异步多线程下载网页爬取的视频

程序改进如下：：：

import requests
import re  # 正则模块
import uuid  # uuid.uuid(4) 可以根据时间戳生成一段世界上唯一的随机字符串

# 导入线程池模块

from concurrent.futures import ThreadPoolExecutor

# 线程（os的资源，一个进程可以开多个线程），但是无法限制好线程数；
# 线程池：帮助控制好线程数

pool = ThreadPoolExecutor(50)


# 爬虫三部曲

# 1、发送请求

def get_page(url):
    print("开始异步任务:{url}")
    response = requests.get(url)
    return response


# 2、解析数据
# 解析主页获取视频详情页ID
def parse_index(res):
    response = res.result()
    res = re.findall('<a href="video_(.*?)', response.text, re.S)
    # print(res)
    # detail_url_list = []
    for m_id in res:
        # 拼接详情页url
        detail_url = 'https://www.pearvideo.com/video_' + m_id
        # 把详情页url提交给get_page
        pool.submit(get_page, detail_url).add_done_callback(parse_detail)
    # detail_url_list.append(detail_url)
    # return detail_url_list


##解析详情页获取视频url
def parse_detail(res):
    response = res.result()

    movie_url = re.findall('srcUrl ="(.*?)" ', response.text, re.S)[0]
    pool.submit(get_page, movie_url).add_done_callback(save_movie)
    # return movie_url


# 3、保存数据

def save_movie(res):
    movie_res = res.result()

    # # 把视频写到本地


with open(f'{uuid.uuid4()}.mp4', 'wb') as f:
    f.write(movie_res.content)
    f.flush()

# 测试：调用函数并实现爬取

if __name__ == '__main__':  # mian+回车键

    # 往get_page发送异步请求，把结果交给parse_index
    url = 'https://www.pearvideo.com/'
    pool.submit(get_page, url).add_done_callback(parse_index)  # 异步提交

 执行代码如下：

import requests
import re  # 正则模块
import uuid  # uuid.uuid(4) 可以根据时间戳生成一段世界上唯一的随机字符串

# 导入线程池模块

from concurrent.futures import ThreadPoolExecutor

# 线程（os的资源，一个进程可以开多个线程），但是无法限制好线程数；
# 线程池：帮助控制好线程数

pool = ThreadPoolExecutor(50)


# 爬虫三部曲

# 1、发送请求

def get_page(url):
    print("开始异步任务:{url}")
    response = requests.get(url)
    return response


# 2、解析数据
# 解析主页获取视频详情页ID
def parse_index(res):
    response = res.result()
    res1= re.findall('<a href="video_(.*?)"', response.text, re.S)
    print(res1)
    # detail_url_list = []
    for m_id in res1:
        # 拼接详情页url
        detail_url = 'https://www.pearvideo.com/video_' + m_id
       # print(detail_url)
        # 把详情页url提交给get_page
        pool.submit(get_page, detail_url).add_done_callback(parse_detail)
    # detail_url_list.append(detail_url)
    # return detail_url_list
#
#
##解析详情页获取视频url
def parse_detail(res):
    response = res.result()
    print(response.text)
    movie_url = re.findall('srcUrl="(.*?)" ', response.text, re.S)[0]
    print(movie_url)
    pool.submit(get_page, movie_url).add_done_callback(save_movie)
    # return movie_url


# 3、保存数据

def save_movie(res):
    movie_res=res.result()

    # # 把视频写到本地


    with open(f'{uuid.uuid4()}.mp4', 'wb') as f:
        f.write(movie_res.content)
        f.flush()

# 测试：调用函数并实现爬取

if __name__ == '__main__':  # mian+回车键

    # 往get_page发送异步请求，把结果交给parse_index
    url = 'https://www.pearvideo.com/'
    pool.submit(get_page, url).add_done_callback(parse_index)  # 异步提交
   # print(pool.submit(get_page, url))

　　

数据传递过程，如下几图：