class spidermain(object):??? def __init__(self):??????? self.urls=manager()??????? self.downloader=htmldownloader()??????? self.parser=htmlparser()??????? self.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()??????????????? html_cont=self.downloader.htmldownloader(new_url)??????????????? print ('carw %d : %s'%(count,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='http://baike.baidu.com/link?url=HiLgunmevYfwmNeyDfoDsrKn4d2OSBg-wcbpXCMCLKo53TPcrL8mGOW-xBdn5Q_gOaMVAQFmXIqkpKNAjQyR2a'??????????? obj_spider=spidermain()??????????? obj_spider.craw(root_url)#html管理器? html_manager模塊class manager(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??????? if 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下載器? htmldownloader模塊import urllib.requestimport urllib.errorclass htmldownloader(object):??? def download(self,url):??????? if url is None:??????????? return None??????? response=urllib.request.ulropen(url)??????? if response.getcode()!=200:??????????? return None??????? return response.read()?????? ?#html解析器? htmlparser模塊from bs4 import BeautifulSoupimport re import urllib.parseclass htmlparser(object):?? ???? def _get_new_urls(self,page_url,soup):??????? new_urls=set()??????? #<a target="_blank" href="/view/592974.htm">解釋器</a>??????? links=soup.find_all('a',href=re.complie(r'/view/\d+\.htm'))??????? for link in links:??????????? new_url=link['href']??????????? new_full_url=urllib.parse.urljoin(page_url,new_url)??????????? new_urls.add(new_full_url)??????? return new_urls?? ???? def _get_new_data(self,page_url,soup):??????? res_data={}??????? #url??????? 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()?????? ???????? #<div class="lemma-summary" label-module="lemmaSummary"></div>? ???????? summary_node=soup.find('div',class_='lemma-summary')??????? res_data['summary']=summary_node.get_text()??????? return res_data?????? ???? def parse(self,page_url,html_count):??????? if page_url is None or html_count is None:??????????? return??????? soup=BeautifulSoup(html_count,'html.parser',form_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輸出器 htmloutputer模塊class htmloutputer(object):??? def __init__(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>')?????? ???????? #ascii??????? for data in self.datas:??????????? fout.write('<tr>')??????????? fout.write('<td>%s</td>'%data['url'])??????????? fout.write('<td>%s</td>'%data['title'],edcoding='utf-8')??????????? fout.write('<td>%s</td>'%data['summary'],edcoding='utf-8')??????????? fout.write('<tr>')?????? ???????? fout.write('</table>')??????? fout.write('</body>')??????? fout.write('</html>')?????? ???????? fout.close()
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