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Scrapy
一、安装
Linux pip3 install scrapy Windows a. pip3 install wheel b. 下载twisted http://www.lfd.uci.edu/~gohlke/pythonlibs/#twisted c. 进入下载目录，执行 pip3 install Twisted?17.1.0?cp35?cp35m?win_amd64.whl d. pip3 install scrapy e. 下载并安装pywin32：https://sourceforge.net/projects/pywin32/files/
二、简介
Scrapy是一个为了爬取网站数据，提取结构性数据而编写的应用框架。 其可以应用在数据挖掘，信息处理或存储历史数据等一系列的程序中。其最初是为了页面抓取 (更确切来说, 网络抓取 )所设计的， 也可以应用在获取API所返回的数据(例如 Amazon Associates Web Services ) 或者通用的网络爬虫。Scrapy用途广泛，可以用于数据挖掘、监测和自动化测试。Scrapy 使用了 Twisted异步网络库来处理网络通讯。整体架构大致如下
Scrapy主要包括了以下组件：
- 引擎(Scrapy)
用来处理整个系统的数据流处理, 触发事务(框架核心) - 调度器(Scheduler)
用来接受引擎发过来的请求, 压入队列中, 并在引擎再次请求的时候返回. 可以想像成一个URL（抓取网页的网址或者说是链接）的优先队列, 由它来决定下一个要抓取的网址是什么, 同时去除重复的网址 - 下载器(Downloader)
用于下载网页内容, 并将网页内容返回给蜘蛛(Scrapy下载器是建立在twisted这个高效的异步模型上的) - 爬虫(Spiders)
爬虫是主要干活的, 用于从特定的网页中提取自己需要的信息, 即所谓的实体(Item)。用户也可以从中提取出链接,让Scrapy继续抓取下一个页面 - 项目管道(Pipeline)
负责处理爬虫从网页中抽取的实体，主要的功能是持久化实体、验证实体的有效性、清除不需要的信息。当页面被爬虫解析后，将被发送到项目管道，并经过几个特定的次序处理数据。 - 下载器中间件(Downloader Middlewares)
位于Scrapy引擎和下载器之间的框架，主要是处理Scrapy引擎与下载器之间的请求及响应。 - 爬虫中间件(Spider Middlewares)
介于Scrapy引擎和爬虫之间的框架，主要工作是处理蜘蛛的响应输入和请求输出。 - 调度中间件(Scheduler Middewares)
介于Scrapy引擎和调度之间的中间件，从Scrapy引擎发送到调度的请求和响应。
Scrapy运行流程大概如下：
- 引擎从调度器中取出一个链接(URL)用于接下来的抓取
- 引擎把URL封装成一个请求(Request)传给下载器
- 下载器把资源下载下来，并封装成应答包(Response)
- 爬虫解析Response
- 解析出实体（Item）,则交给实体管道进行进一步的处理
- 解析出的是链接（URL）,则把URL交给调度器等待抓取
三、基本使用
1.使用流程
1.创建项目scrapy startproject 项目名称 - 在当前目录中创建中创建一个项目文件（类似于Django）
2.创建爬虫应用
scrapy genspider 爬虫名字 主页 - 创建爬虫应用例如：
scrapy gensipider -t basic oldboy oldboy.com scrapy gensipider -t xmlfeed autohome autohome.com.cn 查看所有命令：scrapy gensipider -l 查看模板命令：scrapy gensipider -d 模板名称3，用pycharm打开项目目录
会创建很多文件文件说明：
- scrapy.cfg 项目的主配置信息。（真正爬虫相关的配置信息在settings.py文件中）
- items.py 设置数据存储模板，用于结构化数据，如：Django的Model
- pipelines 数据处理行为，如：一般结构化的数据持久化
- settings.py 配置文件，如：递归的层数、并发数，延迟下载等
- spiders 爬虫模板目录，如：创建文件，编写爬虫规则
3.查看爬虫应用列表
scrapy list4.配置
settings.py中设置DEPTH_LIMIT = 1来指定“递归”的层数。
4.运行爬虫应用
scrapy crawl 爬虫应用名称 --nolog#不加日志
2.程序实例
#打开spiders/应用
#一般创建爬虫文件时，以网站域名命名
import scrapyclass XiaoHuarSpider(scrapy.spiders.Spider): name = "xiaohuar" # 爬虫名称 ***** allowed_domains = ["xiaohuar.com"] # 允许的域名 start_urls = [ "http://www.xiaohuar.com/hua/", # 其实URL ] def parse(self, response): # 访问起始URL并获取结果后的回调函数
3.小试牛刀
import scrapyfrom scrapy.selector import HtmlXPathSelectorfrom scrapy.http.request import Request class DigSpider(scrapy.Spider): # 爬虫应用的名称，通过此名称启动爬虫命令 name = "dig" # 允许的域名 allowed_domains = ["chouti.com"] # 起始URL start_urls = [ ‘http://dig.chouti.com/‘, ] has_request_set = {} def parse(self, response): print(response.url) hxs = HtmlXPathSelector(response) page_list = hxs.select(‘//div[@id="dig_lcpage"]//a[re:test(@href, "/all/hot/recent/\d+")]/@href‘).extract() for page in page_list: page_url = ‘http://dig.chouti.com%s‘ % page key = self.md5(page_url) if key in self.has_request_set: pass else: self.has_request_set[key] = page_url obj = Request(url=page_url, method=‘GET‘, callback=self.parse) yield obj @staticmethod def md5(val): import hashlib ha = hashlib.md5() ha.update(bytes(val, encoding=‘utf-8‘)) key = ha.hexdigest() return key
