Python通過代理多線程抓取圖片

前言
Python作爲一門功能強大的腳本語言，經常被用來寫爬蟲程序，下面是Python通過代理多線程抓取圖片代碼

Python爬蟲多線程抓取代理服務器參考： http://www.linuxeye.com/program/1763.html
說明：

1. 多線程方式抓取代理服務器，並多線程驗證代理服務器

ps 代理服務器是從http://www.cnproxy.com/ （測試只選擇了8個頁面）抓取

1. 抓取一個網站的圖片地址，多線程隨機取一個代理服務器下載圖片

ps 圖片網站地址:http://www.ivsky.com（測試只選擇了有限的頁面數）

#!/usr/bin/env python
#BLOG:blog.linuxeye.com
#coding:utf-8

import urllib2
import re
import threading
import time
import random

rawProxyList = []
checkedProxyList = []
imgurl_list = []

#抓取代理網站
portdicts ={'v':"3",'m':"4",'a':"2",'l':"9",'q':"0",'b':"5",'i':"7",'w':"6",'r':"8",'c':"1"}
targets = []
for i in xrange(1,9):
        target = r"http://www.cnproxy.com/proxy%d.html" % i
        targets.append(target)
#print targets

#抓取代理服務器正則
p = re.compile(r'''<tr><td>(.+?)<SCRIPT type=text/javascript>document.write\(":"\+(.+?)\)</SCRIPT></td><td>(.+?)</td><td>.+?</td><td>(.+?)</td></tr>''')

#獲取代理的類
class ProxyGet(threading.Thread):
    def __init__(self,target):
        threading.Thread.__init__(self)
        self.target = target

    def getProxy(self):
        print "代理服務器目標網站： " + self.target
        req = urllib2.urlopen(self.target)
        result = req.read()
        #print chardet.detect(result)
        matchs = p.findall(result)
        for row in matchs:
            ip=row[0]
            port =row[1]
            port = map(lambda x:portdicts[x],port.split('+'))
            port = ''.join(port)
            agent = row[2]
            addr = row[3].decode("cp936").encode("utf-8")
            proxy = [ip,port,addr]
            #print proxy
            rawProxyList.append(proxy)

    def run(self):
        self.getProxy()

#檢驗代理的類
class ProxyCheck(threading.Thread):
    def __init__(self,proxyList):
        threading.Thread.__init__(self)
        self.proxyList = proxyList
        self.timeout = 5
        self.testUrl = "http://www.baidu.com/"
        self.testStr = "030173"

    def checkProxy(self):
        cookies = urllib2.HTTPCookieProcessor()
        for proxy in self.proxyList:
            proxyHandler = urllib2.ProxyHandler({"http" : r'http://%s:%s' %(proxy[0],proxy[1])})
            #print r'http://%s:%s' %(proxy[0],proxy[1])
            opener = urllib2.build_opener(cookies,proxyHandler)
            opener.addheaders = [('User-agent', 'Mozilla/5.0 (Windows NT 6.2; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0')] 
            #urllib2.install_opener(opener)
            t1 = time.time()

            try:
                #req = urllib2.urlopen("http://www.baidu.com", timeout=self.timeout)
                req = opener.open(self.testUrl, timeout=self.timeout)
                #print "urlopen is ok...."
                result = req.read()
                #print "read html...."
                timeused = time.time() - t1
                pos = result.find(self.testStr)
                #print "pos is %s" %pos

                if pos > 1:
                    checkedProxyList.append((proxy[0],proxy[1],proxy[2],timeused))
                    #print "ok ip: %s %s %s %s" %(proxy[0],proxy[1],proxy[2],timeused)
                else:
                     continue
            except Exception,e:
                #print e.message
                continue

    def run(self):
        self.checkProxy()

#獲取圖片地址函數
def imgurlList(url_home):
    global imgurl_list
    home_page = urllib2.urlopen(url_home)
    url_re = re.compile(r'<li><a href="(.+?)" target="_blank" rel="nofollow">')
    pic_re = re.compile(r'<img src="(.*?\.\w{3,4})"')
    url_list = re.findall(url_re,home_page.read())
    for url in url_list:
        #print url_home+url
        url_page = urllib2.urlopen(url_home+url)
        for imgurlList in re.findall(pic_re,url_page.read()):
            imgurl_list.append(imgurlList)

