一。安装软件（用eclispe 搭建好环境好，没有取省自动补全编写代码会很卡，最后选用sumblie）
eclispe 用的windows 32 4.31
python 用的 4.3.3 下载地址
pydev 用的2.4`
二。目录结构
三.各模块代码 ，调度器 spider_main.py, url管理器 url_manager.py, 网页下载器 html_downloader.py, 网页数据解析器 html_parser.py
采集数据输出 html_outputer.py
1.spider_main.py
import sys
import os
curPath = os.path.abspath(os.path.dirname(__file__))
rootPath = os.path.split(curPath)[0]
sys.path.append(rootPath)
from baike_spider import url_manager, html_downloader, html_parser,html_outputer
class SpiderMain(object):
def __init__(self):
# url 管理器， 模板下载器，下载数据解析器，解析数据输入器。 模块调度器
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 (count,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 == 10:
break
count = count + 1
except:
print (‘craw fail‘)
self.outputer.output_html()
if __name__ =="__main__":
root_url = "http://baike.baidu.com/view/21087.htm"
obj_spider = SpiderMain()
obj_spider.craw(root_url)
2.url_manager.py
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
3. html_downloader.py
import urllib.request
#print (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()
#obj = HtmlDownloader()
#obj.download("http://baike.bai du.com/view/21087.htm")
4.html_parser.py
from bs4 import BeautifulSoup
import re
#import urlparse
#import urllib.request
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‘]
# print(new_url)
new_full_url = "http://baike.baidu.com"+new_url
# print (new_full_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
ttile_node = soup.find(‘dd‘,class_="lemmaWgt-lemmaTitle-title").find("h1")
res_data[‘title‘] = ttile_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")
# print (soup)
new_urls = self._get_new_urls(page_url,soup)
# print (new_urls)
new_data = self._get_new_data(page_url,soup)
return new_urls, new_data
#test = HtmlParser()
#response = urllib.request.urlopen("http://baike.baidu.com/view/21087.htm")
#test.parse("http://baike.baidu.com/view/21087.htm",response.read())
5.html_outputer.py
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):
# print(self.datas)
fout = open(‘output.html‘,"w")
fout.write("<html>")
fout.write("<body>")
fout.write("<table>")
for data in self.datas:
# print(data[‘url‘])
# print(data[‘title‘])
# print(data[‘summary‘])
fout.write("<tr>")
fout.write("<td>%s</td>" % data[‘url‘].encode(‘utf-8‘).decode("utf-8"))
fout.write("<td>%s</td>" % data[‘title‘].encode(‘utf-8‘).decode("utf-8"))
# fout.write("<td>%s</td>" % data[‘summary‘].encode(‘utf-8‘).decode("utf-8"))
fout.write("</tr>")
fout.write("</table>")
fout.write("</body>")
fout.write("</html>")
submlie 中 Ctrl+B 运行。