#重写start请求函数制定处理函数def start_requests(self): for url in self.start_urls: yield Request(url,callback=self.next)def next(self): pass
总结：
- Request是一个封装用户请求的类，在回调函数中yield该对象表示继续访问
- HtmlXpathSelector用于结构化HTML代码并提供选择器功能
三、 选择器（类似于标签选择器）
# -*- coding:utf-8 -*-from scrapy.selector import Selector, HtmlXPathSelectorfrom scrapy.http import HtmlResponsehtml = """<!DOCTYPE html><html> <head lang="en"> <meta charset="UTF-8"> <title></title> </head> <body> <ul> <li class="item-"><a id=‘i1‘ href=http://www.mamicode.com/"link.html">first item</a></li> <li class="item-0"><a id=‘i2‘ href=http://www.mamicode.com/"llink.html">first item</a></li> <li class="item-1"><a href=http://www.mamicode.com/"llink2.html">second item<span>vv</span></a></li> </ul> <div><a href=http://www.mamicode.com/"llink2.html">second item</a></div> </body></html>"""response = HtmlResponse(url=‘http://example.com‘, body=html,encoding=‘utf-8‘)# hxs = HtmlXPathSelector(response)# print(hxs)# hxs = Selector(response=response).xpath(‘//a‘)
找到所有a标签# print(hxs)# hxs = Selector(response=response).xpath(‘//a[2]‘)
找到a标签# print(hxs)# hxs = Selector(response=response).xpath(‘//a[@id]‘)
找到a标签有id的# print(hxs)# hxs = Selector(response=response).xpath(‘//a[@id="i1"]‘)
找到a标签切id=il的# print(hxs)# hxs = Selector(response=response).xpath(‘//a[@href="http://www.mamicode.com/link.html"][@id="i1"]‘)
找到a标签 href=http://www.mamicode.com/link.html 且 id =il
# print(hxs)
# hxs = Selector(response=response).xpath(‘//a[contains(@href, "link")]‘)
# print(hxs)
# hxs = Selector(response=response).xpath(‘//a[starts-with(@href, "link")]‘)
# print(hxs) #
hxs = Selector(response=response).xpath(‘//a[re:test(@id, "i\d+")]‘)
# print(hxs) # hxs = Selector(response=response).xpath(‘//a[re:test(@id, "i\d+")]/text()‘).extract()
# print(hxs)
# hxs = Selector(response=response).xpath(‘//a[re:test(@id, "i\d+")]/@href‘).extract()
# print(hxs)
# hxs = Selector(response=response).xpath(‘/html/body/ul/li/a/@href‘).extract()
# print(hxs)
# hxs = Selector(response=response).xpath(‘//body/ul/li/a/@href‘).extract_first()
# print(hxs)
# ul_list = Selector(response=response).xpath(‘//body/ul/li‘)
# for item in ul_list:
# v = item.xpath(‘./a/span‘) #
# 或 #
# v = item.xpath(‘a/span‘) #
# 或 #
# v = item.xpath(‘*/a/span‘)
# print(v)
# -*- coding: utf-8 -*-import scrapyfrom scrapy.selector import HtmlXPathSelectorfrom scrapy.http.request import Requestfrom scrapy.http.cookies import CookieJarfrom scrapy import FormRequestclass ChouTiSpider(scrapy.Spider): # 爬虫应用的名称，通过此名称启动爬虫命令 name = "chouti" # 允许的域名 allowed_domains = ["chouti.com"] cookie_dict = {} has_request_set = {} def start_requests(self): url = ‘http://dig.chouti.com/‘ # return [Request(url=url, callback=self.login)] yield