python beautifulsoup多线程分析抓取网页

下面的代码用到了

1 python 多线程

2 网页分析库：beautifulsoup ,这个库比之前分享的python SGMLParser 网页分析库要强大很多，大家有兴趣可以去了解下。

#encoding=utf-8
#@description：蜘蛛抓取内容。

import Queue
import threading
import urllib,urllib2
import time
from BeautifulSoup import BeautifulSoup

hosts = ["http://www.baidu.com","http://www.163.com"]#要抓取的网页

queue = Queue.Queue()
out_queue = Queue.Queue()

class ThreadUrl(threading.Thread):
"""Threaded Url Grab"""
def __init__(self, queue, out_queue):
threading.Thread.__init__(self)
self.queue = queue
self.out_queue = out_queue

def run(self):
while True:
#grabs host from queue
host = self.queue.get()
proxy_support = urllib2.ProxyHandler({'http':'http://xxx.xxx.xxx.xxxx'})#代理IP
opener = urllib2.build_opener(proxy_support, urllib2.HTTPHandler)
urllib2.install_opener(opener)

#grabs urls of hosts and then grabs chunk of webpage
url = urllib.urlopen(host)
chunk = url.read()

#place chunk into out queue
self.out_queue.put(chunk)

#signals to queue job is done
self.queue.task_done()

class DatamineThread(threading.Thread):
"""Threaded Url Grab"""
def __init__(self, out_queue):
threading.Thread.__init__(self)
self.out_queue = out_queue

def run(self):
while True:
#grabs host from queue
chunk = self.out_queue.get()

#parse the chunk
soup = BeautifulSoup(chunk)
print soup.findAll(['title']))

#signals to queue job is done
self.out_queue.task_done()

start = time.time()
def main():

#spawn a pool of threads, and pass them queue instance

t = ThreadUrl(queue, out_queue)
t.setDaemon(True)
t.start()

#populate queue with data
for host in hosts:
queue.put(host)

dt = DatamineThread(out_queue)
dt.setDaemon(True)
dt.start()

#wait on the queue until everything has been processed
queue.join()
out_queue.join()

main()
print "Elapsed Time: %s" % (time.time() - start)

　　

运行上面的程序需要安装beautifulsoup, 这个是beautifulsou 文档，大家可以看看。