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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