Request(url=url, callback=self.login) def login(self, response): cookie_jar = CookieJar() cookie_jar.extract_cookies(response, response.request) for k, v in cookie_jar._cookies.items(): for i, j in v.items(): for m, n in j.items(): self.cookie_dict[m] = n.value req = Request( url=‘http://dig.chouti.com/login‘, method=‘POST‘, headers={‘Content-Type‘: ‘application/x-www-form-urlencoded; charset=UTF-8‘}, body=‘phone=8615131255089&password=pppppppp&oneMonth=1‘, cookies=self.cookie_dict, callback=self.check_login ) yield req def check_login(self, response): req = Request( url=‘http://dig.chouti.com/‘, method=‘GET‘, callback=self.show, cookies=self.cookie_dict, dont_filter=True ) yield req def show(self, response): # print(response) hxs = HtmlXPathSelector(response) news_list = hxs.select(‘//div[@id="content-list"]/div[@class="item"]‘) for new in news_list: # temp = new.xpath(‘div/div[@class="part2"]/@share-linkid‘).extract() link_id = new.xpath(‘*/div[@class="part2"]/@share-linkid‘).extract_first() yield Request( url=‘http://dig.chouti.com/link/vote?linksId=%s‘ %(link_id,), method=‘POST‘, cookies=self.cookie_dict, callback=self.do_favor ) page_list = hxs.select(‘//div[@id="dig_lcpage"]//a[re:test(@href, "/all/hot/recent/\d+")]/@href‘).extract() for page in page_list: page_url = ‘http://dig.chouti.com%s‘ % page import hashlib hash = hashlib.md5() hash.update(bytes(page_url,encoding=‘utf-8‘)) key = hash.hexdigest() if key in self.has_request_set: pass else: self.has_request_set[key] = page_url yield Request( url=page_url, method=‘GET‘, callback=self.show ) def do_favor(self, response): print(response.text)示例：自动登陆抽屉并点赞
-*- coding: utf-8 -*-import scrapyimport sys,iofrom scrapy.http import Requestfrom scrapy.selector import Selector, HtmlXPathSelectorfrom ..items import ChoutiItem# 用于定位标签sys.stdout=io.TextIOWrapper(sys.stdout.buffer,encoding=‘gb18030‘)from scrapy.http.cookies import CookieJarclass ChoutiSpider(scrapy.Spider): name = "chouti" allowed_domains = ["chouti.com"] # allowed_domains = ["chouti.com",baidu.com] 域名限制 start_urls = [‘http://dig.chouti.com/‘] cookie_dict=None def parse(self, response): cookie_obj=CookieJar() cookie_obj.extract_cookies(response,response.request) # response.request返回是访问对象 self.cookie_dict=cookie_obj._cookies # 带上用户名密码+cookie yield Request( url="http://dig.chouti.com/login", method=‘POST‘, body="phone=8618731008140&password=cuiyuetian1988&oneMonth=1", headers={‘Content-Type‘:‘application/x-www-form-urlencoded; charset=UTF-8‘}, cookies=cookie_obj._cookies, callback=self.check_login ) def check_login(self,response): ‘‘‘查看登录结果‘‘‘ print(response.text) yield Request(url=‘http://dig.chouti.com/‘,callback=self.like) def like(self,response): ‘‘‘点赞‘‘‘ id_list = Selector(response=response).xpath(‘//div[@share-linkid]/@share-linkid‘).extract() for nid in id_list: print(nid) url = "http://dig.chouti.com/link/vote?linksId=%s" % nid yield Request( url=url, method="POST", cookies=self.cookie_dict, callback=self.show ) page_urls=Selector(response=response).xpath(‘//div[@id="dig_lcpage"]//a/@href‘).extract() for page in page_urls: url = "http://dig.chouti.com%s" % page yield Request(url=url, callback=self.like) def show(self,response): print(response.text)
