前面简单提到了 Python 模拟登录的程序，但是没写清楚，这里再补上一个带注释的 Python 模拟登录的示例程序。简单说一下流程：先用cookielib获取cookie，再用获取到的cookie，进入需要登录的网站。
# -*- coding: utf-8 -*-
# !/usr/bin/python
import urllib2
import urllib
import cookielib
import re
auth_url = 'http://www.nowamagic.net/'
home_url = 'http://www.nowamagic.net/';
# 登陆用户名和密码
data={
"username":"nowamagic",
"password":"pass"
}
# urllib进行编码
post_data=urllib.urlencode(data)
# 发送头信息
headers ={
"Host":"www.nowamagic.net",
"Referer": "http://www.nowamagic.net"
}
# 初始化一个CookieJar来处理Cookie
cookieJar=cookielib.CookieJar()
# 实例化一个全局opener
opener=urllib2.build_opener(urllib2.HTTPCookieProcessor(cookieJar))
# 获取cookie
req=urllib2.Request(auth_url,post_data,headers)
result = opener.open(req)
# 访问主页 自动带着cookie信息
result = opener.open(home_url)
# 显示结果
print result.read()
再附带几个示例程序：
1. 使用已有的cookie访问网站
import cookielib, urllib2
ckjar = cookielib.MozillaCookieJar(os.path.join('C:\Documents and Settings\tom\Application Data\Mozilla\Firefox\Profiles\h5m61j1i.default', 'cookies.txt'))
req = urllib2.Request(url, postdata, header)
req.add_header('User-Agent', \
'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)')
opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(ckjar) )
f = opener.open(req)
htm = f.read()
f.close()
2. 访问网站获得cookie，并把获得的cookie保存在cookie文件中
import cookielib, urllib2
req = urllib2.Request(url, postdata, header)
req.add_header('User-Agent', \
'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)')
ckjar = cookielib.MozillaCookieJar(filename)
ckproc = urllib2.HTTPCookieProcessor(ckjar)
opener = urllib2.build_opener(ckproc)
f = opener.open(req)
htm = f.read()
f.close()
ckjar.save(ignore_discard=True, ignore_expires=True)
3. 使用指定的参数生成cookie,并用这个cookie访问网站
import cookielib, urllib2
cookiejar = cookielib.CookieJar()
urlOpener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cookiejar))
values = {'redirect':", 'email':'abc@abc.com',
'password':'password', 'rememberme':", 'submit':'OK, Let Me In!'}
data = urllib.urlencode(values)
request = urllib2.Request(url, data)
url = urlOpener.open(request)
print url.info()
page = url.read()
request = urllib2.Request(url)
url = urlOpener.open(request)
page = url.read()
print page
