# -*- coding: utf-8 -*-
# Define here the models for your spider middleware
# # See documentation in:
from newrecord.settings import NOW_Y, NOW_M, NOW_D, YES_Y, YES_M, YES_D
from scrapy import signals
import time
import base64 # DownloadMiddleware # 0 47 167 宝蓝色RGB
# 在process_request downloadmiddleware 中添加代理
# proxy_user_pass = 'USERNAME:PASSWORD'
# encoded_user_pass = base64.b64encode(proxy_user_pass)
# request.headers['Proxy-Authorization']='Basic'+encoded_user_passwd
# request.meta['proxy']='IP:PORT'
class NewrecordSpiderMiddleware(object):
# Not all methods need to be defined. If a method is not defined,
# scrapy acts as if the spider middleware does not modify the
# passed objects.
@classmethod
def from_crawler(cls, crawler):
# This method is used by Scrapy to create your spiders.
s = cls()
crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
return s
# 进入spider 的response 的数据
# 和 downloadmiddle里面的process_response类似
# 先去downloadmiddleware那里的process_response 再到这里处理:
def process_spider_input(self, response, spider): # 处理进入spider中的response数据，但返回的是None
print('-----------------------3--------------------') # 对response筛选之后不能阻止进入spider 啥用？try--except---Exception,
print('---进入spidermiddleware----process_spider_input------response.url----%s--------'%(response.url))
# Called for each response that goes through the spider
try:
# middleware and into the spider.
# Should return None or raise an exception.
return None
except Exception as e:
print(e)
def process_spider_output(self, response, result, spider):
# Called with the results returned from the Spider, after
# it has processed the response.
# Must return an iterable of Request, dict or Item objects.
# result :经过parse_item 处理过后的输出结果，等于item数据也可以在这里处理，不过是在Pipline处理过后的数据
# parse_item 输出的结果先进入pipeline管道里去处理item数据最后回到process_spider_output这里，再就是关闭spider:
for i in result:
yield i
def process_spider_exception(self, response, exception, spider):
# Called when a spider or process_spider_input() method
# (from other spider middleware) raises an exception.
# Should return either None or an iterable of Response, dict
# or Item objects.
pass
# 处理start_urls 后面的url无关: 否则这方法不会运行，只能是start_urls参数
# 并且def 里面的东西只能是process_start_requests
# 处理start_urls 与后面的url无关:
def process_start_requests(self, start_urls, spider):
# Called with the start requests of the spider, and works # similarly to the process_spider_output() method, except
# that it doesn’t have a response associated.
# Must return only start_urls (not items).
for r in start_urls:
if str(r).find('rank_news') >= 0:
print('---------------------0-----------------------------')
print('-------------------进入Spider MiddleWare里面的开始爬去网页url-----------start_requests===:%s', r)
yield r
def spider_opened(self, spider):
spider.logger.info('Spider opened: %s ' %spider.name)
class NewrecordDownloaderMiddleware(object):
# Not all methods need to be defined. If a method is not defined,
# scrapy acts as if the downloader middleware does not modify the
# passed objects.
@classmethod
def from_crawler(cls, crawler):
crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
return s
# Proxy-Authorization base64代理账户验证
# request.meta['proxy'] = "http://YOUR_PROXY_IP:PORT"
# encoded_user_pass = base64.b64encode(proxy_user_pass)
# request.headers['Proxy-Authorization'] = 'Basic ' + encoded_user_pass
# request.meta['proxy'] = ['127.0.0.1:8000']
# request.meta['item']='' 在request meta 数据里面增加数据 可以用来传参
# request(url, meta['item']=item[], callback= '')
# request.cookies['']='' 往request里面增加cookies
def process_request(self, request, spider):
print('---------------1------------------')
print('----------------进入DownloadMiddleWare中的request的url是：%s----------------' %(request.url))
return None
# return None: continue processing this exception
# return a Response object: stops process_exception() chain
# return a Request object: stops process_exception() chain
def process_response(self, request, response, spider): # 处理所有爬过的网站的response,通过response.url 可以筛选
print('-----------------------------2---------------------------------') # 需要的爬取的网址，但这个在Rules里面更方便
print('----------------进入DownloadMiddleWare中的response的url是：%s----------------' %(response.url))
return response # 返回的response 进入spider 中的process_spider_input
def process_exception(self, request, exception, spider):
pass
def spider_opened(self, spider):
spider.logger.info('Spider opened: %s' % spider.name)
121 1,19 顶端