四、 格式化处理（items.py）
上述实例只是简单的处理，所以在parse方法中直接处理。如果对于想要获取更多的数据处理，则可以利用Scrapy的items将数据格式化，然后统一交由pipelines来处理。
# -*- coding: utf-8 -*-import scrapy,io,sysfrom scrapy.http import Requestfrom scrapy.selector import Selector, HtmlXPathSelector# sys.stdout=io.TextIOWrapper(sys.stdout.buffer,encoding=‘gb18030‘)from ..items import Xiaohuaclass XiaohuSpider(scrapy.Spider): name=‘xiaohua‘ allowed_domains = ["xiaohuar.com"] start_urls = [‘http://xiaohuar.com/hua/‘] vis=set() def parse(self, response): res=Selector(response=response).xpath(‘//div[@id="list_img"]//div[@class="item_t"]‘) for obj in res: src=obj.xpath(‘.//div[@class="img"]//img/@src‘).extract_first().strip() name=obj.xpath(‘.//div[@class="img"]/span/text()‘).extract_first().strip() src=‘http://xiaohuar.com%s‘%(src) item_obj=Xiaohua(src=http://www.mamicode.com/src,name=name) yield item_obj res2=Selector(response=response).xpath(‘//div[@id="page"]//a/@href‘) for url in res2: if not url: continue md_url = self.md5(url.extract()) if md_url in self.vis: pass else: self.vis.add(md_url) url = url.extract() print(url) yield Request(url=url,callback=self.parse) def md5(self,url): import hashlib obj=hashlib.md5() obj.update(bytes(url, encoding=‘utf-8‘)) return obj.hexdigest()
import scrapyclass Xiaohua(scrapy.Item): src=scrapy.Field() name=scrapy.Field()
import jsonimport osimport requestsclass Myxiaohua(object): def __init__(self): if not os.path.exists(‘imgs‘): os.makedirs(‘imgs‘) def process_item(self, item, spider): name="%s.jpg"%item[‘name‘] print(item[‘src‘]) res = requests.get(item[‘src‘], stream=True) res.encoding=‘utf-8‘ with open(os.path.join(‘imgs‘,name),‘wb‘) as f : f.write(res.content) return item
ITEM_PIPELINES = { ‘myscrapy1.pipelines.Myscrapy1Pipeline‘: 300, ‘myscrapy1.pipelines.Myxiaohua‘: 300,}#ITEM_PIPELINES = { # ‘spider1.pipelines.JsonPipeline‘: 100, #‘spider1.pipelines.FilePipeline‘: 300,#}# 每行后面的整型值，确定了他们运行的顺序，item按数字从低到高的顺序，通过pipeline，通常将这些数字定义在0-1000范围内。
五、自定制命令
- 在spiders同级创建任意目录，如：commands
- 在其中创建 crawlall.py 文件 （此处文件名就是自定义的命令）
- 待续。。。。
六、自定义扩展
自定义扩展时，利用信号在指定位置注册制定操作
extensionsEXTENSIONS = { # ‘scrapy.extensions.telnet.TelnetConsole‘: None,‘myscrapy1.extensions.MyExtend‘: 300,}
七、自定义避免重复访问
scrapy默认使用 scrapy.dupefilter.RFPDupeFilter 进行去重，相关配置有：
DUPEFILTER_CLASS = ‘scrapy.dupefilter.RFPDupeFilter‘DUPEFILTER_DEBUG = FalseJOBDIR = "保存范文记录的日志路径，如：/root/" # 最终路径为 /root/requests.seen
