爬虫18-多线程爬虫

import requests
from lxml import etree
from urllib import request
import os
from queue import Queue
import threading

class Procuder(threading.Thread):
    headers = {
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36"
    }
    def __init__(self,page_queue,img_queue,*args,**kwargs):
        super(Procuder, self).__init__(*args,**kwargs)
        self.page_queue = page_queue
        self.img_queue = img_queue

    def run(self):
        while True:
            if self.page_queue.empty():
                break
            url = self.page_queue.get()
            self.parse_page(url)

    def parse_page(self,url):
        response = requests.get(url,headers=self.headers)
        text = response.text
        html = etree.HTML(text)
        imgs = html.xpath("//div[@class='page-content text-center']//img[@class!='gif']")
        for img in imgs:
            img_url = img.get('data-original')
            alt = img.get('alt')
            # alt = re.sub(r'[\?？\.，。！!\*]','',alt)
            suffix = os.path.splitext(img_url)[1]
            filename = alt + suffix
            self.img_queue.put((img_url,filename))

class Consumer(threading.Thread):
    def __init__(self,page_queue,img_queue,*args,**kwargs):
        super(Consumer, self).__init__(*args,**kwargs)
        self.page_queue = page_queue
        self.img_queue = img_queue

    def run(self):
        while True:
            if self.img_queue.empty() and self.page_queue.empty():
                break
            img_url,filename = self.img_queue.get()
            request.urlretrieve(img_url,'images/'+filename)
            print(filename+'  下载完成！')


def main():
    page_queue = Queue(100)
    img_queue = Queue(1000)
    for x in range(1,101):
        url = 'http://www.doutula.com/photo/list/?page=%d' % x
        page_queue.put(url)

    for x in range(5):
        t = Procuder(page_queue,img_queue)
        t.start()

    for x in range(5):
        t = Consumer(page_queue,img_queue)
        t.start()


if __name__ == '__main__':
    main()