爬虫_scrapy_日志信息以及日志等级

（1）日志级别

　　CRITICAL：严重错误

　　ERROR：一般错误

　　WARNING：警告

　　INFO：一般信息

　　DEBUG：调试信息

　　默认的日志等级是DEBUG

　　只要出现了DEBUG或者DEBUG以上等级的日志

　　那么这些日志将会打印

（2）settings.py文件设置

　　默认的级别为DEBUG，会显示上面所有的信息

　　在配置文件中settings.py

　　LOG_FILE：将屏幕显示的信息全部记录到文件中，屏幕不再显示，注意文件后缀一定是.log

　　LOG_LEVEL：设置日志显示的等级，就是显示哪些，不显示哪些。

# Scrapy settings for scrapy_readbook project
#
# For simplicity, this file contains only settings considered important or
# commonly used. You can find more settings consulting the documentation:
#
#     https://docs.scrapy.org/en/latest/topics/settings.html
#     https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
#     https://docs.scrapy.org/en/latest/topics/spider-middleware.html

BOT_NAME = 'scrapy_readbook'

SPIDER_MODULES = ['scrapy_readbook.spiders']
NEWSPIDER_MODULE = 'scrapy_readbook.spiders'


# Crawl responsibly by identifying yourself (and your website) on the user-agent
#USER_AGENT = 'scrapy_readbook (+http://www.yourdomain.com)'

# Obey robots.txt rules
ROBOTSTXT_OBEY = True
# 指定日志的级别
# LOG_LEVEL='WARNING'
# 配置文件日志地址
LOG_FILE='logdemo.log'

# 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://docs.scrapy.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 https://docs.scrapy.org/en/latest/topics/spider-middleware.html
#SPIDER_MIDDLEWARES = {
#    'scrapy_readbook.middlewares.ScrapyReadbookSpiderMiddleware': 543,
#}

# Enable or disable downloader middlewares
# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
#DOWNLOADER_MIDDLEWARES = {
#    'scrapy_readbook.middlewares.ScrapyReadbookDownloaderMiddleware': 543,
#}

# Enable or disable extensions
# See https://docs.scrapy.org/en/latest/topics/extensions.html
#EXTENSIONS = {
#    'scrapy.extensions.telnet.TelnetConsole': None,
#}

#配置数据库,名称一定要大写
DB_HOST = '127.0.0.1'
DB_PORT = 3306
DB_USER = 'sa'
DB_PASSWORD = 'HRBJYKJ-Battery'
DB_NAME = 'spider01'
# utf-8的“-”杠不允许写，否则就报错
DB_CHARSET = 'utf8'

# Configure item pipelines
# See https://docs.scrapy.org/en/latest/topics/item-pipeline.html
ITEM_PIPELINES = {
   'scrapy_readbook.pipelines.ScrapyReadbookPipeline': 300,
   'scrapy_readbook.pipelines.MysqlPipeline': 301
}

# Enable and configure the AutoThrottle extension (disabled by default)
# See https://docs.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://docs.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'