import urllib.request

import os

from urllib import error

import re

import base64

def url_open(url):

    req = urllib.request.Request(url)

    req.add_header('User-Agent','Mozilla/5.0')

    try:

        response = urllib.request.urlopen(req)

    except error.HTTPError:

        print("有异常的url为：" + url)

        return ""

    else:

        html = response.read()

    return html

def get_page(url):

    if 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_image(url):

    image_addrs = []

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

    reg = r'class="img-hash">(.+)</span>'  # 正则表达式

    src_img = re.compile(reg)

    image_addrs_base64 = src_img.findall(html)

    for s in image_addrs_base64:

        image_addrs.append("http:"+ str(base64.b64decode(s).decode('utf-8')))#图片地址是用base64加密

    return image_addrs

def save_image(image_addrs):

    for each in image_addrs:

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

        with open("picture/"+filename,'wb') as f:

            img = url_open(each)

            f.write(img)

def download_girls(pages = 20):

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

    page_num = int(get_page(url))

    for i in range(pages):

        page_num -= 1

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

        image_addrs = find_image(page_url)

        save_image(image_addrs)

if __name__ == '__main__':

    download_girls()

print("执行结束")