Python爬虫学习（简单的模拟登陆（二））

#-*-coding:utf8-*-

import smtplib
from email.mime.text import MIMEText
import requests
from lxml import etree
import os
import time
import sys
reload(sys)
sys.setdefaultencoding('utf-8')

#########################################################################################
class mailhelper(object):
def __init__(self):

self.mail_host="smtp.xxxx.com"  #设置服务器
self.mail_user="xxxxxx"    #用户名
self.mail_pass="xxxxxx"   #密码
self.mail_postfix="xxxx.com"  #发件箱的后缀

def send_mail(self,to_list,sub,content):
me="xxoohelper"+"<"+self.mail_user+"@"+self.mail_postfix+">"
msg = MIMEText(content,_subtype='plain',_charset='utf-8')
msg['Subject'] = sub
msg['From'] = me
msg['To'] = ";".join(to_list)
try:
server = smtplib.SMTP()
server.connect(self.mail_host)
server.login(self.mail_user,self.mail_pass)
server.sendmail(me, to_list, msg.as_string())
server.close()
return True
except Exception, e:
print str(e)
return False
############################################################################################################3

class xxoohelper(object):
def __init__(self):
self.url = 'http://weibo.cn/xxxxxx' #请输入准备抓取的微博地址

def getSource(self):
html = requests.get(self.url).content
return html

def getData(self,html):
data = {"Cookie":"需要抓取的Cookies"}
return data

def getContent(self,data):
newhtml = requests.get(self.url,cookies = data).content
new_selector = etree.HTML(newhtml)
content = new_selector.xpath('//span[@class="ctt"]')
newcontent = unicode(content[2].xpath('string(.)')).replace('http://','')
sendtime = new_selector.xpath('//span[@class="ct"]/text()')[0]
sendtext = newcontent + sendtime
return sendtext

def tosave(self,text):
f= open('weibo.txt','a')
f.write(text + '\n')
f.close()

def tocheck(self,data):
if not os.path.exists('weibo.txt'):
return True
else:
f = open('weibo.txt', 'r')
existweibo = f.readlines()
if data + '\n' in existweibo:
return False
else:
return True

if __name__ == '__main__':
mailto_list=['xxxxxx@qq.com'] #此处填写接收邮件的邮箱
helper = xxoohelper()
while True:
source = helper.getSource()
data = helper.getData(source)
content = helper.getContent(data)
if helper.tocheck(content):
if mailhelper().send_mail(mailto_list,u"女神更新啦",content):
print u"发送成功"
else:
print u"发送失败"
helper.tosave(content)
print content
else:
print u'pass'
time.sleep(10)