1.scrapy_splash是scrapy的一个组件

scrapy_splash加载js数据基于Splash来实现的

Splash是一个Javascrapy渲染服务，它是一个实现HTTP API的轻量级浏览器，Splash是用Python和Lua语言实现的，基于Twisted和QT等模块构建

使用scrapy-splash最终拿到的response相当于是在浏览器全部渲染完成以后的网页源代码

2.scrapy_splash的作用

scrpay_splash能够模拟浏览器加载js，并返回js运行后的数据

3.scrapy_splash的环境安装

3.1 使用splash的docker镜像

docker info 查看docker信息

docker images  查看所有镜像

docker pull scrapinghub/splash  安装scrapinghub/splash

docker run -p 8050:8050 scrapinghub/splash &  指定8050端口运行

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.测试代码：

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js请求：

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