协程爬取doutula网站所有表情包

• readme.text

  • 运行环境：python3.x版本以上
  • 用到的库文件：requests库，re库，urllib库，queue库，gevent库，os库，lxml库
  • 终端执行命令：python3 doutula_spider.py 10  # 10表示爬区十页表情包

• soutula_spider.py

• import requests
  from lxml import etree
  import os
  import re
  from urllib import request
  from queue import Queue
  import gevent
  from gevent import monkey
  import sys
  
  
  monkey.patch_all()
  gQueue = Queue(20)
  gNext_queue = Queue(20)
  gQueue.put("http://www.doutula.com/photo/list/")
  gNext_queue.put("http://www.doutula.com/photo/list/")
  gCount = 0
  
  
  def parse_url():
      global gQueue
      global gNext_queue
      global gCount
      headers = {
          "User-Agent":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.109 Safari/537.36"
      }
      url = gQueue.get()  # 获取url地址
      response = requests.get(url, headers=headers)  # 获取响应
      html = etree.HTML(response.text)
      # 根据a标签来分组
      a_list = html.xpath("//div[@class='page-content text-center']//a[@class='col-xs-6 col-sm-3']")
      for li in a_list:
          img_url = li.xpath(".//@data-original")[0]  # 图片url
          title = li.xpath(".//@alt")[0]  # 标题
          title = re.sub(r"[?？! ！’“、]*?", "", title)  # 去除表情中不符合文件命名的符号
          suffix = os.path.splitext(img_url)[1]  # 判断该图片是gif还会jpg
          suffix = re.sub(r"!dta", "", suffix)  # 出去jpg!dta后坠名
          filename = title + suffix
          request.urlretrieve(img_url, "images/"+filename)  # 下载图片到images
      if re.findall("page=(\d+)", url):
          current_number = re.findall("page=(\d+)", url)[0]
          current_number = int(current_number)
      else:
          current_number = 1
      print("******第%d页已经下载完成******" % current_number)
      parse_url()
  
  
  def get_next_url(spider_number):
      """翻页"""
      global gQueue
      global gNext_queue
      global gCount
      headers = {
          "User-Agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.109 Safari/537.36"
      }
      start_url = gNext_queue.get()  # 获取url地址
      print(start_url)
      response = requests.get(start_url, headers=headers)  # 获取url响应
      html = etree.HTML(response.text)
      next_url = html.xpath("//a[@rel='next']/@href")[0]  # 获去next一页url地址
      next_url = "http://www.doutula.com" + next_url  # 补全url地址
      current_number = re.findall("page=(\d+)", next_url)[0]  # 获取当前url地址页数
      current_number = int(current_number)  # 转换成int
      gQueue.put(next_url)  # 添加到队列中
      gNext_queue.put(next_url)
      if current_number == spider_number:  # 判断是否终止需要下一页url
          print(next_url)
          return
      get_next_url(spider_number)
  
  
  def main():
      if len(sys.argv) != 2:  # 判断执行时候是否给脚本传递参数
          print("*"*30)
          print("请根据一下格式输入命令（需要给脚本传递参数）：")
          print("python3 doutula_spider.py 10  # 10表示爬去的页数是10页")
          print("*"*30)
          get_ansuer = input("请输入yes表示是否默认只下载第一第二页，其他键退出\n")
          if get_ansuer == 'yes':
              spider_number = 2
          else:
              return
      else:
          try:
              spider_number = int(sys.argv[1])  # 获取需要下载表情包的页数
          except Exception as e:
              print("请输入正确需要下载表情包的页数：%s" % e)
              return
      gevent.joinall([
          gevent.spawn(get_next_url, spider_number),  # 加载下一页url到gQueue， 只需一个
          gevent.spawn(parse_url),
          gevent.spawn(parse_url),  # 四个parse_url协程，速度更快
          gevent.spawn(parse_url),
          gevent.spawn(parse_url),
      ], timeout=30)
  
  
  if __name__ == '__main__':
      main()