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