爬虫下载网页pdf文件

import os
import requests
from bs4 import BeautifulSoup
from urllib.parse import urljoin
from urllib.parse import urljoin, unquote
from tqdm import tqdm
# 设置网页的URL
base_url = "http://119/download/dzz/pdf/"

# 创建保存文件的文件夹，如果文件夹不存在则创建
download_folder = "downloaded_pdfs"
os.makedirs(download_folder, exist_ok=True)

def get_name(base_url):
    name_list=[]
    # 获取网页内容
    response = requests.get(base_url)  # 发送请求获取网页内容
    response.raise_for_status()  # 检查请求是否成功，若不成功则抛出异常
    soup = BeautifulSoup(response.text, "html.parser")  # 解析HTML内容

    # 查找所有文件链接
    for link in soup.find_all("a"):  # 遍历网页中所有的<a>标签，找到每个链接
        name_list.append(link.get("href"))
    return name_list
f1_list=get_name(base_url)
for i1 in f1_list:
    if i1 and i1 not in ["../"]:
        print(i1)
        f1_url = urljoin(base_url, i1)  # 将相对链接转为完整的URL
        f2_list=get_name(f1_url)
        for i2 in f2_list:   
            if i2 and i2 not in ["../"]:
                f2_url = urljoin(f1_url, i2)  # 将相对链接转为完整的URL
                f3_list=get_name(f2_url)
                for i3 in tqdm(f3_list):   
                    if i3 and i3 not in ["../"]:
                        f3_url = urljoin(f2_url, i3)  # 将相对链接转为完整的URL
                        response = requests.get(f3_url)  # 发送请求获取网页内容
                        response.raise_for_status()  # 检查请求是否成功，若不成功则抛出异常
                        

                        file_response = requests.get(f3_url)  # 发送请求下载文件内容

                        download_folder_new = download_folder+'/'+i1+i2
                        download_folder_new=unquote(download_folder_new)
                        os.makedirs(download_folder_new, exist_ok=True)
                        download_folder_path=download_folder_new+i3
                        download_folder_path = unquote(download_folder_path)
                        with open(download_folder_path, "wb") as f:  # 以二进制写入方式保存文件
                            f.write(file_response.content)  # 写入下载的文件内容到本地
                        # print(f"{download_folder_path}下载完成")  # 打印下载完成信息