Scrapy爬虫,华为商城商品数据爬虫demo

2020-11-25 11:01:48 浏览数 (1)

来自于华为云开发者大会,使用Python爬虫抓取图片和文字实验,应用Scrapy框架进行数据抓取,保存应用了mysql数据库,实验采用的是线上服务器,而这里照抄全是本地进行,如有不同,那肯定是本渣渣瞎改了!

  • step1.配置环境

1.新建文件夹 huawei

2.命令行配置python虚拟环境

代码语言:javascript复制
python -m venv ven

3.安装Scrapy框架

win7 64位系统下安装Scrapy框架 “pip install scrapy”,需要先安装相关环境,不然会报错,比如Twisted-,请自行对照python版本安装,本渣渣用的python3.8的所以下载的是Twisted-20.3.0-cp38-cp38-win_amd64.whl,没错,本渣渣是本地安装的方法安装的!

详细安装 win 安装Scrapy框架方法,推荐善用搜索引擎!

  • step2.创建Scrapy项目

同样的命令行操作

1.需要进入到指定目录,激活虚拟环境

代码语言:javascript复制
cd huawei
envScriptsactivate.bat

2.cmd命令行,新建Scrapy项目

代码语言:javascript复制
scrapy startproject vmall_spider
代码语言:javascript复制
cd vmall_spider
代码语言:javascript复制
scrapy genspider -t crawl vmall "vmall.com"
  • step3.关键源码

1.vmall.py(核心爬取代码)

代码语言:javascript复制
import scrapy
from scrapy.linkextractors import LinkExtractor
from scrapy.spiders import CrawlSpider, Rule
from vmall_spider.items import VmallSpiderItem

class VamllSpider(CrawlSpider):    
 name = 'vmall'    
 allowed_domains = ['vmall.com']    
 start_urls = ['https://www.vmall.com/']    
 rules = (        
  Rule(LinkExtractor(allow=r'.*/product/.*'), callback='parse_item', follow=True),    
  )   

 def parse_item(self, response):
  title=response.xpath("//div[@class='product-meta']/h1/text()").get()     
  image=response.xpath("//a[@id='product-img']/img/@src").get()        
  item=VmallSpiderItem(
   title=title,
   image=image,
  )
  print("="*30)        
  print(title)
  print(image)        
  print("="*30)        
  yield item
    

2.items.py

代码语言:javascript复制
import scrapy


class VmallSpiderItem(scrapy.Item):
    title=scrapy.Field()
    image=scrapy.Field()
    

3.pipelines.py

数据存储处理

代码语言:javascript复制

import pymysql
import os
from urllib import request


class VmallSpiderPipeline:    
 def __init__(self):        
  dbparams={
      'host':'127.0.0.1', #云数据库弹性公网IP
      'port':3306, #云数据库端口            
      'user':'vmall', #云数据库用户
      'password':'123456', #云数据库RDS密码
      'database':'vmall', #数据库名称            
      'charset':'utf8'        
  }        
  self.conn=pymysql.connect(**dbparams)        
  self.cursor=self.conn.cursor()        
  self._sql=None

  self.path=os.path.join(os.path.dirname(os.path.dirname(__file__)),'images')        
  if not os.path.exists(self.path):            
   os.mkdir(self.path)    


 def process_item(self,item,spider):        
  url=item['image']        
  image_name=url.split('_')[-1]        
  print("--------------------------image_name-----------------------------")        
  print(image_name)        
  print(url)        
  request.urlretrieve(url,os.path.join(self.path,image_name))        
  self.cursor.execute(self.sql,(item['title'], item['image']))        
  self.conn.commit()        
  return item  
    

3.settings.py

更改的部分代码

代码语言:javascript复制
BOT_NAME = 'vmall_spider'

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

ROBOTSTXT_OBEY = False

DOWNLOAD_DELAY = 3

DEFAULT_REQUEST_HEADERS = {
 'Accept': 'text/html,application/xhtml xml,application/xml;q=0.9,*/*;q=0.8',    
 'Accept-Language': 'en',    
 'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.71 Safari/537.36',    
 'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11',    
 'User-Agent': 'Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.16 (KHTML, like Gecko) Chrome/10.0.648.133 Safari/534.16'
}

ITEM_PIPELINES = {
 'vmall_spider.pipelines.VmallSpiderPipeline': 300,
}

4.新建 start.py 运行调试入口文件

代码语言:javascript复制
from scrapy import cmdline
cmdline.execute("scrapy crawl vmall".split())

  • step4.本地数据库配置

工具:phpstudy-面板(小皮面板)

链接工具:Navicat for MySQL

运行

来源:

使用Python爬虫抓取图片和文字实验

https://lab.huaweicloud.com/testdetail.html?testId=468&ticket=ST-1363346-YzykQhBcmiNeURp6pgL0ahIy-sso

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