('.jpg',a ,a+255)

        if b != -1:

            img_addrs.append('https:'+html[a+9:b+4]) # 'img src='为9个偏移  '.jpg'为4个偏移

        else:

            b = a+9

        a = html.find('img src=', b)

    return img_addrs

def save_imgs(folder, img_addrs):

    for each in img_addrs:

        filename = each.split('/')[-1]

        with open(filename, 'wb') as f:

            img = url_open(each)

            f.write(img)

        print(img_addrs)

def download_mm(folder = 'xxoo', pages = 5):

    os.mkdir(folder)

    os.chdir(folder)

    url = 'http://jandan.net/ooxx/'

    page_num = int(get_page(url))

    for i in range(pages):

        page_num -= i

        page_url = url + 'page-'+ str(page_num) + '#comments'

        img_addrs = find_imgs(page_url)

        save_imgs(folder, img_addrs)

if __name__ == '__main__':

    download_mm()