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scrapy-splash簡(jiǎn)單使用詳解

更新時(shí)間：2021年02月21日 08:53:12 作者：zhu6201976-朱華龍

這篇文章主要介紹了scrapy-splash簡(jiǎn)單使用詳解，文中通過(guò)示例代碼介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值，需要的朋友們下面隨著小編來(lái)一起學(xué)習(xí)學(xué)習(xí)吧

1.scrapy_splash是scrapy的一個(gè)組件

scrapy_splash加載js數(shù)據(jù)基于Splash來(lái)實(shí)現(xiàn)的

Splash是一個(gè)Javascrapy渲染服務(wù)，它是一個(gè)實(shí)現(xiàn)HTTP API的輕量級(jí)瀏覽器，Splash是用Python和Lua語(yǔ)言實(shí)現(xiàn)的，基于Twisted和QT等模塊構(gòu)建

使用scrapy-splash最終拿到的response相當(dāng)于是在瀏覽器全部渲染完成以后的網(wǎng)頁(yè)源代碼

2.scrapy_splash的作用

scrpay_splash能夠模擬瀏覽器加載js，并返回js運(yùn)行后的數(shù)據(jù)

3.scrapy_splash的環(huán)境安裝

3.1 使用splash的docker鏡像

docker info 查看docker信息

docker images 查看所有鏡像

docker pull scrapinghub/splash 安裝scrapinghub/splash

docker run -p 8050:8050 scrapinghub/splash & 指定8050端口運(yùn)行

3.2.pip install scrapy-splash

3.3.scrapy 配置:

  SPLASH_URL = 'http://localhost:8050'
  DOWNLOADER_MIDDLEWARES = {
    'scrapy_splash.SplashCookiesMiddleware': 723,
    'scrapy_splash.SplashMiddleware': 725,
    'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware': 810,
  }
  SPIDER_MIDDLEWARES = {
    'scrapy_splash.SplashDeduplicateArgsMiddleware': 100,
  }
  DUPEFILTER_CLASS = 'scrapy_splash.SplashAwareDupeFilter'
  HTTPCACHE_STORAGE = 'scrapy_splash.SplashAwareFSCacheStorage'

3.4.scrapy 使用

from scrapy_splash import SplashRequest
yield SplashRequest(self.start_urls[0], callback=self.parse, args={'wait': 0.5})

4.測(cè)試代碼：

import datetime
import os
 
import scrapy
from scrapy_splash import SplashRequest
 
from ..settings import LOG_DIR
 
 
class SplashSpider(scrapy.Spider):
  name = 'splash'
  allowed_domains = ['biqugedu.com']
  start_urls = ['http://www.biqugedu.com/0_25/']
 
  custom_settings = {
    'LOG_FILE': os.path.join(LOG_DIR, '%s_%s.log' % (name, datetime.date.today().strftime('%Y-%m-%d'))),
    'LOG_LEVEL': 'INFO',
    'CONCURRENT_REQUESTS': 8,
    'AUTOTHROTTLE_ENABLED': True,
    'AUTOTHROTTLE_TARGET_CONCURRENCY': 8,
 
    'SPLASH_URL': 'http://localhost:8050',
    'DOWNLOADER_MIDDLEWARES': {
      'scrapy_splash.SplashCookiesMiddleware': 723,
      'scrapy_splash.SplashMiddleware': 725,
      'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware': 810,
    },
    'SPIDER_MIDDLEWARES': {
      'scrapy_splash.SplashDeduplicateArgsMiddleware': 100,
    },
    'DUPEFILTER_CLASS': 'scrapy_splash.SplashAwareDupeFilter',
    'HTTPCACHE_STORAGE': 'scrapy_splash.SplashAwareFSCacheStorage',
 
  }
 
  def start_requests(self):
    yield SplashRequest(self.start_urls[0], callback=self.parse, args={'wait': 0.5})
 
  def parse(self, response):
    """
    :param response:
    :return:
    """
    response_str = response.body.decode('utf-8', 'ignore')
    self.logger.info(response_str)
    self.logger.info(response_str.find('http://www.biqugedu.com/files/article/image/0/25/25s.jpg'))

scrapy-splash接收到j(luò)s請(qǐng)求：