python爬蟲爬取博客園

python 爬取 博客園 接 螞蟻學pythonP5生產者消費者爬蟲數據重覆問題

• 先看訪問地址
  

  • 訪問地址是https://www.cnblogs.com/#p2 但是實際訪問地址是https://www.cnblogs.com 說明其中存在貓膩；像這種我們給定指定頁碼，按理應該是 post 請求才對；於是乎 往下看了幾個連接
    

  • 然後再看一下payload 發現這個post 請求 才是我們想要的鏈接 其中PageIndex 就是我們要設置的頁數
    

• 代碼擼起來

  # Author: Lovyya
  # File : blog_spider
  import requests
  import json
  from bs4 import BeautifulSoup
  import re
  # 這個是為和老師的urls一致性 匹配urls裡面的數字
  rule = re.compile("\d+")
  
  urls = [f'https://www.cnblogs.com/#p{page}' for page in range(1, 31)]
  
  # pos請求網址
  url = "https://www.cnblogs.com/AggSite/AggSitePostList"
  headers = {
  	"content-type": "application/json",
  	"user-agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36 Edg/95.0.1020.30"
  }
  
  def craw(urls):
  	#idx 是'xxx.xxxx.xxx/#p{num}' 裡面的num 這樣寫可以不用改 後面生產者消費者的代碼 
  	idx = rule.findall(urls)[0]
  	# payload參數 只需要更改 idx 就行
  	payload = {
  		"CategoryType": "SiteHome", 
  		"ParentCategoryId": 0, 
  		"CategoryId": 808, 
  		"PageIndex": idx,
  		"TotalPostCount": 4000, 
  		"ItemListActionName": "AggSitePostList"
  	}
  	r = requests.post(url, data=json.dumps(payload), headers=headers)
  	return r.text
  
  def parse(html):
  	# post-item-title
  	soup = BeautifulSoup(html, "html.parser")
  	links = soup.find_all("a", class_="post-item-title")
  	return [(link["href"], link.get_text()) for link in links]
  
  if __name__ == '__main__':
  	for res in parse(craw(urls[2])):
  		print(res)