import datetime
import time
from email.header import Header
import requests
import re
import smtplib
from email.mime.text import MIMEText
from bs4 import BeautifulSoup
def listener():
 #在這里我通過模擬登陸的方式登陸
 #一般來說這里填寫的是username跟password
 #但我們學校后臺將用戶名和密碼進行了加密
 #通過觀察瀏覽器的請求數(shù)據(jù)跟頁面源碼猜出學校后臺的加密方式
 data={
 #出于學校安全考慮，這里就不給出加密方式了
 'encoded':'xxxxxxxxxxxxxxxxxxx'
 }
 session = requests.Session()
 session.post('http://jwc.sgu.edu.cn/jsxsd/xk/LoginToXk',data=data)
 #請求2019-2020-1學期的所有成績
 r_data = {
 'kksj': '2019-2020-1',
 'kcxz': '',
 'kcmc': '',
 'xsfs': 'all'
 }
 r = session.post('http://jwc.sgu.edu.cn/jsxsd/kscj/cjcx_list', data=r_data)
 #對爬回來數(shù)據(jù)進行封裝
 soup = BeautifulSoup(r.text, 'html.parser')
 #返回已有的成績列表
 oldList = toList(soup)
 max = len(oldList)
 #這里用死循環(huán)定時爬取成績頁面分析是否分布新成績
 while (True):
 #post跟get方式不能亂用，不然數(shù)據(jù)會出錯
 r = session.post('http://jwc.sgu.edu.cn/jsxsd/kscj/cjcx_list',data=r_data)
 soup = BeautifulSoup(r.text, 'lxml')
 #print(soup.prettify())
 length = len(soup.find_all(string=re.compile('2019-2020-1')))-1
 print("course_length: ",length)
 if (r.status_code == 200 and length != 0):
  if (length > max):
  #查詢新出的成績列表
  newlist = toList(soup)
  #獲取兩個列表不同之處，不同的就是新成績
  diflist = compareTwoList(oldList, newlist)
  oldList=newlist
  if diflist=='':
   send("unkowned Error","unkowned Error")
  else:
   #有新成績了，發(fā)送郵件通知我
   send('you have new course sorce!!', diflist)
  max = length
  print('last running time was:',datetime.datetime.now())
  #定時作用，500s查一次
  time.sleep(500)
 else:
  # 發(fā)送郵件斷開連接了 print("had disconnected...")
  send("your server is disconnected!!!","your server is disconnected!!!")
  break
def send(title,msg):
 mail_host = 'smtp.qq.com'
 # 你的qq郵箱名，沒有.com
 mail_user = '你的qq郵箱名，沒有.com'
 # 密碼(部分郵箱為授權(quán)碼)
 mail_pass = '授權(quán)碼'
 # 郵件發(fā)送方郵箱地址
 sender = '發(fā)送方郵箱地址'
 # 郵件接受方郵箱地址，注意需要[]包裹，這意味著你可以寫多個郵件地址群發(fā)
 receivers = ['yoletpig@qq.com']
 # 設(shè)置email信息
 # 郵件內(nèi)容設(shè)置
 message = MIMEText(msg, 'plain', 'utf-8')
 # 郵件主題
 message['Subject'] = Header(title,'utf-8')
 # 發(fā)送方信息
 message['From'] = sender
 # 接受方信息
 message['To'] = receivers[0]
 # 登錄并發(fā)送郵件
 try:
 # smtpObj = smtplib.SMTP()
 # # 連接到服務(wù)器
 # smtpObj.connect(mail_host, 25)
 smtpObj = smtplib.SMTP_SSL(mail_host)
 # 登錄到服務(wù)器
 smtpObj.login(mail_user, mail_pass)
 # 發(fā)送
 smtpObj.sendmail(
  sender,receivers,message.as_string())
 # 退出
 smtpObj.quit()
 print('success')
 except smtplib.SMTPException as e:
 print('error', e) # 打印錯誤
def toList(soup):
 flag = True
 list = []
 strs = ''
 #對tr標簽下的td進行遍歷并取值
 for tr in soup.find_all('tr'):
 if flag:
  flag = False;
  continue
 i = 1
 for td in tr.stripped_strings:
  if (i == 1 or i == 2):
  i += 1
  continue
  strs += "_" + td
  i += 1
 list.append(strs)
 strs = ''
 return list
def compareTwoList(oldList,newList):
 diflist=''
 for sub in newList:
 #判斷是否唯一
 if(oldList.count(sub)==0):
  diflist = sub
  break
 return diflist
if __name__ == '__main__':
 listener()