小甲鱼课程56，爬虫ooxx问题,萌新交流区,萌新训练营,鱼C论坛

刘诗杰 发表于 2017-9-8 11:00:37

小甲鱼课程56，爬虫ooxx问题

import urllib.request
import os

def url_open(url):
req = urllib.request.Request(url)
req.add_header('User-Agent','Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36')
response = urllib.request.urlopen(req)
html= response.read()

return html

def get_page(url):

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

a = html.find('current-comment-page') + 23
b = html.find(']',a)

return html

def find_imgs(url):
html = url_open(url).decode('utf-8')
img_addrs =[]
a = html.find('img src=')

while a !=-1:
   b = html.find('.jpg',a, a+255)
   if b!=-1:
         img_addrs.append(html)
   else:
         b = a + 9

   a =html.find('img src=', b)
return img_addrs

def save_imgs(folder,img_addrs):
for each in img_addrs:
   print(each)
   filename = each.split('/')[-1]
   with open('filename', 'wb') as f:
         img = url_open(each)
         f.write(img)

def download_mm(folder="OOXX",pages =10):
os.mkdir(folder)
os.chdir(folder)

url ="http://jandan.net/ooxx/"
page_num =int(get_page(url))

for i in range(pages):
   page_num -= i
   page_url =url +'page-' + str(page_num) + '#comments'
   img_addrs =find_imgs(page_url)
   save_imgs(folder,img_addrs)

if __name__ =="__main__":
download_mm()

出现问题
//wx1.sinaimg.cn/mw600/661eb95cgy1fj8gtap5ldj20dw0k075l.jpg
Traceback (most recent call last):
File "C:\Users\Administrator\Desktop\python\下载XXOO\test.py", line 69, in <module>
download_mm()
File "C:\Users\Administrator\Desktop\python\下载XXOO\test.py", line 64, in download_mm
save_imgs(folder,img_addrs)
File "C:\Users\Administrator\Desktop\python\下载XXOO\test.py", line 49, in save_imgs
img = url_open(each)
File "C:\Users\Administrator\Desktop\python\下载XXOO\test.py", line 6, in url_open
req = urllib.request.Request(url)
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python35\lib\urllib\request.py", line 269, in __init__
self.full_url = url
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python35\lib\urllib\request.py", line 295, in full_url
self._parse()
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python35\lib\urllib\request.py", line 324, in _parse
raise ValueError("unknown url type: %r" % self.full_url)
ValueError: unknown url type: '//wx1.sinaimg.cn/mw600/661eb95cgy1fj8gtap5ldj20dw0k075l.jpg'
>>>
求解答

ba21 发表于 2017-9-8 11:12:06

import urllib.request
import sys
import os

def url_open(url):
req = urllib.request.Request(url)
req.add_header('User-Agent',
               'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36')
resp = urllib.request.urlopen(url)
html = resp.read()
# print(html)
return html

def get_page(url):# 获取图片页码
html = url_open(url).decode('utf-8')# 解码，之后查找图片页码做准备
a = html.find('current-comment-page') + 23# 返回页码数的首位置
b = html.find(']', a)# 返回页码数的末位置
# print(html)
return html# 拼接返回页码

def find_imgs(url):# 在当前URL查找图片
html = url_open(url).decode('utf-8')
img_addrs = []

a = html.find('img src=')# 图片真实地址

while a != -1:
   b = html.find('.jpg', a, a + 200)
   if b != -1:
         img_addrs.append(html)
   else:
         b = a + 9

   a = html.find('img src=', b)
return img_addrs

def save_imgs(img_addrs):
for each in img_addrs:
   filename = each.split('/')[-1]
   with open(filename, 'wb') as f:
         img = url_open("http:"+each)
         f.write(img)

def download(folder='Girls', pages=20):
os.mkdir(folder)# 创建文件夹
os.chdir(folder)# 切换到文件夹目录

url = 'http://jandan.net/ooxx'
page_num = int(get_page(url))# 获取当前该图片页码

for i in range(pages):# 依次下载指定页数的图片
   page_num -= 1
   page_url = url + '/page-' + str(page_num) + '#comments'# 图片的URL
   # print(page_url)
   img_addrs = find_imgs(page_url)
   save_imgs(img_addrs)

if __name__ == '__main__':
download()

lslais2012 发表于 2017-9-14 15:50:33

现在网站的图片地址前面没有‘http:’，和以前不一样，所以不能保存，
比如<img src="//ws1.sinaimg.cn/mw600/005AlLw1gy1fjizb2zotvj30ij0rstay.jpg"

就在这个函数里面处理了一下：
def find_imgs(url): ###
html = url_open(url).decode('utf-8')
img_addrs = []#将图片地址保存到列表，开头没有http

a = html.find('img src=')

while a != -1:
   b = html.find('.jpg', a, a+255)
   if b != -1:
         img_addrs.append(html)###
   else:
         b = a + 9

   a = html.find('img src=', b)

img_new = ['http:'+ i for i in img_addrs] ##图片地址前加上‘http：’
img_addrs = img_new
returnimg_addrs

greenfansssss 发表于 2018-5-12 21:24:09

resp = urllib.request.urlopen(url),会报错：HTTP Error 403: Forbidden，resp = urllib.request.urlopen(req)可以正常运行，但是find_imgs获取不到链接，b一直为-1，列表一直为空。百思不得其解

greenfansssss 发表于 2018-5-12 21:30:07

@小甲鱼：resp = urllib.request.urlopen(url),会报错：HTTP Error 403: Forbidden，resp = urllib.request.urlopen(req)可以正常运行，但是find_imgs获取不到链接，b一直为-1，列表一直为空。百思不得其解

greenfansssss 发表于 2018-5-12 22:04:23

研究了下，是抓出来的网页，不能搜索到jpg，gif却可以，是因为网页做限制了吗？

greenfansssss 发表于 2018-5-12 22:27:22

这种方式可能是被反爬了

quruipeng 发表于 2018-6-19 10:41:55

小甲鱼已经成功引起了网站的注意。这个被反扒了，该怎么办？？？？

RyanPhang 发表于 2018-6-24 17:39:47

确实是被反爬了，好像用了动态网页。爬出来的只有这种东西。
http://jandan.net/ooxx/page-48#comments
//cdn.jandan.net/static/sos/panda2.jpg
http://jandan.net/ooxx/page-47#comments
//cdn.jandan.net/static/sos/panda2.jpg

罗同学 发表于 2018-7-1 20:50:02

RyanPhang 发表于 2018-6-24 17:39
确实是被反爬了，好像用了动态网页。爬出来的只有这种东西。
http://jandan.net/ooxx/page-48#comments
/ ...

坐等大神出现、我也是、照着一步步打，最后就下载出来一张熊猫。。。

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小甲鱼课程56，爬虫ooxx问题