class RepeatUrl: def __init__(self): self.visited_url = set() @classmethod def from_settings(cls, settings): """ 初始化时，调用 :param settings: :return: """ return cls() def request_seen(self, request): """ 检测当前请求是否已经被访问过 :param request: :return: True表示已经访问过；False表示未访问过 """ if request.url in self.visited_url: return True self.visited_url.add(request.url) return False def open(self): """ 开始爬去请求时，调用 :return: """ print(‘open replication‘) def close(self, reason): """ 结束爬虫爬取时，调用 :param reason: :return: """ print(‘close replication‘) def log(self, request, spider): """ 记录日志 :param request: :param spider: :return: """ print(‘repeat‘, request.url)自定义URL去重操作
# from scrapy.dupefilters import RFPDupeFilterclass RepeatFilter(object): def __init__(self): self.visited_set=set() @classmethod def from_settings(cls, settings): return cls() def request_seen(self, request): if request.url in self.visited_set: return True self.visited_set.add(request.url) return False def open(self): # can return deferred print(‘start...‘) pass def close(self, reason): # can return a deferred print(‘close...‘) pass def log(self, request, spider): # log that a request has been filtered pass
DUPEFILTER_CLASS=‘myscrapy1.myduplication.RepeatFilter‘
八、其他
# -*- coding: utf-8 -*-# Scrapy settings for step8_king 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# 1. 爬虫名称BOT_NAME = ‘step8_king‘# 2. 爬虫应用路径SPIDER_MODULES = [‘step8_king.spiders‘]NEWSPIDER_MODULE = ‘step8_king.spiders‘# Crawl responsibly by identifying yourself (and your website) on the user-agent# 3. 客户端 user-agent请求头客户端 user-agent请求头会带着你的BOT_NAME# USER_AGENT = ‘step8_king (+http://www.yourdomain.com)‘# 可以进行伪装成浏览器USER_AGENT = ‘Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36‘# Obey robots.txt rules# 4. 禁止爬虫配置是否遵循反爬虫规则# ROBOTSTXT_OBEY = False# Configure maximum concurrent requests performed by Scrapy (default: 16)# 5. 并发请求数（根据反爬虫能力制定并发）# CONCURRENT_REQUESTS = 4# 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# 6. 延迟下载秒数# DOWNLOAD_DELAY = 2# The download delay setting will honor only one of:# 7. 单域名访问并发数，并且延迟下次秒数也应用在每个域名# CONCURRENT_REQUESTS_PER_DOMAIN = 2# 单IP访问并发数，如果有值则忽略：CONCURRENT_REQUESTS_PER_DOMAIN，并且延迟下次秒数也应用在每个IP# CONCURRENT_REQUESTS_PER_IP = 3# Disable cookies (enabled by default)# 8. 是否支持cookie，cookiejar进行操作cookie# COOKIES_ENABLED = True# COOKIES_DEBUG = True# Disable Telnet Console (enabled by default)# 9. Telnet用于查看当前爬虫的信息，操作爬虫等...# 使用telnet ip port ，然后通过命令操作# TELNETCONSOLE_ENABLED = True# TELNETCONSOLE_HOST = ‘127.0.0.1‘# TELNETCONSOLE_PORT = [6023,]# 10. 默认请求头# 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‘,# }# Configure item pipelines# See http://scrapy.readthedocs.org/en/latest/topics/item-pipeline.html# 11. 定义pipeline处理请求# ITEM_PIPELINES = {# ‘step8_king.pipelines.JsonPipeline‘: 700,# ‘step8_king.pipelines.FilePipeline‘: 500,# }# 12. 自定义扩展，基于信号进行调用# Enable or disable extensions# See http://scrapy.readthedocs.org/en/latest/topics/extensions.html# EXTENSIONS = {# # ‘step8_king.extensions.MyExtension‘: 500,# }# 13. 爬虫允许的最大深度，可以通过meta查看当前深度；0表示无深度# DEPTH_LIMIT = 3# 14. 