通过使用scrapy爬取某学校全网

Posted 2021-01-09 longbigbeard

• 通过遍历全网url 实现爬取全网内容
• 忽略“.doc"等文件网页暂不处理，只爬取整个页面，不做清洗
•  spider.py

  # -*- coding: utf-8 -*-
  import scrapy
  from WSYU.items import WsyuItem
  import datetime
  from urllib import parse
  from scrapy.http import Request
  
  class WsyuSpider(scrapy.Spider):
      name = ‘wsyu‘
      allowed_domains = [‘wsyu.edu.cn‘]
      # start_urls = [‘http://www.wsyu.edu.cn/‘,]
      start_urls = [‘http://www.wsyu.edu.cn/‘,]
      html_url_set = []
      other_url_set =[]
      wenjian_end = ["@", ".pdf", ".jpg", ".gif", ".png", ".doc", ".xls", ".ppt", ".mp3", ".rar", ".zip",]
  
  
      def do_fiter(self,all_urls):
          for one_url in all_urls:
              if any(u in one_url for u in self.wenjian_end):
                  self.other_url_set.append(one_url)
              else:
                  pass
          return all_urls
  
  
  
      def parse(self, response):
          # 获取所有的地址链接
          all_urls = response.xpath(‘//a/@href‘).extract()
          all_urls = [parse.urljoin(response.url,url) for url in all_urls]
          all_urls1 = self.do_fiter(all_urls)
          # all_urls2 = list(filter(lambda x:True if x.startswith(‘‘http‘) else False, all_urls1))
          if all_urls1!=None:
              for one_url in all_urls1:
                  if one_url not in self.html_url_set and one_url not in self.other_url_set:
                      self.html_url_set.append(one_url)
                      # yield self.make_requests_from_url(one_url)
                      yield Request(parse.urljoin(response.url,one_url),callback=self.download_parse)
                      # 回调函数默认为parse
  
  
          else:
              yield Request(url=self.html_url_set[-2],callback=self.parse)
          
  
  
      def download_parse(self,response):
         
  
          item = WsyuItem()
          item[‘url‘] = response.url
          # print(item[‘url‘])
          item[‘content‘] = response.text
          # print(item[‘content‘])
          item[‘create_time‘] = datetime.datetime.now()
          # print(item[‘create_time‘])
          yield item
          # yield Request(url=response.url ,callback=self.parse)
          yield self.make_requests_from_url(response.url)

   

• 源代码放在github上了：https://github.com/longbigbeard/scrapy_demo/tree/master/WSYU
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