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# milkSpider
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selenium + redis + 分布式 + xpath + etree + 可视化
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任务：爬取京东网站上在售的各类牛奶品类的商品名称，简介，价格相关，评论区相关。并给出相应的价格波动趋势，精选好评，用python的可视化展示。计划任务自动爬取。
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## TODO
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- [x] 初始化 selenium 框架，编写好相应的爬取规则，初步实现小规模爬取内容
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- [ ] 考虑user-agent，ip池，cookie，token，实现更大规模爬取内容
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- [ ] 从历史价格网页爬取历史价格，比对，给出价格波动趋势
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- [x] 加入Redis分布式设计
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- [ ] 数据可视化
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- [ ] 定时，自动化爬取
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## project
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### 项目目录
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> Selesium
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>
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> > downloader.py 下载器，即爬取内容
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> >
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> > middlewares.py 配置分布式，线程，redis相关内容
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> >
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> > pipelines.py 处理得到的数据，存储到相应文件
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> >
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> > milkSpider.py 主文件，配置爬取设置，自动化等
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> >
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> > items.py 暂定
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### selenium
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配置下载器，利用selenium模拟浏览器正常浏览行为
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```python
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# -*- coding: utf-8 -*-
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from selenium import webdriver
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from selenium.webdriver.chrome.options import Options
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from lxml import etree
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def getsource(url):
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init = Options()
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init.add_argument('--no-sandbox')
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init.add_argument('--headless')
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init.add_argument('--disable-gpu')
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init.add_argument("disable-cache")
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init.add_argument('disable-infobars')
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init.add_argument('log-level=3') # INFO = 0 WARNING = 1 LOG_ERROR = 2 LOG_FATAL = 3 default is 0
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init.add_experimental_option("excludeSwitches",['enable-automation','enable-logging'])
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driver = webdriver.Chrome(chrome_options = init)
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driver.implicitly_wait(10)
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driver.get(url)
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response = etree.HTML(driver.page_source)
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response = etree.tostring(response, encoding = "utf-8", pretty_print = True, method = "html")
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response = response.decode('utf-8')
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driver.close()
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return response
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```
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## 安装，初始化
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### GIT
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```powershell
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# 安装git
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winget install --id Git.Git -e --source winget
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## 或者官网下载
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https://git-scm.com/download/win
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# 在powershell中使用
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vim $PROFILE
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## 修改相应的位置为 GITPATH = ~/Git/cmd/git.exe
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## SetAlias git $GITPATH
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git init
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git remote add origin https://bdgit.educoder.net/mf942lkca/milkSpider.git
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git pull https://bdgit.educoder.net/mf942lkca/milkSpider.git
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git remote -v # 查看远程仓库信息
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touch .gitignore # 创建忽略上传控制文件
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git commit -m "update" # 先添加一个commit
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git add *.py # 添加要push的本地内容到一个本地临时仓库
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git push -u origin master # push, 出错就 -f(注意会造成不可回避的损失)
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```
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### selenium
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安装
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```powershell
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# 安装selenium
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pip3 install selenium
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# 查看配置信息
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pip how selenium
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```
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调用时导入的内容
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```python
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from selenium import webdriver
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from selenium.webdriver.chrome.options import Options
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chrome_options = Options()
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chrome_options.add_argument('--headless') # 无界面
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chrome_options.add_argument('--no-sandbox') # 解决DevToolsActivePort文件不存在报错问题
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chrome_options.add_argument('--disable-gpu') # 禁用GPU硬件加速。如果软件渲染器没有就位，则GPU进程将不会启动。
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chrome_options.add_argument('--disable-dev-shm-usage')
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chrome_options.add_argument('--window-size=1920,1080') # 设置当前窗口的宽度和高度
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driver = webdriver.Chrome('chromedriver',chrome_options=chrome_options)
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#driver = webdriver.Chrome()
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url = ""
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driver.get(url)
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print(driver.page_source)
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driver.quit()
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```
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一些备忘录
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```python
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text = """this is test content;这是测试内容。"""
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html1 = etree.HTML(text)
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# html1 = etree.fromstring(text) # 同HTML()
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# 方法1 使用html.unescape()
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res = etree.tostring(html1)
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print(html.unescape(res.decode('utf-8')))
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# 方法2 使用uft-8编码
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res = etree.tostring(html1,encoding="utf-8") # 这种方法对标签用的中文属性无效
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print(res.decode('utf-8'))
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# 方法1 使用open读取文档做字符串处理
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with open('test.html') as f:
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html1 = etree.HTML(f.read())
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# 之后代码同 处理字符串 的两种方法
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# 方法2 parse读取文档时指定编码方式
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html1 = etree.parse('test.html',etree.HTMLParser(encoding='utf-8'))
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# 这里要指定正确（与所读取文档相应的编码）的编码方式，不然后面会出现乱码
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# 之后代码同 处理字符串 的两种方法
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```
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### ChromeDriver
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下载 [ChromeDriver](https://chromedriver.chromium.org/home) 放到 python 根目录就行
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### Redis
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[介绍，配置](C:\Users\wkyuu\Desktop\my\SQL\Redis\Redis - NoSql高速缓存数据库.md)
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```python
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# 安装 redis 模块
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## pip install redis
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# 实例对象
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redisconn = redis.Redis(host = '127.0.0.1', port = '6379', password = 'x', db = 0)
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# redis 取出的结果默认是字节，我们可以设定 decode_responses=True 改成字符串
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```
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## 备注
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在没有使用线程之前，完整跑完五个种类共(30 x 10 x 5 = 1500)条数据，用时365s
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使用线程数为5的情况下，完整跑完五个种类共 1500条数据，用时130s
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使用线程数为16的情况下，完整跑完五个种类共 1500条数据，用时80s
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## 参考链接
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1，[selenium+python自动化100-centos上搭建selenium启动chrome浏览器headless无界面模式](https://www.cnblogs.com/yoyoketang/p/11582012.html)
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2，[解决：'chromedriver' executable needs to be in PATH问题](https://www.cnblogs.com/Neeo/articles/13949854.html)
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3，[Python selenium-chrome禁用打印日志输出](https://blog.csdn.net/wm9028/article/details/107536929)
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4，[Python将list逐行读入到csv文件中](https://blog.csdn.net/weixin_41068770/article/details/103145660)
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5，[Git中使用.gitignore忽略文件的推送](https://blog.csdn.net/lk142500/article/details/82869018)
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6，[python 3 实现定义跨模块的全局变量和使用](https://codeantenna.com/a/9YbdOKrrSJ)
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7，[Python 多线程](https://www.runoob.com/python/python-multithreading.html)
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8，[Python redis 使用介绍](https://www.runoob.com/w3cnote/python-redis-intro.html)
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9，[python + redis 实现 分布式队列任务](https://cloud.tencent.com/developer/article/1697383)
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10，[深入理解Python线程中join()函数](https://www.linuxidc.com/Linux/2019-03/157795.htm)
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11， |
