生产者消费者模式

通用代码

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


class Producer(threading.Thread):
    headers = {
        "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36",
    }

    def __init__(self, page_queue, img_queue, *args, **kwargs):
        super(Producer, 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=url,headers=self.headers)
        text = response.text
        html = etree.HTML(text)

        img_list = html.xpath('//div[@class="page-content text-center"]/div/a/img')
        for img in img_list:
            img_url = img.xpath('./@data-original')[0]
            img_name = img.xpath('./@alt')[0]+'.jpg'
            self.img_queue.put((img_url, img_name))




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.page_queue.empty() and self.img_queue.empty():
                break
            img_url, img_name = self.img_queue.get()
            request.urlretrieve(img_url, "./imgs/" + img_name)
            print(img_name + " 下载完成！")

# 定义一个主方法，该方法向处理方法中传值
def main():
    page_queue = Queue(50) #存储页码链接
    img_queue = Queue(100)#存储解析出来的图片链接
    #想要爬取前10页的数据
    for x in range(1, 11):
        url = "https://www.doutula.com/photo/list/?page=%d" % x
        page_queue.put(url) #将10页的页码链接加入到了page_queue

    for x in range(3):
        t = Producer(page_queue, img_queue)
        t.start()

    for x in range(3):
        t = Consumer(page_queue, img_queue)
        t.start()


if __name__ == '__main__':
    main()