爬取时，0表示深度优先Lifo(默认)；1表示广度优先FiFo# 后进先出，深度优先# DEPTH_PRIORITY = 0# SCHEDULER_DISK_QUEUE = ‘scrapy.squeue.PickleLifoDiskQueue‘# SCHEDULER_MEMORY_QUEUE = ‘scrapy.squeue.LifoMemoryQueue‘# 先进先出，广度优先# DEPTH_PRIORITY = 1# SCHEDULER_DISK_QUEUE = ‘scrapy.squeue.PickleFifoDiskQueue‘# SCHEDULER_MEMORY_QUEUE = ‘scrapy.squeue.FifoMemoryQueue‘# 15. 调度器队列# SCHEDULER = ‘scrapy.core.scheduler.Scheduler‘# from scrapy.core.scheduler import Scheduler# 16. 访问URL去重# DUPEFILTER_CLASS = ‘step8_king.duplication.RepeatUrl‘# Enable and configure the AutoThrottle extension (disabled by default)# See http://doc.scrapy.org/en/latest/topics/autothrottle.html"""17. 自动限速算法 from scrapy.contrib.throttle import AutoThrottle 自动限速设置 1. 获取最小延迟 DOWNLOAD_DELAY 2. 获取最大延迟 AUTOTHROTTLE_MAX_DELAY 3. 设置初始下载延迟 AUTOTHROTTLE_START_DELAY 4. 当请求下载完成后，获取其"连接"时间 latency，即：请求连接到接受到响应头之间的时间 5. 用于计算的... AUTOTHROTTLE_TARGET_CONCURRENCY target_delay = latency / self.target_concurrency new_delay = (slot.delay + target_delay) / 2.0 # 表示上一次的延迟时间 new_delay = max(target_delay, new_delay) new_delay = min(max(self.mindelay, new_delay), self.maxdelay) slot.delay = new_delay"""# 开始自动限速 帮我们# AUTOTHROTTLE_ENABLED = True# The initial download delay# 初始下载延迟# AUTOTHROTTLE_START_DELAY = 5# The maximum download delay to be set in case of high latencies# 最大下载延迟# AUTOTHROTTLE_MAX_DELAY = 10# The average number of requests Scrapy should be sending in parallel to each remote server# 平均每秒并发数# AUTOTHROTTLE_TARGET_CONCURRENCY = 1.0# Enable showing throttling stats for every response received:# 是否显示# AUTOTHROTTLE_DEBUG = True# Enable and configure HTTP caching (disabled by default)# See http://scrapy.readthedocs.org/en/latest/topics/downloader-middleware.html#httpcache-middleware-settings"""18. 启用缓存 目的用于将已经发送的请求或相应缓存下来，以便以后使用 from scrapy.downloadermiddlewares.httpcache import HttpCacheMiddleware from scrapy.extensions.httpcache import DummyPolicy from scrapy.extensions.httpcache import FilesystemCacheStorage"""# 是否启用缓存策略# HTTPCACHE_ENABLED = True# 缓存策略：所有请求均缓存，下次在请求直接访问原来的缓存即可# HTTPCACHE_POLICY = "scrapy.extensions.httpcache.DummyPolicy"# 缓存策略：根据Http响应头：Cache-Control、Last-Modified 等进行缓存的策略# HTTPCACHE_POLICY = "scrapy.extensions.httpcache.RFC2616Policy"# 缓存超时时间# HTTPCACHE_EXPIRATION_SECS = 0# 缓存保存路径# HTTPCACHE_DIR = ‘httpcache‘# 缓存忽略的Http状态码# HTTPCACHE_IGNORE_HTTP_CODES = []# 缓存存储的插件# HTTPCACHE_STORAGE = ‘scrapy.extensions.httpcache.FilesystemCacheStorage‘"""19. 代理，需要在环境变量中设置 from scrapy.contrib.downloadermiddleware.httpproxy import HttpProxyMiddleware 方式一：使用默认 os.environ { http_proxy:http://root:woshiniba@192.168.11.11:9999/ https_proxy:http://192.168.11.11:9999/ } 方式二：使用自定义下载中间件 def to_bytes(text, encoding=None, errors=‘strict‘): if isinstance(text, bytes): return text if not isinstance(text, six.string_types): raise TypeError(‘to_bytes must receive a unicode, str or bytes ‘ ‘object, got %s‘ % type(text).