python爬虫实现获取下一页代码-创新互联

我们首先来看下实例代码：

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from time import sleep

import faker
import requests
from lxml import etree

fake = faker.Faker()

base_url = "http://angelimg.spbeen.com"

def get_next_link(url):
  content = downloadHtml(url)
  html = etree.HTML(content)
  next_url = html.xpath("//a[@class='ch next']/@href")
  if next_url:
    return base_url + next_url[0]
  else:
    return False

def downloadHtml(ur):
  user_agent = fake.user_agent()
  headers = {'User-Agent': user_agent,"Referer":"http://angelimg.spbeen.com/"}
  response = requests.get(url, headers=headers)
  return response.text

def getImgUrl(content):
  html = etree.HTML(content)
  img_url = html.xpath('//*[@id="content"]/a/img/@src')
  title = html.xpath(".//div['@class=article']/h3/text()")

  return img_url[0],title[0]

def saveImg(title,img_url):
  if img_url is not None and title is not None:
    with open("txt/"+str(title)+".jpg",'wb') as f:
      user_agent = fake.user_agent()
      headers = {'User-Agent': user_agent,"Referer":"http://angelimg.spbeen.com/"}
      content = requests.get(img_url, headers=headers)
      #request_view(content)
      f.write(content.content)
      f.close()

def request_view(response):
  import webbrowser
  request_url = response.url
  base_url = '<head><base href="%s" rel="external nofollow" >' %(request_url)
  base_url = base_url.encode()
  content = response.content.replace(b"<head>",base_url)
  tem_html = open('tmp.html','wb')
  tem_html.write(content)
  tem_html.close()
  webbrowser.open_new_tab('tmp.html')

def crawl_img(url):
  content = downloadHtml(url)
  res = getImgUrl(content)
  title = res[1]
  img_url = res[0]
  saveImg(title,img_url)

if __name__ == "__main__":
  url = "http://angelimg.spbeen.com/ang/4968/1"

  while url:
    print(url)
    crawl_img(url)
    url = get_next_link(url)

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