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python 多线程 爬虫

时间:2015-11-12 18:27:31      阅读:251      评论:0      收藏:0      [点我收藏+]
# coding=utf-8

import urllib2 as request
import re
import os

import threading,time,random


####

config_url_paths = [
    r‘‘‘http://image.baidu.com/‘‘‘,
    ]
config_save_path = r‘‘‘D:\\video\\t\\web\\image_cool\\52\\‘‘‘


re_fliter_jpg_full_path = re.compile(r‘src="(.+?\.jpg)"‘)
re_filter_jpg_name = re.compile(r‘/([^/]+\.jpg)‘)




class jpg_downloader(threading.Thread):
    def __init__(self, url, filename):
        global cnt_threads,mutex
        threading.Thread.__init__(self)
        
        cnt_threads = cnt_threads + 1

        savepath = config_save_path + filename;
        self._url = url;
        self._savepath = savepath;
        self._id = cnt_threads;
        print(‘cnt:‘+str(self._id)+‘  url:‘+url+‘  path:‘+savepath+‘\r\n‘);
    def run(self):
#        global count,mutex
#        threadname = threading.currentThread.getName();    
        jpg = request.urlopen(self._url).read()
        print(str(self._id) + ‘download finish \r\n‘)        
        File = open(self._savepath,‘wb‘)
        File.write(jpg)
        File.flush()
        File.close()
        print(str(self._id) + ‘thread_end \r\n‘)
        



def get_html(url):
    page = request.urlopen(url)
    html = page.read()
    return html


def getImg(html):
    imglist = re.findall(re_fliter_jpg_full_path,html)
    return imglist
 
 
def downloads(urls): 
    global cnt_threads,mutex
    cnt = 0
    threads = []
    cnt_threads = 0;
    mutex = threading.Lock()
    for url in urls:
        filename = re.search(re_filter_jpg_name,url).group(1)
        filename = ‘%03d‘%cnt + "-" + filename

        threads.append(jpg_downloader(url,filename));
        cnt = cnt + 1

    for t in threads:
        t.start()
    for t in threads:
        t.join()
        print(‘join‘)
    return


print(‘hello ready to start‘)
img_list = []
for url in config_url_paths:
    html = get_html(url)
    img_targets = getImg(html)
    for img in img_targets:
        img_list.append(img)

print(len(img_list))

downloads(img_list)

print("finish")


python 多线程 爬虫

原文:http://my.oschina.net/mummy108/blog/529508

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