python基于queue和threading实现多线程下载实例

本文实例讲述了python基于queue和threading实现多线程下载的方法,分享给大家供大家参考。具体方法如下:

主代码如下:

#download worker

queue_download = Queue.Queue(0)

DOWNLOAD_WORKERS = 20

for i in range(DOWNLOAD_WORKERS):

DownloadWorker(queue_download).start() #start a download worker

for md5 in MD5S:

queue_download.put(md5)

for i in range(DOWNLOAD_WORKERS):

queue_download.put(None)

其中downloadworkers.py

类继承 threading.Thread,重载run方法..在__init__中调用threading.Thread.__init__(self),

在run方法中实现耗时的操作

import threading

import Queue

import md5query

import DOM

import os,sys

class DownloadWorker(threading.Thread):

""""""

def __init__(self, queue):

"""Constructor"""

self.__queue = queue

threading.Thread.__init__(self)

def run(self):

while 1:

md5 = self.__queue.get()

if md5 is None:

break #reached end of queue

#this is a time-cost produce

self._down(md5)

print "task:", md5, "finished"

def _down(self, md5):

config = {

'input':sys.stdin,

'output':'./samples',

'location':'xxx',

'has-fn':False,

'options':{'connect.timeout':60, 'timeout':3600},

'log':file('logs.txt', 'w'),

}

print 'download %s...' % (md5)

try:

data = downloadproc(config['location'], config['options'])#我的下载过程

if data:

dom, fileData = md5query.splited(data)

filename = md5

if config['has-fn']:

filename = '%s_%s' % (md5, dom.nodeValue2('xxxxxxx', '').encode('utf-8'))#这是我的下载的方法

f = file(os.path.join(config['output'], filename), 'w')

f.write(fileData)

f.close()

print '%s\tok' % (md5)

else:

print>>config['log'], '%s\t%s' % (md5, 'failed')

except Exception, e:

print>>config['log'], '%s\t%s' % (md5, str(e))

希望本文所述对大家的Python程序设计有所帮助。

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