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douban-crawler

利用Python的Scrapy框架爬取豆瓣电影信息，项目添加了user-agent和proxy代理两种方式来进行爬虫隐藏，并将获取的数据保存到MongoDB中。

请合法进行爬虫行为！

Quick Start

启动应用

pip install -r requirements.txt

然后运行__init__.py文件即可

应用截图

img.png

scrapy框架组成

img.png

各部分组成

  • Scrapy Engine：中心引擎，负责通讯，信号，传输数据等
  • Downloader：下载器，下载引擎发送的所有请求，并将其获取到的response交还给引擎
  • Scheduler：调度器，接受引擎发送过来的请求，并按照一定的方式进行整理排列入队，当引擎需要时交还给引擎
  • Spider：负责处理所有response，从中分析提取数据，获取Item字段需要的数据，并将需要跟进的新的URL提交给引擎，进一步爬取
  • Item Pipeline：负责处理Spider中获取到的Item，并进行进行后期处理（详细分析、过滤、存储等）
  • Downloader Middlewares：可以自定义扩展或封装下载功能的组件
  • Spider Middlewares：可以自定义扩展和操作Spider和Engine之间的URL请求的组件

数据流

数据流如图所示

MongoDB数据库安装

OSX安装MongoDB

brew tap mongodb/brew
brew install [email protected]
# @后为版本

MongoDB使用注意

MongoDB中的数据库不是实时创建的，需要在插入了文档后，才能够生效（show dbs才能查询到）

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