settings文件配置

1.USER_AGENT设置

2.延时【延迟是随机的（框架里面有计数方式）】
DOWNLOAD_DELAY = 2

3. 项目管道设置
   ITEM_PIPELINES = {
   'carhome.pipelines.CarhomePipeline': 300,
   'scrapy_redis.pipelines.RedisPipeline': 400,
   }

4.#连接redis数据库
REDIS_HOST = '192.168.13.20' #主机名
REDIS_PORT = 6379 #端口号
REDIS_PARAMS = {‘password’: ‘888’,} # 密码没有的不设置

5.#去重组件
DUPEFILTER_CLASS = "scrapy_redis.dupefilter.RFPDupeFilter"

6.#调度器组件设置
SCHEDULER = "scrapy_redis.scheduler.Scheduler"

7.# 持续化存储设置
SCHEDULER_PERSIST = True

8.# Log 设置
LOG_LEVEL = 'DEBUG'

9.编码设置
REDIS_ENCODING = "utf-8" # redis 编码类型默认：'utf-8'

  '''项目中的设置文件'''
    # -*- coding: utf-8 -*-
    
    # Scrapy settings for carhome 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.html
    
    BOT_NAME = 'carhome'
    
    SPIDER_MODULES = ['carhome.spiders']
    NEWSPIDER_MODULE = 'carhome.spiders'
    
    
    # Crawl responsibly by identifying yourself (and your website) on the user-agent
    USER_AGENT = 'carhome (+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 https://doc.scrapy.org/en/latest/topics/settings.html#download-delay
    # See also autothrottle settings and docs
    #延迟是随机的（框架里面有计数方式）
    DOWNLOAD_DELAY = 2
    # 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 = {
    #    'carhome.middlewares.CarhomeSpiderMiddleware': 543,
    #}
    
    # Enable or disable downloader middlewares
    # See https://doc.scrapy.org/en/latest/topics/downloader-middleware.html
    #DOWNLOADER_MIDDLEWARES = {
    #    'carhome.middlewares.CarhomeDownloaderMiddleware': 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
    #项目管道
    ITEM_PIPELINES = {
        'carhome.pipelines.CarhomePipeline': 300,
        'scrapy_redis.pipelines.RedisPipeline': 400,
    
    }
    
    # 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'
    
    #连接redis数据库
    REDIS_HOST = '192.168.13.20' #主机名
    REDIS_PORT = 6379 #端口号
    # REDIS_PARAMS = {
    # ‘password’: ‘123’,
    # }
    
    #去重组件
    DUPEFILTER_CLASS = "scrapy_redis.dupefilter.RFPDupeFilter"
    
    #调度器组件设置
    SCHEDULER = "scrapy_redis.scheduler.Scheduler"
    
    # 持续化存储设置
    SCHEDULER_PERSIST = True
    
    # Log 设置
    LOG_LEVEL = 'DEBUG'
    
    REDIS_ENCODING = "utf-8" # redis 编码类型默认：'utf-8'