scrapy框架基本设置

个人记录帖，方便于后面的代码运行，

首先是scrapy中的setting.py

# -*- coding: utf-8 -*-

# Scrapy settings for mjx_project 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 = 'mjx_project'

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


# Crawl responsibly by identifying yourself (and your website) on the user-agent
#USER_AGENT = 'mjx_project (+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://doc.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://doc.scrapy.org/en/latest/topics/spider-middleware.html
#SPIDER_MIDDLEWARES = {
#    'mjx_project.middlewares.MjxProjectSpiderMiddleware': 543,
#}

# Enable or disable downloader middlewares
# See https://doc.scrapy.org/en/latest/topics/downloader-middleware.html
DOWNLOADER_MIDDLEWARES = {
   'mjx_project.middlewares.MjxProjectDownloaderMiddleware': 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
ITEM_PIPELINES = {
   # 'mjx_project.pipelines.XcxPipeline': 1,
   # 'mjx_project.pipelines.MysqlProjectPipeline': 300,
    'mjx_project.pipelines.TuchongProjectPipeline': 300,
}

# 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'

ITEM_PIPELINES中

# 'mjx_project.pipelines.MysqlProjectPipeline': 300,是专门用来各种存储数据

'mjx_project.pipelines.TuchongProjectPipeline': 300,是爬取图虫的管道

存入mysql数据对象化建于项目下的mysqlhelper.py

import pymysql

class MysqlHelper(object):
    def __init__(self):

        self.db = pymysql.connect(host='127.0.0.1',port=3306,user='root',password='123456',database='sprider',charset='utf8')
        self.cursor = self.db.cursor()

    def execute_modify_sql(self,sql,data = None):

        self.cursor.execute(sql,data)

        self.db.commit()

    def __del__(self):

        self.cursor.close()

        self.db.close()

if __name__ == '__main__':
    
    #用于测试sql语句
    sql = 'insert into tc_test(title,room,dizhi,price) values (%s,%s,%s,%s)'
    data = ('mjx','mjx','mjx','mjx')

    myhelper = MysqlHelper()
    myhelper.execute_modify_sql(sql,data)

middleware.py中加入通用请求头

    def process_request(self, request, spider):
        request.headers['user-agent'] = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36'

基本配置成功！下篇文章开始爬取

scrapy框架基本设置

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