Python网页抓取、模拟登录

From: http://www.cnblogs.com/bboy/archive/2010/10/29/1864537.html

用python抓取网页是非常简单的事，简单的几行代码就可以解决。。。这里稍微记录一下

 

需要引用的包有主要是 urllib2，urllib也可以引入，具体 看代码

 

#-------------------------------------------------------------------------------

# Name:        模拟登录web

# Purpose:

#

# Author:      huwei

#

# Created:     26/10/2010

# Copyright:   (c) huwei 2010

# Licence:     <your licence>

#-------------------------------------------------------------------------------

#!/usr/bin/env python

import time,urllib2,urllib

def main():

    

    #登录博客园
    loginCNblogs()

    pass

#登录博客园
def loginCNblogs():

    try:

        #设置 cookie
        cookies = urllib2.HTTPCookieProcessor()

        opener = urllib2.build_opener(cookies)

        urllib2.install_opener(opener)

        parms = {"tbUserName":"用户名","tbPassword":"密码","__EVENTTARGET":"btnLogin","__EVENTARGUMENT":"",

        "__VIEWSTATE":"/wEPDwULLTExMDE0MzIzNDRkGAEFHl9fQ29udHJvbHNSZXF1aXJlUG9zdEJhY2tLZXlfXxYBBQtjaGtSZW1lbWJlcmcJekJlt5rFwfnjeMMnX9V58Xhg",

        "__EVENTVALIDATION":"/wEWBQKit6iCDALyj/OQAgK3jsrkBALR55GJDgKC3IeGDK6TQlRlirS2Zja1Lmeh02u4XMwV",

        "txtReturnUrl":"http://bboy.cnblogs.com"}

        loginUrl = "http://passport.cnblogs.com/login.aspx"

        login = urllib2.urlopen(loginUrl,urllib.urlencode(parms))

        

        

        #print(unicode(login.read(),"utf8"))

        #显示配置页面
        avatar = urllib2.urlopen("http://home.cnblogs.com/set/avatar/")

        #print(avatar.read().decode("utf8"))
    except Exception,e:

        print(e)

    pass

if __name__ == '__main__':

    main()

 

 

获取 网页很简单 直接 urllib2.urlopen(url).read() 就可以得到网页源码

这里是抓取登录后的页面，所有开头需要设置cookie

cookies = urllib2.HTTPCookieProcessor()

opener = urllib2.build_opener(cookies)

urllib2.install_opener(opener)

 

设置完 cookie以后 再使用 urllib2.urlopen()方法就可以带上你登录成功的cookie了