scrapy-splash简单使用详解

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：

来源：https://blog.csdn.net/zhu6201976/article/details/106518029