这个是main
#coding:utf8
from homework_test import url_manager, html_downloader, html_parser,\
html_outputer
class SpiderMain(object):
#构造函数,初始化各个对象
def __init__(self):
#url管理器
self.urls = url_manager.UrlManager()
#url下载器
self.downloader = html_downloader.HtmlDownloader()
#url解析器
self.parser = html_parser.HtmlParser()
#url输出器
self.outputer =html_outputer.HtmlOutputer()
#爬虫的调度程序
def craw(self, root_url):
#count记录当前爬取的是第几个url
count = 1
#1.首先将入口url添加入管理器
self.urls.add_new_url(root_url)
#启动爬虫循环,当管理器中有url时
while self.urls.has_new_url():
try:
#获取一个待爬取的url
new_url = self.urls.get_new_url()
print 'craw %d : %s' % (count,new_url)
#启动下载器下载页面
html_cont = self.downloader.download(new_url)
#调用解析器解析页面数据,返回新的url列表和新的数据
new_urls,new_data = self.parser.parse(new_url,html_cont)
#将新的url补充到管理器
self.urls.add_new_urls(new_urls)
#收集数据
self.outputer.collect_data(new_data)
#爬取3000个目标
if count == 100:
break
count = count + 1
except:
print 'craw failed'
#输出收集好的数据
self.outputer.output_html()
#1.首先编写main函数
if __name__=="__main__":
#2.编写入口的url
root_url = "http://www.bmw.com.cn/zh_CN/index.html"
obj_spider = SpiderMain()
#3.启动爬虫
obj_spider.craw(root_url)*********************************************************************这个是parser#coding:utf8from bs4 import BeautifulSoupimport reimport urlparseclass HtmlParser(object): def _get_new_urls(self, page_url, soup): #将结果存到一个列表中 new_urls = set() #/view/1234.htm #href="//www.bmw.com.cn/zh_CN/topics/premium_selection.html" #links = soup.find_all('a',href = re.compile(r"/view/\d+\.htm")) links = soup.find_all('a',href = re.compile(r"//www\.bmw\.com\.cn/zh_CN/topics/\w+\.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 ={} #url res_data['url']=page_url #<dd class="lemmaWgt-lemmaTitle-title"> <h1>Python</h1> #<li class="mainNavProductItemsSeries"> #ul class="mainNavItems" #<ul class="ul_level_2"> #title_node = soup.find('ul',class_="ul_level_2").find("li") #res_data['title'] = title_node.get_text() #<div class="lemma-summary" label-module="lemmaSummary"> #<div class="mainNavTopicItemsLevel2" #<div class="bottomNavBlock"> #<div class="overviewContainer"> summary_node = soup.find('div',class_="bottomNavBlock") 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='gb2312') new_urls = self._get_new_urls(page_url,soup) new_data = self._get_new_data(page_url,soup) return new_urls,new_data
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