爬取主页http://baike.baidu.com/view/21087.htm 输出网页为空白

wzb1036868024 2016-09-24 09:00:38

第一部分：

from baike_spider import url_manager, html_downloader, html_parser,html_outputer

class 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 ('crawl %d: %s' % (count,new_url))
print('0')
html_cont = self.downloader.download(new_url)
print('1')
new_urls,new_data=self.parser.parse(new_url,html_cont)
print('2')
self.urls.add_new_urls(new_urls)
print('3')
self.outputer.collect_data(new_data)
print('4')

if count==100:
break

count=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)

第二部分：
import urllib

class HtmlDownloader(object):

def download(self,url):

if url is None:
return None
response = urllib.request.urlopen(url)

if response.getcode()!=200:
return None
return response.read()

第三部分：

from bs4 import BeautifulSoup
import re
import urllib

class HtmlParser(object):

def _get_new_urls(self, page_url, soup):
new_urls= set()

links = soup.find_all('a',href =re.compile(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={}

res_data['url']=page_url

#<dd class="lemmaWgt-lemmaTitle-title"><h1></h1></dd
title_node=soup.find('dd',class_="lemmaWgt-lemmaTitle-title").find("h1")
res_data['title']=title_node.get_text()

#<div class="lemma-summary" ><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_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

第四部分：

class HtmlOutputer(object):
def __init__(self):
self.datas =[ ]

def collect_data(self,data):
if data is None:
return None
print (data['url'])
print (data['title'].encode('utf-8'))
print (data['summary'].encode('utf-8'))
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("<td>%s</td>"% data['url'])
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("</html>")
fout.close()

第五部分：

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_url

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