python网络爬虫实战——实时抓取西刺免费代理ip

- 日理万妓 2021-09-10 12:56 395阅读 0赞

参考网上高手示例程序，利用了多线程技术，Python版本为2.7

#-*-coding:utf8-*-
    
    import urllib2
    import re
    import threading
    import time
    
    rawProxyList = []
    checkedProxyList = []
    
    #抓取代理网站
    targets=[]
    for i in range(1,6):
        target = r"http://www.xici.net.co/nn/%d" % i
        targets.append(target)
    # print targets
    
    #正则
    p = re.compile(r'''<tr class=".+?(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})</td>.+?(\d{2,4})</td>.+?<td>(.{4,5})</td>''',re.DOTALL)
    
    #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 "目标网站："+self.target
            req = urllib2.urlopen(self.target)
            result = req.read()
            matchs = p.findall(result)
            for row in matchs:
                ip = row[0]
                port = row[1]
                agent = row[2]
                addr=agent+'://'+ip+':'+port
                proxy = [ip,port,addr]
                rawProxyList.append(proxy)
    
        def run(self):
            self.getProxy()
    
    #检验代理类
    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])})
                opener=urllib2.build_opener(cookies,proxyHandler)
                opener.addheaders =[('User-Agent','Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36')]
                t1 = time.time()
                try:
                    req = opener.open(self.testUrl,timeout=self.timeout)
                    result=req.read()
                    timeused = time.time()-t1
                    pos = result.find(self.testStr)
    
                    if pos > 1:
                        checkedProxyList.append((proxy[0],proxy[1],proxy[2],timeused))
                    else:
                        continue
                except Exception,e:
                    continue
    
        def run(self):
            self.checkProxy()
    
    if __name__ == "__main__":
        getThreads=[]
        checkThreads=[]
    
    #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
    
    #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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