网站简介 更改,phpcms做企业网站授权,微网站用什么做的,wordpress转成hexoscrapy的安装
不得姐网站 直接用命令 pip install scrapy 网络可能较慢#xff0c;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#xff0c;白忙活了一天#xff0c;一直都是报错状态 pip install pypiwin32 scrapy的使用
cd到卓面或者其他…scrapy的安装
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www3、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 scrapy
from scrapy.http.response.html import HtmlResponse
from scrapy.selector.unified import SelectorListclass BdjSpiderSpider(scrapy.Spider):name bdj_spiderallowed_domains [budejie.com]start_urls [http://budejie.com/]def parse(self, response):print(*100)print(*100)print(*100)words response.xpath(//div[classj-list-user]/div)for word in words:authorword.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 scrapy
from scrapy.http.response.html import HtmlResponse
from scrapy.selector.unified import SelectorListclass BdjSpiderSpider(scrapy.Spider):name bdj_spiderallowed_domains [budejie.com]start_urls [http://budejie.com/]def parse(self, response):print(*100)print(*100)print(*100)words response.xpath(//div[classj-r-list-c]/div)for word in words:authorword.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
#
# Dont forget to add your pipeline to the ITEM_PIPELINES setting
# See: https://docs.scrapy.org/en/latest/topics/item-pipeline.html
import jsonclass BdjPipeline(object):def __init__(self):self.fp open(duanzi.json,w,encodingutf-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_asciiFalse)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 bdjSPIDER_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 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 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/xhtmlxml,application/xml;q0.9,*/*;q0.8,
# 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.html
ITEM_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
