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:
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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'
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3.4.scrapy 使用
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from scrapy_splash import SplashRequest
yield SplashRequest( self .start_urls[ 0 ], callback = self .parse, args = { 'wait' : 0.5 })
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4.测试代码:
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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' ))
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scrapy-splash接收到js请求:
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原文链接:https://blog.csdn.net/zhu6201976/article/details/106518029