spider_main：
import html_downloaderimport url_managerimport html_parserimport html_outputerimport tracebackclass 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: traceback.print_exc() print ('craw failed') self.outputer.output_html() if __name__=='__main__': root_url = "http://baike.baidu.com/view/21087.htm" obj_spider = SpiderMain() obj_spider.craw(root_url)html_downloader：
import 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()html_outputer：
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('') fout.write("") fout.write('') fout.write('') for data in self.datas: fout.write('') fout.write('%s'%data['url']) fout.write('%s'%data['title'].decode('utf-8').encode('utf-8')) fout.write('%s'%data['summary'].decode('utf-8').encode('utf-8')) fout.write('') fout.write('') fout.write('') fout.write('') fout.close()url_manager：
class 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_urlhtml_parser：
from bs4 import BeautifulSoupimport reimport urlparseclass HtmlParser(object): def _get_new_urls(self,page_url,soup): new_urls = set() #/view/123/htm links = soup.find_all('a',href=re.compile(r"/view/\d+\.htm")) 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_data(self,page_url,soup): res_data = {} #res_data['url'] = page_url # Python
title_node = soup.find('dd',class_="lemmaWgt-lemmaTitle-title").find("h1") res_data['title'] = title_node.get_text() #<div class="lemma-summary"> 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 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最后我用的python版本是2.7版本的 |
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