主程序：
from baidubaike import url_manger, html_download, html_parser, html_outputer
class SpiderMain(object):
def __init__(self):
self.urls = url_manger.UrlManager()
self.downloader = html_download.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 +=1
except:
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)
parser程序：
from bs4 import BeautifulSoup
import re
from urllib.parse import urljoin
class HtmlParser(object):
def _get_new_urls(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" label-module="lemmaSummary">
summary_node = soup.find('div',class_="lemma-summary")
res_data['summary'] = summary_node.get_text()
return res_data
def _get_new_data(self, page_url, soup):
new_urls = set()
links = soup.find_all('a',re.compile(r'/view/\d+\.htm'))
for link in links:
new_url = link['href']
new_full_url = urljoin(page_url,new_url)
new_urls.add(new_full_url)
return new_urls
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
outputer程序：
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('')
for data in self.datas:
fout.write('')
fout.write('%s'% data['url'].encode('utf-8'))
fout.write('%s'% data['title'].encode('utf-8'))
fout.write('%s'% data['summary'].encode('utf-8'))
fout.write('')
fout.write('')
fout.write('') |
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