Python网页抓取、模拟登录

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