Python实现多并发访问网站功能示例

本文实例讲述了Python实现多并发访问网站功能。分享给大家供大家参考，具体如下：

    # Filename:visitweb_threads.py
    # Description:python visit web, get startTime, endTime, everytimes spentTime,threading
    import threading
    import urllib
    import time
    import datetime
    print 'num    web       SpentTime'
    def Process(url,n):
      minSpan = 0.0
      maxSpan = 0.0
      sumSpan= 0.0
      over1s = 0
      file = open('data.txt','a') # save Data
      for i in range(n):
        startTime =datetime.datetime.now()
        try:
          urlItem = urllib.urlopen(url)
          htmSource = urlItem.read()
          urlItem.close()
        except:
          pass
        endTime = datetime.datetime.now()
        span = (endTime-startTime).total_seconds()
        sumSpan = sumSpan + span
        if span < minSpan:
          minSpan = span
        if span > maxSpan:
          maxSpan = span
        if span>1:
          over1s=over1s + 1
        print(u'%4d %s Spent:%7s seconds'%(i,url,span))
        file.write(u'%4d %s ST:%s ET:%s Spent :%s seconds\n'%(i,url,startTime,endTime,span))
      file.write('\n')
      print(u'\n requested:%s times\n Total Spent:%s seconds\n avg:%s seconds\n max:%s seconds\n min:%s seconds\n over 1 secnod:%s times\n'%(n,sumSpan,sumSpan/n,maxSpan,minSpan,over1s))
      file.write(u' requested:%s times\n Total Spent:%s seconds\n avg:%s seconds\n max:%s seconds\n min:%s seconds\n over 1 secnod:%s times\n'%(n,sumSpan,sumSpan/n,maxSpan,minSpan,over1s))
      file.close()
    class ThreadClass(threading.Thread):
      def run(self):
        now = datetime.datetime.now()
        print "%s says Hello World at time: %s" % (self.getName(), now)
        file = open('threads_data.txt','a') # save threads_data
        file.write( "%s says Hello World at time: %s\n" % (self.getName(), now))
        Process('http://222.20.6.184/main.aspx',10) # visit website 网站的Url和每个进程的访问次数
        now = datetime.datetime.now()
        print "%s says Goodbye at time: %s" % (self.getName(), now)
        file.write( "%s says Goodbye at time: %s\n" % (self.getName(), now))
        file.close()
    if __name__=='__main__':
    #  file = open('threads_data.txt','w')
    #  file.close()
    #  file = open('data.txt','w')
    #  file.close()
      for i in range(1000): # 多少次同时并发访问
        t = ThreadClass()
        t.start()

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希望本文所述对大家Python程序设计有所帮助。