python爬虫抓去google图片搜索结果的图片

# -*- coding: gbk -*-

import mechanize

from BeautifulSoup import BeautifulSoup

import cookielib,re

import base64,zlib

import Image,StringIO

# Browser

br = mechanize.Browser()

# Cookie Jar

cj = cookielib.LWPCookieJar()

br.set_cookiejar(cj)

# Browser options

br.set_handle_equiv(True)

br.set_handle_gzip(True)

br.set_handle_redirect(True)

br.set_handle_referer(True)

br.set_handle_robots(False)

br.set_handle_refresh(mechanize._http.HTTPRefreshProcessor(), max_time=1)

br.addheaders = [('User-agent', 'Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.1) Gecko/2008071615 Fedora/3.0.1-1.fc9 Firefox/4.0.0')]

br.open("http://www.google.com.hk/search?um=1&newwindow=1&safe=strict&hl=zh-CN&biw=1920&bih=473&tbm=isch&sa=1&q=car&btnG=")

html = br.response().read()

content = BeautifulSoup(html).findAll('script')

pattern = re.compile(r"(?<=data:image/jpeg;base64,).*(?=';)")

count=0

for item in content:

#print item

match = pattern.search(str(item))

if match:

dataStr = match.group()

dataStr = dataStr.replace(r'\x3d','=') #这行代码是关键，折腾了我大半天。网页里的base64编码，在不是4的倍数时，会用“\x3d”补足，要替换为=；（0x3d即为=的Ascii码值）

bin = StringIO.StringIO(dataStr)

bout=open('d:\\out\\data%d.jpeg'%count,'wb')

base64.decode(bin,bout)

bout.close()

count +=1

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