详解用python实现爬取CSDN热门评论URL并存入redis

一、配置webdriver

下载谷歌浏览器驱动，并配置好

import time
import random
from pil import image
from selenium import webdriver
from selenium.webdriver.common.by import by
from selenium.webdriver.support.ui import webdriverwait
from selenium.webdriver.support import expected_conditions as ec
if __name__ == '__main__':
  options = webdriver.chromeoptions()
  options.binary_location = r'c:\users\hhh\appdata\local\google\chrome\application\谷歌浏览器.exe'
  # driver=webdriver.chrome(executable_path=r'd:\360chrome\chromedriver\chromedriver.exe')
  driver = webdriver.chrome(options=options)
  #以java模块为例
  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、获取url

from bs4 import beautifulsoup
from 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_herf
title = 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

三、写入redis

导入redis包后，配置redis端口和redis数据库，用rpush函数写入
打开redis

import redis
r_link = redis.redis(port='6379', host='localhost', decode_responses=true, db=1)
for u in title:
    print("准备写入{}".format(u))
    r_link.rpush("csdn_url", u)
    print("{}写入成功!".format(u))
print('=' * 30, '\n', "共计写入url：{}个".format(len(title)), '\n', '=' * 30)

大功告成！

在redis desktop manager中可以看到，爬取和写入都是非常的快。

要使用只需用rpop出栈就ok

one_url = r_link.rpop("csdn_url)")
while one_url:
  print("{}被弹出！".format(one_url))

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