python爬虫 下载一个网页内的图片解决分页以及图片懒加载的问题

话不都说,先上代码:

import urllib.parse
import urllib.request
from lxml import etree
import time
import os


def handle_request(url, page):
    headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36',
    }
    # 由于第一页和后面页码规律不一致，所以要进行判断
    if page == 1:
        url = url.format('')
    else:
        url = url.format('_' + str(page))
    # print(url)
    request = urllib.request.Request(url=url,headers=headers)
    return request


def download_image(image_src,i):
    dirpath = 'gudian'
    # 创建一个文件夹
    print('正在下载第'+str(i)+'张图片')
    if not os.path.exists(dirpath):
        os.mkdir(dirpath)
    # 创建文件名
    filename = os.path.basename(str(i)+'.png')
    # 图片路径
    filepath = os.path.join(dirpath, filename)
    print(filepath)
    # 发送请求，保存图片
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36',
    }
    request = urllib.request.Request(url=image_src, headers=headers)
    response = urllib.request.urlopen(request)
    with open(filepath, 'wb') as fp:
        fp.write(response.read())


def parse_content(content):
    # 生成对象
    tree = etree.HTML(content)
    image_list = tree.xpath('//div[@id="f-content"]/div/div/a/img/@data-src')  # //div[@id="container"]/div/div/a/img/@src
    # 懒加载
    print(image_list)
    # print(len(image_list))
    # 遍历列表，依次下载图片
    i = 1
    for image_src in image_list:
        i += 1
        download_image(image_src,i)


def main():
    url = 'http://www.51yuansu.com/search/canyinkatong.html'
    # http://sc.chinaz.com/tupian/gudianmeinvtupian_2.html
    start_page = int(input("请输入开始页码："))
    end_page = int(input("请输入结束页码："))
    for page in range(start_page,end_page+1):
        print("第%s页开始下载······" % page)
        request = handle_request(url, page)
        content = urllib.request.urlopen(request).read().decode()
        # 解析内容
        parse_content(content)
        time.sleep(2)
        print("第%s页下载完毕······" % page)
    print("下载完成！")

if __name__ == "__main__":
    main()

运行结果如图:
我们来看一下网站的目录结构


然后查看网页源代码发现这个懒加载图片的链接地址是存放在data-src当中的 写对应代码
image_list = tree.xpath(’//div[@id=“f-content”]/div/div/a/img/@data-src’) 一个简单的爬虫就实现了 各位想要爬取自己想爬取网页的图片的话 理清目录结构 根据情况修改一下就可以了

本文地址：https://blog.csdn.net/qq_39279425/article/details/109053257