__name__) if encoding is None: encoding = ‘utf-8‘ return text.encode(encoding, errors) class ProxyMiddleware(object): def process_request(self, request, spider): PROXIES = [ {‘ip_port‘: ‘111.11.228.75:80‘, ‘user_pass‘: ‘‘}, {‘ip_port‘: ‘120.198.243.22:80‘, ‘user_pass‘: ‘‘}, {‘ip_port‘: ‘111.8.60.9:8123‘, ‘user_pass‘: ‘‘}, {‘ip_port‘: ‘101.71.27.120:80‘, ‘user_pass‘: ‘‘}, {‘ip_port‘: ‘122.96.59.104:80‘, ‘user_pass‘: ‘‘}, {‘ip_port‘: ‘122.224.249.122:8088‘, ‘user_pass‘: ‘‘}, ] proxy = random.choice(PROXIES) if proxy[‘user_pass‘] is not None: request.meta[‘proxy‘] = to_bytes（"http://%s" % proxy[‘ip_port‘]） encoded_user_pass = base64.encodestring(to_bytes(proxy[‘user_pass‘])) request.headers[‘Proxy-Authorization‘] = to_bytes(‘Basic ‘ + encoded_user_pass) print "**************ProxyMiddleware have pass************" + proxy[‘ip_port‘] else: print "**************ProxyMiddleware no pass************" + proxy[‘ip_port‘] request.meta[‘proxy‘] = to_bytes("http://%s" % proxy[‘ip_port‘]) DOWNLOADER_MIDDLEWARES = { ‘step8_king.middlewares.ProxyMiddleware‘: 500, } """"""20. Https访问 Https访问时有两种情况： 1. 要爬取网站使用的可信任证书(默认支持) DOWNLOADER_HTTPCLIENTFACTORY = "scrapy.core.downloader.webclient.ScrapyHTTPClientFactory" DOWNLOADER_CLIENTCONTEXTFACTORY = "scrapy.core.downloader.contextfactory.ScrapyClientContextFactory" 2. 要爬取网站使用的自定义证书 DOWNLOADER_HTTPCLIENTFACTORY = "scrapy.core.downloader.webclient.ScrapyHTTPClientFactory" DOWNLOADER_CLIENTCONTEXTFACTORY = "step8_king.https.MySSLFactory" # https.py from scrapy.core.downloader.contextfactory import ScrapyClientContextFactory from twisted.internet.ssl import (optionsForClientTLS, CertificateOptions, PrivateCertificate) class MySSLFactory(ScrapyClientContextFactory): def getCertificateOptions(self): from OpenSSL import crypto v1 = crypto.load_privatekey(crypto.FILETYPE_PEM, open(‘/Users/wupeiqi/client.key.unsecure‘, mode=‘r‘).read()) v2 = crypto.load_certificate(crypto.FILETYPE_PEM, open(‘/Users/wupeiqi/client.pem‘, mode=‘r‘).read()) return CertificateOptions( privateKey=v1, # pKey对象 certificate=v2, # X509对象 verify=False, method=getattr(self, ‘method‘, getattr(self, ‘_ssl_method‘, None)) ) 其他： 相关类 scrapy.core.downloader.handlers.http.HttpDownloadHandler scrapy.core.downloader.webclient.ScrapyHTTPClientFactory scrapy.core.downloader.contextfactory.ScrapyClientContextFactory 相关配置 DOWNLOADER_HTTPCLIENTFACTORY DOWNLOADER_CLIENTCONTEXTFACTORY""""""21. 爬虫中间件 class SpiderMiddleware(object): def process_spider_input(self,response, spider): ‘‘‘ 下载完成，执行，然后交给parse处理 :param response: :param spider: :return: ‘‘‘ pass def process_spider_output(self,response, result, spider): ‘‘‘ spider处理完成，返回时调用 :param response: :param result: :param spider: :return: 必须返回包含 Request 或 Item 对象的可迭代对象(iterable) ‘‘‘ return result def process_spider_exception(self,response, exception, spider): ‘‘‘ 异常调用 :param response: :param exception: :param spider: :return: None,继续交给后续中间件处理异常；含 Response 或 Item 的可迭代对象(iterable)，交给调度器或pipeline ‘‘‘ return None def process_start_requests(self,start_requests, spider): ‘‘‘ 爬虫启动时调用 :param start_requests: :param spider: :return: 包含 Request 对象的可迭代对象 ‘‘‘ return start_requests 