爬虫问题

来源：7-8 职位信息入库-2

潇歌

2020-12-09

1.老师，请问是不是 item_loader.add_xpath 这个方法是得不到数据的，拉钩网工作地址，经验，工作类型等等，只要用到xpath就是得不到数据，试了好几次都没获取到，只能换成css选择器才行

2.爬虫启动后，只爬取了两个数据，就302重定向了，settings里面已经设置

DOWNLOAD_DELAY = 10

COOKIES_ENABLED = True
COOKIES_DEBUG = True

还是不行，应该怎么解决

写回答

2回答

潇歌

提问者

2020-12-12

import os

BOT_NAME = 'ArticleSpider'

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


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

# Obey robots.txt rules
ROBOTSTXT_OBEY = False

# 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 = 10
# The download delay setting will honor only one of:
#CONCURRENT_REQUESTS_PER_DOMAIN = 16
#CONCURRENT_REQUESTS_PER_IP = 16

USER_AGENT = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.183 Safari/537.36"

# Disable cookies (enabled by default)
COOKIES_ENABLED = True
COOKIES_DEBUG = True

# 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 = {
#    'ArticleSpider.middlewares.ArticlespiderSpiderMiddleware': 543,
#}

# Enable or disable downloader middlewares
# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
DOWNLOADER_MIDDLEWARES = {
   # 'ArticleSpider.middlewares.ArticlespiderDownloaderMiddleware': 543,
   'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware': 2,
}

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

# Configure item pipelines
# See https://docs.scrapy.org/en/latest/topics/item-pipeline.html
ITEM_PIPELINES = {
   # 'ArticleSpider.pipelines.ArticleImagePipeline': 1,
   # 'ArticleSpider.pipelines.JsonWithEncodingPipeline': 2,
   # 'ArticleSpider.pipelines.JsonExporterPipeline': 3,
   # 'ArticleSpider.pipelines.MysqlPieline': 4,
   'ArticleSpider.pipelines.MysqlTwistedPipeline': 5,
   'ArticleSpider.pipelines.ArticlespiderPipeline': 300

}
# 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 = 10
# 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'

IMAGES_URLS_FIELD = "front_image_url"
project_dir = os.path.dirname(os.path.abspath(__file__))
print(project_dir)
IMAGES_STORE = os.path.join(project_dir, 'images')

MYSQL_HOST = "127.0.0.1"
MYSQL_DBNAME = "article_spider"
MYSQL_USER = "root"
MYSQL_PASSWORD = "root"

SQL_DATETIME_FORMAT = "%Y-%m-%d %H:%M:%S"
SQL_DATE_FORMAT = "%Y-%m-%d"