1。安装SCRAPY
2。进入CMD：执行：SCRAPY显示：
Scrapy 1.8.0 - no active project
Usage:
scrapy <command> [options] [args]
Available commands:
bench Run quick benchmark test
fetch Fetch a URL using the Scrapy downloader
genspider Generate new spider using pre-defined templates
runspider Run a self-contained spider (without creating a project)
settings Get settings values
shell Interactive scraping console
startproject Create new project
version Print Scrapy version
view Open URL in browser, as seen by Scrapy
[ more ] More commands available when run from project directory
Use "scrapy <command> -h" to see more info about a command
出现上面的内容则表示SCRAPY安装成功
3。建立放置爬虫的文件夹d:\crapy
4.进入d:\crapy
d:\crapy>
5.建立爬虫项目：scrapy startproject cnblog
New Scrapy project 'cnblog', using template directory 'd:\python\python37\lib\site-packages\scrapy\templates\project', created in:
D:\crapy\cnblog
You can start your first spider with:
cd cnblog
scrapy genspider example example.com
上面的提示表示建立了一个名称叫cnblog的爬虫项目，指明了项目应用的模板及位置：即当前位置下建立了一个与项目同名的文件夹；要想开始爬虫必须进入新建立的文件夹（cnblog)来建立爬虫
6。建立第一个爬虫
D:\crapy>cd cnblog
D:\crapy\cnblog>scrapy genspider cnblog cnblogs.com #指定爬虫名称为cnblogs时出错，提示不能与当前项目同名
Cannot create a spider with the same name as your project
D:\crapy\cnblog>scrapy genspider cnbloga cnblogs.com
Created spider 'cnbloga' using template 'basic' in module
cnblog.spiders.cnbloga
#建立了第一个爬虫名称为“cnbloga",爬取的DOMAIN为“cnblogs.com",只爬取域名内的信息，这是爬取范围限定；并且指定的应用模板为“basic"
7。打开相应的爬虫文件：d:\crapy\cnblog\cnblog\spider\cnbloga.py
# -*- coding: utf-8 -*-
import scrapy
class CnblogaSpider(scrapy.Spider):
name = 'cnbloga'
allowed_domains = ['cnblogs.com']
start_urls = ['']
def parse(self, response):
pass第一行引用爬虫；声明一个类：Cnblogaspider,继承于scrapy.Spider;爬虫的名称“ cnbloga";爬取的范围'cnblogs.com';开始爬取的网址为;
默认方法parse,即每得到相应的网址，就交给这个方法来处理；
8。运行爬虫：
d:\crapy\cnblog>scrapy crawl cnbloga#‘cnbloga'为相应的爬虫的名称
