羌戎🌱笔记

羌戎🌱笔记

国家中小学智慧教育平台电子教材全套下载

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整体思路:

第一步:抓取所有的电子教材下载链接,输出到txt文本文件

book_list.py

Python

import requests

# https://s-file-1.ykt.cbern.com.cn/zxx/ndrs/resources/tch_material/version/data_version.json

urls = [
    'https://s-file-2.ykt.cbern.com.cn/zxx/ndrs/resources/tch_material/part_100.json',
    'https://s-file-2.ykt.cbern.com.cn/zxx/ndrs/resources/tch_material/part_101.json',
    'https://s-file-2.ykt.cbern.com.cn/zxx/ndrs/resources/tch_material/part_102.json',
]


def book_list():
    responses = [requests.get(url).json() for url in urls]

    result = []
    for response in responses:
        result.extend(response)

    file_contents = ''
    for item in result:
        if len(item['tag_paths']) <= 0:
            continue
        tags = [
            next((tag['tag_name'] for tag in item['tag_list'] if tag['tag_id'] == id), '')
            for id in item['tag_paths'][0].split('/')
        ]
        directory = '/'.join(tags)
        file_url = f"https://r2-ndr.ykt.cbern.com.cn/edu_product/esp/assets_document/{item['id']}.pkg/pdf.pdf"
        output = f"out={directory}/{item['title']}.pdf".replace(' ', '')
        file_contents += f"{file_url}n  {output}n"

    with open('book_list.txt', 'w', encoding='utf-8') as file:
        file.write(file_contents)


if __name__ == '__main__':
    book_list()

第二步:读取文本文件,开启多线程下载

book_download.py

Python

import os
import re
import requests

file_name = 'book_list.txt'
download_dir = './'

'''example
https://r2-ndr.ykt.cbern.com.cn/edu_product/esp/assets_document/bdc00134-465d-454b-a541-dcd0cec4d86e.pkg/pdf.pdf
  out=教材/电子教材/小学/道德与法治/统编版/一年级/上册/义务教育教科书·道德与法治一年级上册.pdf
'''


def get_links(file_name):
    with open(file_name, 'r', encoding='utf-8') as f:
        data = f.read()

    pattern = re.compile(r'(httpsS+)ns+out=([^n]+)')
    matches = pattern.findall(data)

    for match in matches:
        yield match


def download(link, path, session=requests.Session()):
    download_dir_name = os.path.join(download_dir, path)
    if not os.path.exists((os.path.dirname(download_dir_name))):
        os.makedirs(os.path.dirname(download_dir_name))

    with session.get(link, stream=True) as r:
        with open(download_dir_name, 'wb') as f:
            r.raw.decode_content = True
            downloaded_size = 0
            for chunk in r.iter_content(chunk_size=1024 * 1024 * 1024):
                f.write(chunk)
                downloaded_size += len(chunk)
                print(download_dir_name.split('/')[-1], downloaded_size, '/', r.headers['Content-Length'], end='r')


if __name__ == '__main__':
    import threading

    sub_threads = threading.Semaphore(8)


    def download_thread(link, path):
        sub_threads.acquire()
        print('Download: ', path, link, end='n')
        download(link, path)
        sub_threads.release()
        print('Done: ', path, end='n')


    for link, path in get_links(file_name):
        t = threading.Thread(target=download_thread, args=(link, path))
        t.start()

最后,下载完毕总大小44G,总文件数2300。

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