1. spider_main
# coding:utf8
from Spider_Test 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("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 == 7:
break
count = count + 1
except:
print("craw fail")
self.outputer.output_html()
if __name__ == "__main__":
root_url = "http://baike.baidu.com/view/114149.htm"
obj_spider = SpiderMain()
obj_spider.craw(root_url)
2. url_manager
# coding:utf8
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) # this place use the method
def add_new_urls(self, urls):
if urls is None or len(urls) == 0:
return
for url in urls:
self.add_new_url(url) # this place use the method
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
3. html_downloader
# coding:utf8
from urllib import request
class HtmlDownloader(object):
def download(self, url):
if url is None:
return None
# Python3.5 different from Python2.7
response = request.urlopen(url)
if response.getcode() != 200:
return None
return response.read().decode(‘utf-8‘,‘ignore‘)
4. html_parser
# coding:utf8
import re
import urllib
from bs4 import BeautifulSoup
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‘]
# different from Python2.7
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
# <dl class="lemmaWgt-lemmaTitle lemmaWgt-lemmaTitle-">
title_node = soup.find(‘dl‘,class_="lemmaWgt-lemmaTitle lemmaWgt-lemmaTitle-").find("h1")
res_data[‘title‘] = title_node.get_text() # the key should be right or it would raise an error
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
5. html_outputer
# coding:utf8
class HtmlOutPuter(object):
def __init__(self):
self.datas = []
def collect_data(self, data):
if data is None:
return
self.datas.append(data) # array use append method
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‘)不能编码成utf-8
# fout.write("<td>%s</td>" % data["summary"].encode(‘utf-8‘).decode(‘gbk‘,‘ignore‘))
fout.write("<td>")
fout.write(data["summary"].encode(‘utf-8‘).decode(‘gbk‘,‘ignore‘)) # this place can‘t display some characters
fout.write("</td>")
fout.write("</tr>")
fout.write("</table>")
fout.write("</body>")
fout.write("</html")
fout.close()
最终获取的html，有些字符不能显示，查资料，说是用命令cmd /K chcp 65001 但是用控制台查询codepage编码依然是，改动不了，说是windows 控制台的问题，先这样。
时间： 2024-12-15 07:35:52