Scrapy加Selenium爬取简书

爬虫主体：

# -*- coding: utf-8 -*-
import scrapy
from scrapy.linkextractors import LinkExtractor
from scrapy.spiders import CrawlSpider, Rule
from js_spi.items import ArticleItem


class JsSpider(CrawlSpider):
    name = 'js'
    allowed_domains = ['jianshu.com']
    start_urls = ['https://www.jianshu.com/']

    rules = (
        Rule(LinkExtractor(allow=r'.*/p/[0-9a-z]{12}.*'), callback='parse_page', follow=True),
    )

    def parse_page(self, response):
        title = response.xpath('//section[@class="ouvJEz"]/h1/text()').get()
        author = response.xpath('//span[@class="FxYr8x"]/a/text()').get()
        edit_time = response.xpath('//div[@class="s-dsoj"]//time/text()').get()
        content = response.xpath('//article[@class="_2rhmJa"]').getall()
        fav_count = response.xpath('//span[@class="_1LOh_5"]/text()').get()
        text_type = '|'.join(response.xpath('//a[@class="_3s5t0Q _1OhGeD"]/span/text()').getall())
        item = ArticleItem(title=title,
                           author=author,
                           edit_time=edit_time,
                           content=content,
                           fav_count=fav_count,
                           text_type=text_type)
        yield item

item：

# -*- coding: utf-8 -*-

# Define here the models for your scraped items
#
# See documentation in:
# https://docs.scrapy.org/en/latest/topics/items.html

import scrapy


class ArticleItem(scrapy.Item):
    # define the fields for your item here like:
    # name = scrapy.Field()
    title = scrapy.Field()
    author = scrapy.Field()
    edit_time = scrapy.Field()
    content = scrapy.Field()
    fav_count = scrapy.Field()
    text_type = scrapy.Field()

    # article_id = scrapy.Field()
    # origin_url = scrapy.Field()

middleware：

# -*- coding: utf-8 -*-

# Define here the models for your spider middleware
#
# See documentation in:
# https://docs.scrapy.org/en/latest/topics/spider-middleware.html

from scrapy import signals
from selenium import webdriver
import time
from scrapy.http.response.html import HtmlResponse


class SeleniumDownloadMiddleware(object):
    def __init__(self):
        self.driver = webdriver.Chrome(executable_path=r'C:\ChromeDriver\chromedriver.exe')

    def process_request(self, request, spider):
        self.driver.get(request.url)
        time.sleep(1)
        try:
            while True:
                show_more = self.driver.find_element_by_class_name('H7E3vT')
                show_more.click()
                time.sleep(0.3)
                if not show_more:
                    break
        except:
            pass
        return HtmlResponse(url=request.url,
                            body=self.driver.page_source,
                            request=request,
                            encoding='utf-8',
                            status=200)

pipeline:

# -*- coding: utf-8 -*-

# Define your item pipelines here
#
# Don't forget to add your pipeline to the ITEM_PIPELINES setting
# See: https://docs.scrapy.org/en/latest/topics/item-pipeline.html
from scrapy.exporters import JsonLinesItemExporter


class JsSpiPipeline(object):
    def open_spider(self,spider):
        self.js=open('./js.json','wb')
        self.exporter = JsonLinesItemExporter(self.js,ensure_ascii=False,encoding='utf-8')

    def process_item(self, item, spider):
        self.exporter.export_item(item)
        return item

    def close_spider(self,spider):
        self.js.close()

settings:

# -*- coding: utf-8 -*-

# Scrapy settings for js_spi project
#
# For simplicity, this file contains only settings considered important or
# commonly used. You can find more settings consulting the documentation:
#
#     https://docs.scrapy.org/en/latest/topics/settings.html
#     https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
#     https://docs.scrapy.org/en/latest/topics/spider-middleware.html

BOT_NAME = 'js_spi'

SPIDER_MODULES = ['js_spi.spiders']
NEWSPIDER_MODULE = 'js_spi.spiders'


# Crawl responsibly by identifying yourself (and your website) on the user-agent
#USER_AGENT = 'js_spi (+http://www.yourdomain.com)'

# Obey robots.txt rules
ROBOTSTXT_OBEY = False

# Configure maximum concurrent requests performed by Scrapy (default: 16)
#CONCURRENT_REQUESTS = 32

# Configure a delay for requests for the same website (default: 0)
# See https://docs.scrapy.org/en/latest/topics/settings.html#download-delay
# See also autothrottle settings and docs
# DOWNLOAD_DELAY = 3
# The download delay setting will honor only one of:
#CONCURRENT_REQUESTS_PER_DOMAIN = 16
#CONCURRENT_REQUESTS_PER_IP = 16

# Disable cookies (enabled by default)
#COOKIES_ENABLED = False

# Disable Telnet Console (enabled by default)
#TELNETCONSOLE_ENABLED = False

# Override the default request headers:
DEFAULT_REQUEST_HEADERS = {
  'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
  'Accept-Language': 'en',
'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36'
}

# Enable or disable spider middlewares
# See https://docs.scrapy.org/en/latest/topics/spider-middleware.html
# SPIDER_MIDDLEWARES = {
#    'js_spi.middlewares.SeleniumDownloadMiddleware': 543,
# }

# Enable or disable downloader middlewares
# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
DOWNLOADER_MIDDLEWARES = {
   'js_spi.middlewares.SeleniumDownloadMiddleware': 543,
}

# Enable or disable extensions
# See https://docs.scrapy.org/en/latest/topics/extensions.html
#EXTENSIONS = {
#    'scrapy.extensions.telnet.TelnetConsole': None,
#}

# Configure item pipelines
# See https://docs.scrapy.org/en/latest/topics/item-pipeline.html
ITEM_PIPELINES = {
   'js_spi.pipelines.JsSpiPipeline': 300,
}

# Enable and configure the AutoThrottle extension (disabled by default)
# See https://docs.scrapy.org/en/latest/topics/autothrottle.html
#AUTOTHROTTLE_ENABLED = True
# The initial download delay
#AUTOTHROTTLE_START_DELAY = 5
# The maximum download delay to be set in case of high latencies
#AUTOTHROTTLE_MAX_DELAY = 60
# The average number of requests Scrapy should be sending in parallel to
# each remote server
#AUTOTHROTTLE_TARGET_CONCURRENCY = 1.0
# Enable showing throttling stats for every response received:
#AUTOTHROTTLE_DEBUG = False

# Enable and configure HTTP caching (disabled by default)
# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html#httpcache-middleware-settings
#HTTPCACHE_ENABLED = True
#HTTPCACHE_EXPIRATION_SECS = 0
#HTTPCACHE_DIR = 'httpcache'
#HTTPCACHE_IGNORE_HTTP_CODES = []
#HTTPCACHE_STORAGE = 'scrapy.extensions.httpcache.FilesystemCacheStorage'