#下載圖片的類
class getPic(threading.Thread):
    def __init__(self,imgurl_list):
        threading.Thread.__init__(self)
        self.imgurl_list = imgurl_list 
        self.timeout = 5
    def downloadimg(self):
        for imgurl in self.imgurl_list:
            pic_suffix = imgurl.split('.')[-1] #獲取圖片後綴
            pic_name = str(random.randint(0,10000000000))+'.'+pic_suffix
            cookies = urllib2.HTTPCookieProcessor()
            randomCheckedProxy = random.choice(checkedProxyList) #隨機取一組代理服務器
            proxyHandler = urllib2.ProxyHandler({"http" : r'http://%s:%s' %(randomCheckedProxy[0],randomCheckedProxy[1])})
            opener = urllib2.build_opener(cookies,proxyHandler)
            opener.addheaders = [('User-agent', 'Mozilla/5.0 (Windows NT 6.2; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0')]
            urllib2.install_opener(opener)
            try:
                data_img = opener.open(imgurl,timeout=self.timeout)
                f = open (pic_name,'wb')
                f.write(data_img.read())
                f.close()
            except:
                continue
    def run(self):
        self.downloadimg()

if __name__ == "__main__":
    getThreads = []
    checkThreads = []
    imgurlList('http://www.ivsky.com')
    getPicThreads = []

#對每個目標網站開啓一個線程負責抓取代理
for i in range(len(targets)):
    t = ProxyGet(targets[i])
    getThreads.append(t)

for i in range(len(getThreads)):
    getThreads[i].start()

for i in range(len(getThreads)):
    getThreads[i].join()

print '.'*10+"總共抓取了%s個代理" %len(rawProxyList) +'.'*10

#開啓20個線程負責校驗，將抓取到的代理分成20份，每個線程校驗一份
for i in range(20):
    t = ProxyCheck(rawProxyList[((len(rawProxyList)+19)/20) * i:((len(rawProxyList)+19)/20) * (i+1)])
    checkThreads.append(t)

for i in range(len(checkThreads)):
    checkThreads[i].start()

for i in range(len(checkThreads)):
    checkThreads[i].join()

print '.'*10+"總共有%s個代理通過校驗" %len(checkedProxyList) +'.'*10

#開啓20個線程隨機取一個代理下載圖片
for i in range(20):
    t = getPic(imgurl_list[((len(imgurl_list)+19)/20) * i:((len(imgurl_list)+19)/20) * (i+1)])
    getPicThreads.append(t)

for i in range(len(getPicThreads)):
    getPicThreads[i].start()

for i in range(len(getPicThreads)):
    getPicThreads[i].join()

print '.'*10+"總共有%s個圖片下載" %len(imgurl_list) +'.'*10

#代理排序持久化
f= open("proxy_list.txt",'w+')
for proxy in sorted(checkedProxyList,cmp=lambda x,y:cmp(x[3],y[3])):
    #print "checked proxy is: %s:%s\t%s\t%s" %(proxy[0],proxy[1],proxy[2],proxy[3])
    f.write("%s:%s\t%s\t%s\n"%(proxy[0],proxy[1],proxy[2],proxy[3]))
f.close()

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測試結果：

# ls
proxy_getpic.py
# python proxy_getpic.py
代理服務器目標網站： http://www.cnproxy.com/proxy1.html
代理服務器目標網站： http://www.cnproxy.com/proxy2.html
代理服務器目標網站： http://www.cnproxy.com/proxy3.html
代理服務器目標網站： http://www.cnproxy.com/proxy4.html
代理服務器目標網站： http://www.cnproxy.com/proxy5.html
代理服務器目標網站： http://www.cnproxy.com/proxy6.html
代理服務器目標網站： http://www.cnproxy.com/proxy7.html
代理服務器目標網站： http://www.cnproxy.com/proxy8.html
..........總共抓取了800個代理..........
..........總共有458個代理通過校驗..........
..........總共有154個圖片下載..........
# cat proxy_list.txt | more
173.213.113.111:3128    United States   0.432188987732
173.213.113.111:8089    United States   0.441318035126
173.213.113.111:7808    United States   0.444597005844
110.4.24.170:80 香港 香港移動通訊有限公司       0.489440202713
211.142.236.135:8080    湖南省株洲市 移動       0.490673780441
211.142.236.135:8081    湖南省株洲市 移動       0.518096923828
211.142.236.135:8000    湖南省株洲市 移動       0.51860499382
211.142.236.135:8082    湖南省株洲市 移動       0.520448207855
# ls
1001117689.jpg  3097883176.jpg  5234319709.jpg  7012274766.jpg  8504924248.jpg
1076458640.jpg  3144369522.jpg  5387877704.jpg  7106183143.jpg  867723868.jpg
1198548712.jpg  3161307031.jpg  5572092752.jpg  7361254661.jpg  8746315373.jpg
165738192.jpg   3228008315.jpg  5575388077.jpg  7389537793.jpg  8848973192.jpg
1704512138.jpg  3306931164.jpg  5610740708.jpg  7407358698.jpg  8973834958.jpg
1742167711.jpg  3320152673.jpg  5717429022.jpg  7561176207.jpg  8976862152.jpg