def __init__(self, beginurl, reg, priorcontent, pages, downloadFolder):
self.reg = reg
self.beginurl = beginurl
self.pages = pages
self.downFolder = downloadFolder
self.priorcontent = priorcontent
if not os.path.isdir( downloadFolder ):
os.mkdir( downloadFolder )
self.priQueue = PriorityQueue()
self.downlist = PriorityQueue()
class Spider(object):
musthave = ''
beginurl = ''
pages = ''
downFolder = ''
priQueue = PriorityQueue()
downlist = PriorityQueue()
def __init__(self, beginurl, reg, priorcontent, pages, downloadFolder):
self.reg = reg
self.beginurl = beginurl
self.pages = pages
self.downFolder = downloadFolder
self.priorcontent = priorcontent
if not os.path.isdir( downloadFolder ):
os.mkdir( downloadFolder )
self.priQueue = PriorityQueue()
self.downlist = PriorityQueue()
def md5(self, content):
m=hashlib.md5()
m.update(content)
return m.hexdigest()
def updatePriQueue(self, priQueue, url ):
"input new web page to be crawled into priQueue"
extraPrior = url.endswith('.html') and 2 or 0 #url with 'html' has higher priority
extraURL = self.priorcontent in url and 5 or 0 #
item = priQueue.getitem(url)
if item :
newitem = ( item[0]+1+extraPrior+extraURL, item[1] )
priQueue.remove(item)
priQueue.push( newitem )
else :
priQueue.push( (1+extraPrior+extraURL,url) )
def getMainUrl(self, url):
"obtain the host address for URL"
ix = url.find('/',len('http://') )
if ix > 0 :
return url[:ix]
else :
return url
def analyseHtml(self, url, html):
"analyze the html to find new URL to be crawled"
p = Parser()
try :
p.feed(html)
p.close()
except:
print ""
mainurl = self.getMainUrl(url)
for k, v in p.anchors.items():
for u in v :
if (not u.startswith('http://')) : #handle the relative URL, transfer href ='test/1.html' to href='http://xxx/test/1.html'
u = mainurl + u
if not self.downlist.count(u) and re.match(self.reg, u) : #if url is not downloaded and match the required regular expression
print 'add new url: ' + u
self.updatePriQueue( self.priQueue, u )
def downloadUrl(self, id, url):
"download the web page related to the specified URL and analyze the web page"
headers = {
'User-Agent':'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6'
}
postdata=urllib.urlencode({
'emailAddress':'*****@*****.**',
'password':'******',
'signIn':'1'
})
req = urllib2.Request(
url = url,
headers = headers,
data = postdata
)
downFileName = self.downFolder+'/%d.html' %(id)
print 'crawling: ', url,
try:
fp = urllib2.urlopen(req)
except:
print '[ failed ]'
return False
else :
print '[ success ]'
self.downlist.push( url ) #add the downloaded url into downlist
html = fp.read()
self.saveHTML(url,html,downFileName)
fp.close()
print 'analyzing: ', url
self.analyseHtml(url,html)
return True
def saveHTML(self,url,html,path=''):
if path != '':
print 'downloading',url,'as', path ,
op = open(path,"wb")
op.write( html )
op.close()
def usage(self):
print >> sys.stderr,'this is a test for function'
def run(self):
"spider running function, fetch the url from priority queue and crawl the web page, and then add new url into priority queque"
self.priQueue.push( (1,self.beginurl) )
i = 0
fp = open('url.txt','w')
while not self.priQueue.empty() and i < self.pages :
k, url = self.priQueue.pop()
if self.downloadUrl(i+1, url):
i += 1
fp.write(url+' '+self.md5(url)+'\n')
fp.flush()
fp.close()
print '\nDownload',i,'pages, Totally.'
