Python使用代理抓取网站图片（多线程）

程序员文章站 2022-05-15 09:09:11

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一、功能说明：
1. 多线程方式抓取代理服务器，并多线程验证代理服务器
ps 代理服务器是从http://www.cnproxy.com/ （测试只选择了8个页面）抓取
2. 抓取一个网站的图片地址，多线程随机取一个代理服务器下载图片
二、实现代码

复制代码代码如下:

#!/usr/bin/env python
#coding:utf-8

import urllib2
import re
import threading
import time
import random

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

#抓取代理网站
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

#抓取代理服务器正则
p = re.compile(r'''

(.+?) (.+?) .+? (.+?) ''')

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

def getProxy(self):
print "代理服务器目标网站： " + 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()

#检验代理的类
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()

#获取图片地址函数
def imgurlList(url_home):
global imgurl_list
home_page = urllib2.urlopen(url_home)
url_re = re.compile(r'

')
pic_re = re.compile(r' Python使用代理抓取网站图片（多线程）

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)

#下载图片的类
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] #获取图片后缀
pic_name = str(random.randint(0,10000000000))+'.'+pic_suffix
cookies = urllib2.HTTPCookieProcessor()
randomCheckedProxy = random.choice(checkedProxyList) #随机取一组代理服务器
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 = []

#对每个目标网站开启一个线程负责抓取代理
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+"总共抓取了%s个代理" %len(rawProxyList) +'.'*10

#开启20个线程负责校验，将抓取到的代理分成20份，每个线程校验一份
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+"总共有%s个代理通过校验" %len(checkedProxyList) +'.'*10

#开启20个线程随机取一个代理下载图片
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+"总共有%s个图片下载" %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()

二、测试结果：