scrapy实例三【豆瓣电影Top250】

本篇文章可能基于管道的文件保存有点问题，可以关闭管道直接在终端保存数据
保存为json
scrapy crawl db -o ./douban.json
保存为csv
scrapy crawl db -o ./douban.csv
spider.py

import scrapy
from douban.items import DoubanItem
import reclass DbSpider(scrapy.Spider):name = 'db'allowed_domains = ['movie.douban.com']start_urls = ['https://movie.douban.com/top250']def parse(self, response):list_li=response.xpath('//*[@id="content"]/div/div[1]/ol/li')for item in list_li:douban_item=DoubanItem()#序号douban_item["serial_number"]=item.xpath('./div/div[1]/em/text()').extract_first()#电影名称douban_item["movie_name"]=item.xpath('./div/div[2]/div[1]/a/span[1]/text()').extract_first()#电影介绍douban_item["introduce"]= item.xpath('./div/div[2]/div[2]/p/text()').extract_first().strip().replace("\xa0","")# 星级douban_item["star"]=item.xpath('./div/div[2]/div[2]/div/span[2]/text()').extract_first()#评论数douban_item["evaluate"]=item.xpath('./div/div[2]/div[2]/div/span[4]/text()').extract_first()# 电影描述douban_item['describe']=item.xpath('./div/div[2]/div[2]/p[2]/span/text()').extract_first()items={"序号":douban_item["serial_number"],"电影名称":douban_item["movie_name"],"电影介绍":douban_item["introduce"],"星级":douban_item["star"],"评论数":douban_item["evaluate"],"电影描述":douban_item['describe'],}print(items)yield items# 翻页请求next_url=response.xpath('//*[@id="content"]/div/div[1]/div[2]/a/@href').extract()for i in next_url:yield scrapy.Request("https://movie.douban.com/top250"+i,callback=self.parse)

items.py

# Define here the models for your scraped items
#
# See documentation in:
# https://docs.scrapy.org/en/latest/topics/items.htmlimport scrapyclass DoubanItem(scrapy.Item):# define the fields for your item here like:# name = scrapy.Field()#序号serial_number=scrapy.Field()#电影名称movie_name=scrapy.Field()#电影介绍introduce=scrapy.Field()#星级star=scrapy.Field()#评论数evaluate=scrapy.Field()#电影描述describe=scrapy.Field()

pipelines.py

# 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# useful for handling different item types with a single interface
from itemadapter import ItemAdapterimport json
class DoubanPipeline:fp=Nonedef open_spider(self,spider):self.fp=open('./douban.json','w',encoding='utf-8')def process_item(self, item, spider):json_itme=json.dumps(item,ensure_ascii=False)self.fp.write(json_itme+"\n")print(item)return itemdef close_spider(self,spider):self.fp.close()

settings.py

# Scrapy settings for douban 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.htmlBOT_NAME = 'douban'SPIDER_MODULES = ['douban.spiders']
NEWSPIDER_MODULE = 'douban.spiders'# Crawl responsibly by identifying yourself (and your website) on the user-agent
USER_AGENT = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36'# Obey robots.txt rules
ROBOTSTXT_OBEY = False
LOG_LEVEL="ERROR"# 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 = 0.5
# 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',
#}# Enable or disable spider middlewares
# See https://docs.scrapy.org/en/latest/topics/spider-middleware.html
#SPIDER_MIDDLEWARES = {#    'douban.middlewares.DoubanSpiderMiddleware': 543,
#}# Enable or disable downloader middlewares
# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
#DOWNLOADER_MIDDLEWARES = {#    'douban.middlewares.DoubanDownloaderMiddleware': 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 = {'douban.pipelines.DoubanPipeline': 300,
}
FEED_EXPORTENCODING="utf-8"
# 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'

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