使用的是python2.7#主函数spider_main.py# coding :utf8from baike_spider import url_manager,html_downloader,html_outputer,\ html_parserclass SpiderMain(object): def __init__(self): self.urls = url_manager.UrlManager() self.downloader = html_downloader.HtmlDownloader() self.parser = html_parser.HtmlParser() self.outputer = html_outputer.HtmlOutputer() def craw(self,root_url): count = 1 self.urls.add_new_url(root_url) while self.urls.has_new_url(): try: new_url = self.urls.get_new_url() print 'craw %d : %s ' % (count, new_url) html_cont = self.downloader.download(new_url) new_urls, new_data = self.parser.parse(new_url, html_cont) self.urls.add_new_urls(new_urls) self.outputer.collect_data(new_data) if count == 1000: break count = count +1 except: print 'craw failed' self.outputer.output_html()if __name__ == "__main__": root_url = "https://baike.baidu.com/item/Python/407313?fr=aladdin" obj_spider = SpiderMain( ) obj_spider.craw(root_url)#url_manager.py# coding : utf8class UrlManager (object): def __init__(self): self.new_urls = set() self.old_urls = set() def add_new_url(self,url): if url is None: return if url not in self.new_urls and url not in self.old_urls: self.new_urls.add(url) def add_new_urls(self,urls): if urls is None or len (urls) == 0: return for url in urls: self.add_new_url(url) def has_new_url(self): return len(self.new_urls) !=0 def get_new_url(self): new_url = self.new_urls.pop() self.old_urls.add(new_url) return new_url# html_parser.py# coding : utf8import reimport urlparsefrom bs4 import BeautifulSoupclass HtmlParser (object): def _get_new_urls(self,page_url,soup): new_urls = set () #/item/Python/407313?fr=aladdin links = soup.find_all('a',href=re.compile(r"/item/Python/\d+\?fr=aladdin")) for link in links: new_url = link['href'] new_full_url = urlparse.urljoin(page_url,new_url) new_urls.add(new_full_url) return new_urls def _get_new_date(self,page_url,soup): res_date={} # url res_date['url'] =page_url #Python
title_node = soup.find('dd',class_="lemmaWgt-lemmaTitle-title").find("h1") res_date['title'] = title_node.get_text() #<div class="lemma-summary" label-module="lemmaSummary"> summary_node = soup.find('div',class_="lemma-summary") res_date['summary'] = summary_node.get_text() return res_date def parse(self,page_url,html_cont): if page_url is None or html_cont is None: return soup = BeautifulSoup(html_cont,'html.parser',from_encoding='utf-8') new_urls = self._get_new_urls(page_url,soup) new_data = self._get_new_data(page_url,soup) return new_urls,new_data#html_outputer.py# coding : utf8import reimport urlparsefrom bs4 import BeautifulSoupclass HtmlParser (object): def _get_new_urls(self,page_url,soup): new_urls = set () #/item/Python/407313?fr=aladdin links = soup.find_all('a',href=re.compile(r"/item/Python/\d+\?fr=aladdin")) for link in links: new_url = link['href'] new_full_url = urlparse.urljoin(page_url,new_url) new_urls.add(new_full_url) return new_urls def _get_new_date(self,page_url,soup): res_date={} # url res_date['url'] =page_url #Python
title_node = soup.find('dd',class_="lemmaWgt-lemmaTitle-title").find("h1") res_date['title'] = title_node.get_text() #<div class="lemma-summary" label-module="lemmaSummary"> summary_node = soup.find('div',class_="lemma-summary") res_date['summary'] = summary_node.get_text() return res_date def parse(self,page_url,html_cont): if page_url is None or html_cont is None: return soup = BeautifulSoup(html_cont,'html.parser',from_encoding='utf-8') new_urls = self._get_new_urls(page_url,soup) new_data = self._get_new_data(page_url,soup) return new_urls,new_data#html_downloader.py# coding : utf8import urllib2class HtmlDownloader (object): def download(self,url): if url is None : return None response=urllib2.urlopen(url) if response.getcode() != 200: return None return response.read() |
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