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()

希望本文所述对大家Python程序设计有所帮助。