• 自学Python九 爬虫实战二(美图福利)


      作为一个新世纪有思想有文化有道德时刻准备着的屌丝男青年,在现在这样一个社会中,心疼我大慢播抵制大百度的前提下,没事儿上上网逛逛YY看看斗鱼翻翻美女图片那是必不可少的,可是美图虽多翻页费劲!今天我们就搞个爬虫把美图都给扒下来!本次实例有2个:煎蛋上的妹子图,某网站的rosi图。我只是一个学习python的菜鸟,技术不可耻,技术是无罪的!!!

      煎蛋:

      先说说程序的流程:获取煎蛋妹子图URL,得到网页代码,提取妹子图片地址,访问图片地址并将图片保存到本地。Ready? 先让我们看看煎蛋妹子网页:

      我们得到URL为:http://jandan.net/ooxx/page-1764#comments     1764就是页码, 首先我们要得到最新的页码,然后向前寻找,然后得到每页中图片的url。下面我们分析网站代码写出正则表达式!

      根据之前文章的方法我们写出如下函数getNewPage:

    1 def __getNewPage(self):
    2         pageCode = self.Get(self.__Url)
    3         type = sys.getfilesystemencoding()
    4         pattern = re.compile(r'<div .*?cp-pagenavi">.*?<span .*?current-comment-page">[(.*?)]</span>',re.S)
    5         newPage = re.search(pattern,pageCode.decode("UTF-8").encode(type))
    6         print pageCode.decode("UTF-8").encode(type)
    7         if newPage != None:
    8             return newPage.group(1)
    9         return 1500

      不要问我为什么如果失败返回1500。。。 因为煎蛋把1500页之前的图片都给吃了。 你也可以返回0。接下来是图片的

    1 def __getAllPicUrl(self,pageIndex):
    2         realurl = self.__Url + "page-" + str(pageIndex) + "#comments"
    3         pageCode = self.Get(realurl)
    4         type = sys.getfilesystemencoding()
    5         pattern = re.compile('<p>.*?<a .*?view_img_link">.*?</a>.*?<img src="(.*?)".*?</p>',re.S)
    6         items = re.findall(pattern,pageCode.decode("UTF-8").encode(type))
    7         for item in items:
    8             print item

      好了,得到了图片地址,接下来就是访问图片地址然后保存图片了:

    1     def __savePics(self,img_addr,folder):
    2         for item in img_addr:
    3             filename = item.split('/')[-1]
    4             print "正在保存图片:" + filename
    5             with open(filename,'wb') as file:
    6                 img = self.Get(item)
    7                 file.write(img)

      当你觉得信心满满的时候,一定会有一盆冷水浇到你的头上,毕竟程序就是这样,考验你的耐性,打磨你的自信。你测试了一会儿,然后你发现你重启程序后再也无法获取最新页码,你觉得我什么也没动啊为什么会这样。别着急,我们将得到的网页代码打印出来看看:

      看到了吧,是服务器感觉你不像浏览器访问的结果把你的ip给屏蔽了。    真是给跪了,辛辛苦苦码一年,屏蔽回到解放前!那么这个如何解决呢,答:换ip 找代理。接下来我们要改一下我们的HttpClient.py 将里面的opener设置下代理服务器。具体代理服务器请自行百度之,关键字:http代理 。 想找到一个合适的代理也不容易 自己ie Internet选项挨个试试,测试下网速。

     1 # -*- coding: utf-8 -*-
     2 import cookielib, urllib, urllib2, socket
     3 import zlib,StringIO
     4 class HttpClient:
     5   __cookie = cookielib.CookieJar()
     6   __proxy_handler = urllib2.ProxyHandler({"http" : '42.121.6.80:8080'})#设置代理服务器与端口
     7   __req = urllib2.build_opener(urllib2.HTTPCookieProcessor(__cookie),__proxy_handler)#生成opener
     8   __req.addheaders = [
     9     ('Accept', 'application/javascript, */*;q=0.8'),
    10     ('User-Agent', 'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)')
    11   ]
    12   urllib2.install_opener(__req)
    13 
    14   def Get(self, url, refer=None):
    15     try:
    16       req = urllib2.Request(url)
    17       #req.add_header('Accept-encoding', 'gzip')
    18       if not (refer is None):
    19         req.add_header('Referer', refer)
    20       response = urllib2.urlopen(req, timeout=120)
    21       html = response.read()
    22       #gzipped = response.headers.get('Content-Encoding')
    23       #if gzipped:
    24       #    html = zlib.decompress(html, 16+zlib.MAX_WBITS)
    25       return html
    26     except urllib2.HTTPError, e:
    27       return e.read()
    28     except socket.timeout, e:
    29       return ''
    30     except socket.error, e:
    31       return ''

      然后,就可以非常愉快的查看图片了。不过用了代理速度好慢。。。可以设置timeout稍微长一点儿,防止图片下载不下来!

