最近在用python做一些网页分析方面的事情,很久没更新博客了,今天补上。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。

今天分享python beautifulsoup多线程分析抓取网页就到这里了,有什么运行问题可以发到下面的评论里。大家相互讨论。

文章出自:http://www.ibm.com/developerworks/cn/aix/library/au-threadingpython/


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