py

import httplib,urllib
import re
import random  

def Login(userid,password):
    params=urllib.urlencode({'id':userid,'pw':password});
    headers={'Referer':'http://bbs.nju.edu.cn/cache_bbsleft.htm'}
    #userdir是随机生成每个用户的线程，如‘/vd89905’
    userdir='/vd'+str(random.randint(100,100000))   

    conn=httplib.HTTPConnection('bbs.nju.edu.cn')
    conn.request('POST',userdir+'/bbslogin?type=2',params,headers)
    response=conn.getresponse()  

    msg=response.read()
    if response.status==200 and response.reason=='OK':
        print '>>>> login success!'  

    patt='\'(\d+)N'+userid+'\+(\d+)\''
    cookieOrign=re.findall(patt,msg)
    cookies=[]
    #小百合设置对_U_NUM+2，对_U_KEY-2
    cookies.append(str(int(cookieOrign[0][0])+2))
    cookies.append(str(int(cookieOrign[0][1])-2))
    cookie=' _U_NUM='+cookies[0]+'; _U_UID='\
             +userid+'; _U_KEY='+cookies[1]+' FOOTKEY=; '
    return cookie