      好了,rosi的下篇文章再放!现在是时候上一波代码了:

     1 # -*- coding: utf-8 -*-
     2 import cookielib, urllib, urllib2, socket
     3 import zlib,StringIO
     4 class HttpClient:
     5   __cookie = cookielib.CookieJar()
     6   __proxy_handler = urllib2.ProxyHandler({"http" : '42.121.6.80:8080'})
     7   __req = urllib2.build_opener(urllib2.HTTPCookieProcessor(__cookie),__proxy_handler)
     8   __req.addheaders = [
     9     ('Accept', 'application/javascript, */*;q=0.8'),
    10     ('User-Agent', 'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)')
    11   ]
    12   urllib2.install_opener(__req)
    13 
    14   def Get(self, url, refer=None):
    15     try:
    16       req = urllib2.Request(url)
    17       req.add_header('Accept-encoding', 'gzip')
    18       if not (refer is None):
    19         req.add_header('Referer', refer)
    20       response = urllib2.urlopen(req, timeout=120)
    21       html = response.read()
    22       gzipped = response.headers.get('Content-Encoding')
    23       if gzipped:
    24           html = zlib.decompress(html, 16+zlib.MAX_WBITS)
    25       return html
    26     except urllib2.HTTPError, e:
    27       return e.read()
    28     except socket.timeout, e:
    29       return ''
    30     except socket.error, e:
    31       return ''
    32 
    33   def Post(self, url, data, refer=None):
    34     try:
    35       #req = urllib2.Request(url, urllib.urlencode(data))
    36       req = urllib2.Request(url,data)
    37       if not (refer is None):
    38         req.add_header('Referer', refer)
    39       return urllib2.urlopen(req, timeout=120).read()
    40     except urllib2.HTTPError, e:
    41       return e.read()
    42     except socket.timeout, e:
    43       return ''
    44     except socket.error, e:
    45       return ''
    46 
    47   def Download(self, url, file):
    48     output = open(file, 'wb')
    49     output.write(urllib2.urlopen(url).read())
    50     output.close()
    51 
    52 #  def urlencode(self, data):
    53 #    return urllib.quote(data)
    54 
    55   def getCookie(self, key):
    56     for c in self.__cookie:
    57       if c.name == key:
    58         return c.value
    59     return ''
    60 
    61   def setCookie(self, key, val, domain):
    62     ck = cookielib.Cookie(version=0, name=key, value=val, port=None, port_specified=False, domain=domain, domain_specified=False, domain_initial_dot=False, path='/', path_specified=True, secure=False, expires=None, discard=True, comment=None, comment_url=None, rest={'HttpOnly': None}, rfc2109=False)
    63     self.__cookie.set_cookie(ck)
    64 #self.__cookie.clear() clean cookie
    65 # vim : tabstop=2 shiftwidth=2 softtabstop=2 expandtab
    HttpClient
     1 # -*- coding: utf-8 -*-
     2 from __future__ import unicode_literals
     3 from HttpClient import HttpClient
     4 import sys,re,os
     5 class JianDan(HttpClient):
     6     def __init__(self):
     7         self.__pageIndex = 1500 #之前的图片被煎蛋吞了
     8         self.__Url = "http://jandan.net/ooxx/"
     9         self.__floder = "jiandan"
    10     def __getAllPicUrl(self,pageIndex):
    11         realurl = self.__Url + "page-" + str(pageIndex) + "#comments"
    12         pageCode = self.Get(realurl)
    13         type = sys.getfilesystemencoding()
    14         pattern = re.compile('<p>.*?<a .*?view_img_link">.*?</a>.*?<img src="(.*?)".*?</p>',re.S)
    15         items = re.findall(pattern,pageCode.decode("UTF-8").encode(type))
    16         for item in items:
    17             print item
    18         self.__savePics(items,self.__floder)
    19 
    20     def __savePics(self,img_addr,folder):
    21         for item in img_addr:
    22             filename = item.split('/')[-1]
    23             print "正在保存图片:" + filename
    24             with open(filename,'wb') as file:
    25                 img = self.Get(item)
    26                 file.write(img)
    27 
    28     def __getNewPage(self):
    29         pageCode = self.Get(self.__Url)
    30         type = sys.getfilesystemencoding()
    31         pattern = re.compile(r'<div .*?cp-pagenavi">.*?<span .*?current-comment-page">[(.*?)]</span>',re.S)
    32         newPage = re.search(pattern,pageCode.decode("UTF-8").encode(type))
    33         print pageCode.decode("UTF-8").encode(type)
    34         if newPage != None:
    35             return newPage.group(1)
    36         return 1500
    37 
    38     def start(self):
    39         isExists=os.path.exists(self.__floder)#检测是否存在目录
    40         print isExists
    41         if not isExists:
    42             os.mkdir(self.__floder)
    43         os.chdir(self.__floder)
    44         page = int(self.__getNewPage())
    45         for i in range(self.__pageIndex,page):
    46             self.__getAllPicUrl(i)
    47 
    48 if __name__ == '__main__':
    49     jd = JianDan()
    50     jd.start()
    JianDan
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  • 原文地址:https://www.cnblogs.com/jixin/p/5142506.html
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