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ダウンロードしたHTMLに対してスクレイピングしてCSV出力

Posted at

ダウンロードしたHTMLファイルに対してスクレイピングをかけてCSV出力したいときにどうぞ

(例えば。。。ツイッターのフォロワー画面は無限スクロール機能があると思います。最深部までスクロールした状態のHTMLをchoromeの検証機能でダウンロードしたらCSV形式であなたのフォロワーリストが作れますよ)


ディレクトリ構造
scraping
┝ target_html
┃ ┗ target.html
┝ scraping.rb
┗ result.csv


対象HTMLの構造

target.html
(省略)
<tr>
  (省略)
  <div class="name">
    <a>
      <span>なまえー</span>
    </a>
  </div>
 (省略)
  <div class="id">
    <a>あいでぃー</a>
  </div>
 (省略)
</tr>
(以下複数の別のtr)

scraping.rb
require "nokogiri"
require "csv"

f = File.open('./scraping/target_html/target.html')
doc = Nokogiri::HTML(f)

infos = []
trs = doc.xpath('//tr')

trs.each do |tr|
  name = tr.css('div[@class="name"]').css('a').css('span').inner_text
  id = tr.css('div[@class="id"]').css('a').inner_text
  info = [name,id]
  infos << info
end

CSV.open('result.csv', 'w') do |csv|
  infos.each do |info|
    csv << info
  end
end

f.close()

###結果

result.csv
なまえー,あいでぃー
なまえー1,あいでぃー1
なまえー2,あいでぃー2
 ︙

以上

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