詳解用python實現爬取CSDN熱門評論URL并存入redis
下載谷歌瀏覽器驅動,并配置好
import timeimport randomfrom PIL import Imagefrom selenium import webdriverfrom selenium.webdriver.common.by import Byfrom selenium.webdriver.support.ui import WebDriverWaitfrom selenium.webdriver.support import expected_conditions as ECif __name__ == ’__main__’: options = webdriver.ChromeOptions() options.binary_location = r’C:UsershhhAppDataLocalGoogleChromeApplication谷歌瀏覽器.exe’ # driver=webdriver.Chrome(executable_path=r’D:360Chromechromedriverchromedriver.exe’) driver = webdriver.Chrome(options=options) #以java模塊為例 driver.get(’https://www.csdn.net/nav/java’) for i in range(1,20): driver.execute_script('window.scrollTo(0, document.body.scrollHeight)') time.sleep(2)二、獲取URL
from bs4 import BeautifulSoupfrom lxml import etree html = etree.HTML(driver.page_source)# soup = BeautifulSoup(html, ’lxml’)# soup_herf=soup.find_all('#feedlist_id > li:nth-child(1) > div > div > h2 > a')# soup_herftitle = html.xpath(’//*[@id='feedlist_id']/li/div/div/h2/a/@href’)
可以看到,一下爬取了很多,速度非常快
導入redis包后,配置redis端口和redis數據庫,用rpush函數寫入打開redis
import redisr_link = redis.Redis(port=’6379’, host=’localhost’, decode_responses=True, db=1)for u in title: print('準備寫入{}'.format(u)) r_link.rpush('csdn_url', u) print('{}寫入成功!'.format(u))print(’=’ * 30, ’n’, '共計寫入url:{}個'.format(len(title)), ’n’, ’=’ * 30)
大功告成!
在Redis Desktop Manager中可以看到,爬取和寫入都是非常的快。
要使用只需用rpop出棧就OK
one_url = r_link.rpop('csdn_url)')while one_url: print('{}被彈出!'.format(one_url))
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