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静态页面的抓取（学习简单爬虫）

2015-12-25 18:36 337 查看

圣诞节快乐(づ￣ 3￣)づ～～～

在这个半放假的日子里，人也变得慵懒起来，在MOOC下学习了静态页面的简单爬虫（传送门：http://www.imooc.com/learn/563），干货满满啊～～

所以爬了一个芈月传么么哒～～～

# coding=utf-8
import urllib2
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

class 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()

from bs4 import BeautifulSoup
import re
import urlparse

class 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
#<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 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

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("<meta charset='UTF-8'>")
fout.write("<body>")
fout.write("<table>")
for data in self.datas:
fout.write("<tr>")
#asci
fout.write("<td>%s</td>"% data['url'])
fout.write("<td>%s</td>"% data['title'].encode('utf-8'))
print data['title'].encode('utf-8')
fout.write("<td>%s</td>"% data['summary'].encode('utf-8'))
fout.write("</table>")
fout.write("</body>")
fout.write("</html>")
fout.close()
class SpiderMain(object):
def __init__(self):
self.urls = UrlManager()
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()
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==50:
break
count = count +1
except:
print 'craw failed'
self.outputer.output_html()
if __name__=="__main__":
root_url="http://baike.baidu.com/subview/9975572/10764629.htm"
obj_spider= SpiderMain()
obj_spider.craw(root_url)

有些小的细节没有做好，所以在调试上费了不少的功夫，还是太粗心了T^T

需要说明的一点是，跟着老师的代码，当写入到output.html中出现了乱码，但是写到output.txt中不会有问题。查了一下是因为html页面如果是中文也需要进行编码的说明，因此在原来代码基础上增加了

fout.write("<meta charset='UTF-8'>")

开心地去看芈月传啦～～～～

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