import html_downloader
import html_parser
import 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.HtmlOuputer()
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.parser(new_url, html_cont)
self.urls.add_new_url(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 = 'https://baike.baidu.com/item/python'
obj_spider = SpiderMain()
obj_spider.craw(root_url)
import urllib.requestclass HtmlDownloader(object):
def downloadn(self, url):
if url is None:
return None
response = urllib.request.urlopen(url)
if response.getcode() != 200:
return None
return response.read()
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_url(self, url):
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
from bs4 import BeautifulSoup
import re
import urllib.parse
class HtmlParser(object):
def _get_new_urls(self, page_url, soup):
new_url = ser()
links = soup.find_all('a', href=re.compile(r'/item/'))
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
title_node = soup.find('dd', class_='lemmaWgt-lemmaTitle-title').find('h1')
res_data['title'] = title_node.get_text()
# lemma-summary
summary_node = soup.find('div", class_='lemma-summary')
res_data['summary'] = summary_node.get_text()
retrun res_data
def parser(self, page_url, html_cont):
if page_url is None or html_cont is None:
retrun
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)
retrun new_urls, new_data
class HtmlOutputer(object):
def __init__(self):
self.datas = []
def collect_data(self, data):
if data is None:
retrun
self.datas.append(data)
def output_html(self):
fout = open('output.html', 'w', encoding='utf-8')
fout.write('<html>')
fout.write('<head><meta http-equiv=\'content-type\' content=\'text/html;charset=utf-8\'></head>') 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['summary']) fout.write('</tr>') fout.write('</table>') fout.write('</body>') fout.write('</html>') fout.close()
添加回答
举报
0/150
提交
取消