def add_index(self,domain,soup):
url_encrypt = md5(domain)
if UrlInfo.isIndexed(url_encrypt):return
# 插入url
#if not UrlInfo.isIndexed(url_encrypt):
urlinfo = UrlInfo.objects.create(url=domain,url_encrypt=url_encrypt,createtime=time.time())
#else:
#urlinfo = UrlInfo.objects.get(url_encrypt=url_encrypt)
#start_index = 0
# 提取title
if soup.html.head.title:
text_title = soup.html.head.title.get_text().strip()
text_title_list = self.separatewords(text_title)
self.add_location(urlinfo,text_title_list,1)
# 获取关键字
if soup.html.head.keywords:
text_keywords = soup.html.head.keywords.get_text().strip()
text_keywords_list = self.separatewords(text_keywords)
self.add_location(urlinfo,text_keywords_list,2)
# 获取描述
if soup.html.head.description:
text_description = soup.html.head.description.get_text().strip()
text_description_list = self.separatewords(text_description)
self.add_location(urlinfo,text_description_list,3)
# 获取内容
text_content = self.get_content(soup.html.body,0)
text_content_list = self.separatewords(text_content)
self.add_location(urlinfo,text_content_list,4)
def add_link(self,from_url,to_url,link_text):
try:
url_from = UrlInfo.objects.get(url_encrypt=md5(from_url))
url_to = UrlInfo.objects.get(url_encrypt=md5(to_url))
except:
return
if url_from == url_to or LinkInfo.isExist(url_from,url_to) : return
linkinfo = LinkInfo.objects.create(from_url=url_from,to_url=url_to,createtime=time.time())
if link_text:
words = self.separatewords(link_text)
if not words:
return
for word in words:
wordinfo = self.get_word(word)
if not wordinfo:continue
LinkWords.objects.create(link=linkinfo,word=wordinfo)
def main(self,urllist,dep=0):
for domain in urllist:
#爬行
try:
c = urllib2.urlopen(domain)
except:
continue
#是否发生重定向
redirected = c.geturl() != domain
if redirected:
continue
soup = BeautifulSoup(c.read(),"html.parser")
self.add_index(domain,soup)
# 查找其他链接
links = soup.find_all("a")
filter_links = ["","javascript:;","#","javascript:void(0);"]
if links:
newpages = []
for link in links:
if 'href' in dict(link.attrs) and link["href"] not in filter_links:
url = urljoin(domain,link["href"])
if url.find("'") != -1:continue
url = url.split("#")[0]
if url[0:4] == "http" and url != domain :
if not UrlInfo.isIndexed(md5(url)):
newpages.append(url)
link_text = self.get_content(link,0)
# 添加到链接来源
self.add_link(domain,url,link_text)
#递归获取，不大于3级目录
if newpages and dep < 3:
self.main(newpages, dep+1)
else:
continue
else:
continue
return True
