1、spider.py
# -*- coding: utf-8 -*- import scrapy from ..items import BigfileItem class ChoutiSpider(scrapy.Spider): name = "chouti" allowed_domains = ["chouti.com"] start_urls = ( 'http://www.chouti.com/', ) def parse(self, response): yield BigfileItem(url='https://wx1.sinaimg.cn/large/8a04ef95ly1frbvy0d2opj20j00tm0vt.jpg',type='file',file_name='xx.jpg')
2、items.py
import scrapy class BigfileItem(scrapy.Item): # define the fields for your item here like: # name = scrapy.Field() url = scrapy.Field() type = scrapy.Field() file_name = scrapy.Field()
3、pipelines
# -*- 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.html from twisted.web.client import Agent, getPage, ResponseDone, PotentialDataLoss from twisted.internet import defer, reactor, protocol from twisted.web._newclient import Response from io import BytesIO class _ResponseReader(protocol.Protocol): def __init__(self, finished, txresponse, file_name): self._finished = finished self._txresponse = txresponse self._bytes_received = 0 self.f = open(file_name, mode='wb') def dataReceived(self, bodyBytes): self._bytes_received += len(bodyBytes) # 一点一点的下载 self.f.write(bodyBytes) self.f.flush() def connectionLost(self, reason): if self._finished.called: return if reason.check(ResponseDone): # 下载完成 self._finished.callback((self._txresponse, 'success')) elif reason.check(PotentialDataLoss): # 下载部分 self._finished.callback((self._txresponse, 'partial')) else: # 下载异常 self._finished.errback(reason) self.f.close() class BigfilePipeline(object): def process_item(self, item, spider): # 创建一个下载文件的任务 if item['type'] == 'file': agent = Agent(reactor) d = agent.request( method=b'GET', uri=bytes(item['url'], encoding='ascii') ) # 当文件开始下载之后，自动执行 self._cb_bodyready 方法 d.addCallback(self._cb_bodyready, file_name=item['file_name']) return d else: return item def _cb_bodyready(self, txresponse, file_name): # 创建 Deferred 对象，控制直到下载完成后，再关闭链接 d = defer.Deferred() d.addBoth(self.download_result) # 下载完成/异常/错误之后执行的回调函数 txresponse.deliverBody(_ResponseReader(d, txresponse, file_name)) return d def download_result(self, response): pass
4、setting
# -*- coding: utf-8 -*- # Scrapy settings for bigfile project # # For simplicity, this file contains only settings considered important or # commonly used. You can find more settings consulting the documentation: # # http://doc.scrapy.org/en/latest/topics/settings.html # http://scrapy.readthedocs.org/en/latest/topics/downloader-middleware.html # http://scrapy.readthedocs.org/en/latest/topics/spider-middleware.html BOT_NAME = 'bigfile' SPIDER_MODULES = ['bigfile.spiders'] NEWSPIDER_MODULE = 'bigfile.spiders' # Crawl responsibly by identifying yourself (and your website) on the user-agent #USER_AGENT = 'bigfile (+http://www.yourdomain.com)' # Obey robots.txt rules ROBOTSTXT_OBEY = True # Configure maximum concurrent requests performed by Scrapy (default: 16) #CONCURRENT_REQUESTS = 32 # Configure a delay for requests for the same website (default: 0) # See http://scrapy.readthedocs.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', #} # Enable or disable spider middlewares # See http://scrapy.readthedocs.org/en/latest/topics/spider-middleware.html #SPIDER_MIDDLEWARES = { # 'bigfile.middlewares.MyCustomSpiderMiddleware': 543, #} # Enable or disable downloader middlewares # See http://scrapy.readthedocs.org/en/latest/topics/downloader-middleware.html #DOWNLOADER_MIDDLEWARES = { # 'bigfile.middlewares.MyCustomDownloaderMiddleware': 543, #} # Enable or disable extensions # See http://scrapy.readthedocs.org/en/latest/topics/extensions.html #EXTENSIONS = { # 'scrapy.extensions.telnet.TelnetConsole': None, #} # Configure item pipelines # See http://scrapy.readthedocs.org/en/latest/topics/item-pipeline.html ITEM_PIPELINES = { 'bigfile.pipelines.BigfilePipeline': 300, } # Enable and configure the AutoThrottle extension (disabled by default) # See http://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 http://scrapy.readthedocs.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'
5、scrapy.cfg
# Automatically created by: scrapy startproject # # For more information about the [deploy] section see: # https://scrapyd.readthedocs.org/en/latest/deploy.html [settings] default = bigfile.settings [deploy] #url = http://localhost:6800/ project = bigfile