package : baike_spider
spider_main.py
from baike_spider import url_manager, html_downloader, html_parser, html_outputer
import urllib.parse
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()
html_cont = self.downloader.download(new_url)
print("craw %d:%s" % (count,urllib.parse.unquote(new_url,encoding='utf-8')))
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("spider failed")
self.outputer.output_html() if name == "main":
root_url = "https://baike.baidu.com/item/Python/407313?fr=aladdin"
obj_spider = SpiderMain()
obj_spider.craw(root_url)
url_manager.py
coding:utf-8class 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_downloader.py
import urllib.request
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()html_parser.py
coding:utf-8from bs4 import BeautifulSoup
import re
import urllib.request
from urllib.parse import urljoin
class HtmlParser(object):
def _get_new_urls(self, page_url, soup):
new_urls = set()
links = soup.find_all('a', href=re.compile(r'/item/\w+'))
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 _get_new_data(self, page_url, soup):
res_data = {}
res_data['url'] = page_url
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_datahtml_outputer.py
coding:utf-8import urllib.parse
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', 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('<td>%s</td>' % (urllib.parse.unquote(data['url'],encoding='utf-8')))
fout.write('<td>%s</td>' % (urllib.parse.unquote(data['title'],encoding='utf-8')))
fout.write('<td>%s</td>' % (urllib.parse.unquote(data['summary'],encoding='utf-8')))
fout.write('</tr>')
fout.write('</table>')
fout.write('</body>')
fout.write('</html>')共同学习，写下你的评论
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