使用scrapy ImagesPipeline爬取图片资源-白红宇

这是一个使用scrapy的ImagesPipeline爬取下载图片的示例，生成的图片保存在爬虫的full文件夹里。

scrapy startproject DoubanImgs

cd DoubanImgs

scrapy genspider download_douban douban.com

vim spiders/download_douban.py

# coding=utf-8from scrapy.spiders import Spiderimport refrom scrapy import Requestfrom ..items import DoubanImgsItemclass download_douban(Spider):    name = 'download_douban'    default_headers = {        'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',        'Accept-Encoding': 'gzip, deflate, sdch, br',        'Accept-Language': 'zh-CN,zh;q=0.8,en;q=0.6',        'Cache-Control': 'max-age=0',        'Connection': 'keep-alive',        'Host': 'www.douban.com',        'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36',    }    def __init__(self, url='1638835355', *args, **kwargs):        self.allowed_domains = ['douban.com']        self.start_urls = []        for i in xrange(23):            if i == 0:                page_url = 'http://www.douban.com/photos/album/' + url            else:                page_url = 'http://www.douban.com/photos/album/' + url + '/?start=' + str(i*18)            self.start_urls.append(page_url)        self.url = url        # call the father base function        # super(download_douban, self).__init__(*args, **kwargs)    def start_requests(self):        for url in self.start_urls:            yield Request(url=url, headers=self.default_headers, callback=self.parse)    def parse(self, response):        list_imgs = response.xpath('//div[@class="photolst clearfix"]//img/@src').extract()        if list_imgs:            item = DoubanImgsItem()            item['image_urls'] = list_imgs            yield item

vim settings.py

# -*- coding: utf-8 -*-# Scrapy settings for DoubanImgs project## For simplicity, this file contains only settings considered important or# commonly used. You can find more settings consulting the documentation:##     https://doc.scrapy.org/en/latest/topics/settings.html#     https://doc.scrapy.org/en/latest/topics/downloader-middleware.html#     https://doc.scrapy.org/en/latest/topics/spider-middleware.htmlBOT_NAME = 'DoubanImgs'SPIDER_MODULES = ['DoubanImgs.spiders']NEWSPIDER_MODULE = 'DoubanImgs.spiders'ITEM_PIPELINES = {    'DoubanImgs.pipelines.DoubanImgDownloadPipeline': 300,}IMAGES_STORE = '.'IMAGES_EXPIRES = 90# Crawl responsibly by identifying yourself (and your website) on the user-agent#USER_AGENT = 'DoubanImgs (+http://www.yourdomain.com)'# Obey robots.txt rulesROBOTSTXT_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://doc.scrapy.org/en/latest/topics/settings.html#download-delay# See also autothrottle settings and docsDOWNLOAD_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://doc.scrapy.org/en/latest/topics/spider-middleware.html#SPIDER_MIDDLEWARES = {#    'DoubanImgs.middlewares.DoubanimgsSpiderMiddleware': 543,#}# Enable or disable downloader middlewares# See https://doc.scrapy.org/en/latest/topics/downloader-middleware.html#DOWNLOADER_MIDDLEWARES = {#    'DoubanImgs.middlewares.DoubanimgsDownloaderMiddleware': 543,#}# Enable or disable extensions# See https://doc.scrapy.org/en/latest/topics/extensions.html#EXTENSIONS = {#    'scrapy.extensions.telnet.TelnetConsole': None,#}# Configure item pipelines# See https://doc.scrapy.org/en/latest/topics/item-pipeline.html#ITEM_PIPELINES = {#    'DoubanImgs.pipelines.DoubanimgsPipeline': 300,#}# Enable and configure the AutoThrottle extension (disabled by default)# See https://doc.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://doc.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'

vim items.py

# -*- coding: utf-8 -*-# Define here the models for your scraped items## See documentation in:# https://doc.scrapy.org/en/latest/topics/items.htmlimport scrapyfrom scrapy import Fieldclass DoubanImgsItem(scrapy.Item):    # define the fields for your item here like:    # name = scrapy.Field()    image_urls = Field()    images = Field()    image_paths = Field()

vim pipelines.py

# -*- coding: utf-8 -*-# Define your item pipelines here## Don't forget to add your pipeline to the ITEM_PIPELINES setting# See: http://doc.scrapy.org/en/latest/topics/item-pipeline.htmlfrom scrapy.pipelines.images import ImagesPipelinefrom scrapy.exceptions import DropItemfrom scrapy import Requestfrom scrapy import logclass DoubanImgsPipeline(object):    def process_item(self, item, spider):        return itemclass DoubanImgDownloadPipeline(ImagesPipeline):    default_headers = {        'accept': 'image/webp,image/*,*/*;q=0.8',        'accept-encoding': 'gzip, deflate, sdch, br',        'accept-language': 'zh-CN,zh;q=0.8,en;q=0.6',        'cookie': 'bid=yQdC/AzTaCw',        'referer': 'https://www.douban.com/photos/photo/2370443040/',        'user-agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36',    }    def get_media_requests(self, item, info):        for image_url in item['image_urls']:            self.default_headers['referer'] = image_url            yield Request(image_url, headers=self.default_headers)    def item_completed(self, results, item, info):        image_paths = [x['path'] for ok, x in results if ok]        if not image_paths:            raise DropItem("Item contains no images")        item['image_paths'] = image_paths        return item