# coding:utf8from baidu import url_manager,html_downloader,html_parser,html_outputerclass SpiderMain(object): def __int__(self): self.urls = url_mansger.UrlManager() self.downloader = htaml_downloader.HtmlDownloader() self.parser = html_parser.HtmlParser() self.outputer = htaml_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_url,new_data = self.parser.parser(new_url,html_cont) self.urls.add_new_url(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 = "http://http://baike.baidu.com/view/21087.htm" obj_spider = SpiderMain() obj_spider.craw(root_url)—————————分———————割———————线————————————# coding:utf8class UrlManager(object): def __int__(self): self.new_urls = set() self.old_urls = set() def add_new_url(self): 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): if urls is None or len(urls) == 0: return for url in urls: self.add_new_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—————————分———————割———————线————————————# coding:utf8class 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()—————————分———————割———————线————————————# coding:utf8class HtmlParser(object): def _get_new_urls(self,page_url,soup): new_urls = set() links = soup.find_all('a',href=re.compile(r"/view/\d+\.htaml")) for link in links new_url = link['href'] new_full_url = urlparse.urljoin(page_url,new_url) return new_urls def _get_new_data(self,page_url,soup): res_data = {} res_data['url'] = page_url #<dd class="lemmaWgt-lemmaTitle-title"><h1>Python</h1> title_node = soup.find('dd',class="lemmaWgt-lemmaTitle-title").find("h1") res_data['title'] = title_node.get_text() summary_node = soup.find('div',class_="lemma-summary") res_data['summary'] = summary_node.get_text() return res_data def parse(self,page_url,html_cont): if page_url is None or htaml_cont is None: return soup = BeatuifulSoup(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—————————分———————割———————线————————————# coding:utf8class HtmlOutputerr(object): def __int__(self): self.datas = [] def collect_data(self,data): if data is None: return self.datas.append(data) def output_html(self): fout = open('output.html','w') fout.write("<html>") fout.write("<body>") fout.write("<table>") for data in self.datas: fout.write("<tr>") fout.write("<tr>%s</td>" % data['data']) fout.write("<td>%s</td>" % data['title'].encode('utf=8')) fout.write("<td>%s</td>" % data['summary'].encode('utf=8')) fout.write("</tr>") fout.write("</table>") fout.write("</body>") fout.write("</table>")
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