不得姐网站 直接用命令
pip install scrapy
网络可能较慢，等等就好 另外windows环境下你还需要安装win32 我之前就是因为没有安装这个库，白忙活了一天，一直都是报错状态
pip install pypiwin32
scrapy的使用cd到卓面或者其他看的到的文件夹 一行一行输入命令即可
1、scrapy startproject qsbk2、scrapy genspider bdj_spider budejie.com3、scrapy crawl bdj_spider解释1、scrapy startproject 项目名2、scrapy genspider 爬虫名 网址（不加www）3、爬虫名修改爬虫里面的parse函数，改为自己想要的效果即可以上为例 bdj_spider.py是最重要的文件，在里面修改parse即可获得自己想要的
这是获取百思不得姐第一页用户名的代码
# -*- coding: utf-8 -*-import scrapyfrom scrapy.http.response.html import HtmlResponsefrom scrapy.selector.unified import SelectorListclass BdjSpiderSpider(scrapy.Spider):name = 'bdj_spider'allowed_domains = ['budejie.com']start_urls = ['http://budejie.com/']def parse(self, response):print('='*100)print('='*100)print('='*100)words = response.xpath("//div[@class='j-list-user']/div")for word in words:author=word.xpath(".//a/text()").get()print(author)print('='*100)print('='*100)print('='*100)print('='*100)加等号的目的是更容易看出筛选的内容
进阶将爬取的文件存储在文件夹里 我遇到个巨大的坑。浪费我好长时间，都怪自己当时教程没看明白，反反复复的找错
需要在上文修改的文件
1、 bdj_spider.py
# -*- coding: utf-8 -*-import scrapyfrom scrapy.http.response.html import HtmlResponsefrom scrapy.selector.unified import SelectorListclass BdjSpiderSpider(scrapy.Spider):name = 'bdj_spider'allowed_domains = ['budejie.com']start_urls = ['http://budejie.com/']def parse(self, response):print('='*100)print('='*100)print('='*100)words = response.xpath("//div[@class='j-r-list-c']/div")for word in words:author=word.xpath(".//a/text()").get()author="".join(author).strip()duanzi = {"author":author}print(duanzi)yield duanzi切记这个yield后面必须有返回的值还必须有缩进一定要是for下面的，否则下面的process_item函数根本不会调用 setting里面改了也没有用
2、 pipelines.py
# -*- coding: utf-8 -*-# Define your item pipelines here## Don't forget to add your pipeline to the ITEM_PIPELINES setting# See: https://docs.scrapy.org/en/latest/topics/item-pipeline.htmlimport jsonclass BdjPipeline(object):def __init__(self):self.fp = open("duanzi.json","w",encoding='utf-8')self.fp.write("Hello")def open_spider(self,spider):print('爬虫开始了哈哈哈哈。。。。。')def process_item(self,item,spider):item_json = json.dumps(item,ensure_ascii=False)print("###"*100)print(item_json)self.fp.write(item_json+'\n')return itemdef close_spider(self,spider):self.fp.close()print('爬虫结束了哈哈哈哈。。。。。')3、 settings.py 把这个解开注释即可，或者复制以下代码覆盖文件
# -*- coding: utf-8 -*-# Scrapy settings for bdj 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.htmlBOT_NAME = 'bdj'SPIDER_MODULES = ['bdj.spiders']NEWSPIDER_MODULE = 'bdj.spiders'# Crawl responsibly by identifying yourself (and your website) on the user-agent#USER_AGENT = 'bdj (+http://www.yourdomain.com)'# Obey robots.txt rulesROBOTSTXT_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 = 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 = {# 'bdj.middlewares.BdjSpiderMiddleware': 543,#}# Enable or disable downloader middlewares# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html#DOWNLOADER_MIDDLEWARES = {# 'bdj.middlewares.BdjDownloaderMiddleware': 543,#}# 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.htmlITEM_PIPELINES = {'bdj.pipelines.BdjPipeline': 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 = 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'那么看看爬到的数据吧 成功