内置爬虫中间件： ‘scrapy.contrib.spidermiddleware.httperror.HttpErrorMiddleware‘: 50, ‘scrapy.contrib.spidermiddleware.offsite.OffsiteMiddleware‘: 500, ‘scrapy.contrib.spidermiddleware.referer.RefererMiddleware‘: 700, ‘scrapy.contrib.spidermiddleware.urllength.UrlLengthMiddleware‘: 800, ‘scrapy.contrib.spidermiddleware.depth.DepthMiddleware‘: 900,"""# from scrapy.contrib.spidermiddleware.referer import RefererMiddleware# Enable or disable spider middlewares# See http://scrapy.readthedocs.org/en/latest/topics/spider-middleware.htmlSPIDER_MIDDLEWARES = { # ‘step8_king.middlewares.SpiderMiddleware‘: 543,}"""22. 下载中间件 class DownMiddleware1(object): def process_request(self, request, spider): ‘‘‘ 请求需要被下载时，经过所有下载器中间件的process_request调用 :param request: :param spider: :return: None,继续后续中间件去下载； Response对象，停止process_request的执行，开始执行process_response Request对象，停止中间件的执行，将Request重新调度器 raise IgnoreRequest异常，停止process_request的执行，开始执行process_exception ‘‘‘ pass def process_response(self, request, response, spider): ‘‘‘ spider处理完成，返回时调用 :param response: :param result: :param spider: :return: Response 对象：转交给其他中间件process_response Request 对象：停止中间件，request会被重新调度下载 raise IgnoreRequest 异常：调用Request.errback ‘‘‘ print(‘response1‘) return response def process_exception(self, request, exception, spider): ‘‘‘ 当下载处理器(download handler)或 process_request() (下载中间件)抛出异常 :param response: :param exception: :param spider: :return: None：继续交给后续中间件处理异常； Response对象：停止后续process_exception方法 Request对象：停止中间件，request将会被重新调用下载 ‘‘‘ return None 默认下载中间件 { ‘scrapy.contrib.downloadermiddleware.robotstxt.RobotsTxtMiddleware‘: 100, ‘scrapy.contrib.downloadermiddleware.httpauth.HttpAuthMiddleware‘: 300, ‘scrapy.contrib.downloadermiddleware.downloadtimeout.DownloadTimeoutMiddleware‘: 350, ‘scrapy.contrib.downloadermiddleware.useragent.UserAgentMiddleware‘: 400, ‘scrapy.contrib.downloadermiddleware.retry.RetryMiddleware‘: 500, ‘scrapy.contrib.downloadermiddleware.defaultheaders.DefaultHeadersMiddleware‘: 550, ‘scrapy.contrib.downloadermiddleware.redirect.MetaRefreshMiddleware‘: 580, ‘scrapy.contrib.downloadermiddleware.httpcompression.HttpCompressionMiddleware‘: 590, ‘scrapy.contrib.downloadermiddleware.redirect.RedirectMiddleware‘: 600, ‘scrapy.contrib.downloadermiddleware.cookies.CookiesMiddleware‘: 700, ‘scrapy.contrib.downloadermiddleware.httpproxy.HttpProxyMiddleware‘: 750, ‘scrapy.contrib.downloadermiddleware.chunked.ChunkedTransferMiddleware‘: 830, ‘scrapy.contrib.downloadermiddleware.stats.DownloaderStats‘: 850, ‘scrapy.contrib.downloadermiddleware.httpcache.HttpCacheMiddleware‘: 900, }"""# from scrapy.contrib.downloadermiddleware.httpauth import HttpAuthMiddleware# Enable or disable downloader middlewares# See http://scrapy.readthedocs.org/en/latest/topics/downloader-middleware.html# DOWNLOADER_MIDDLEWARES = {# ‘step8_king.middlewares.DownMiddleware1‘: 100,# ‘step8_king.middlewares.DownMiddleware2‘: 500,# }settings
Scrapy
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