#coding:utf-8

import urllib2

import cookielib

url="http://www.baidu.com"

print '方法 1'

response1=urllib2.urlopen(url)

print response1.getcode()#验证打开网页是否成功，成功返回200

print len(response1.read())#打印读取网页长度

print'方法 2'

request=urllib2.Request(url)

request.add_header("user-agent","Mozilla/5.0")#伪装成浏览器

response2=urllib2.urlopen(request)

print response2.getcode()#验证打开网页是否成功，成功返回200

print len(response2.read())#打印读取网页长度

print '方法 3'

cj=cookielib.CookieJar()

opener=urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))

urllib2.install_opener(opener)

response3=urllib2.urlopen(url)

print response3.getcode()#验证打开网页是否成功，成功返回200

print cj

print len(response3.read())#打印读取网页长度