Ruby 如何使用nokogiri从URL列表中提取数据并将数据保存到CSV

我有一个名为bontyurls.csv的文件，如下所示：

http://bontrager.com/model/11383
http://bontrager.com/model/01740
http://bontrager.com/model/09595

我想让我的脚本读取该文件，然后输出一个如下文件：bonty_test_url_results.csv

url,model_names
http://bontrager.com/model/11383,"Road TLR Conversion Kit"
http://bontrager.com/model/01740,"404 File Not Found"
http://bontrager.com/model/09595,"RXL Road"

以下是到目前为止我得到的信息：

# based on code from here: http://www.andrewsturges.com/2011/09/how-to-harvest-web-data-using-ruby-and.html

require 'nokogiri'
require 'open-uri'
require 'csv'

@urls = Array.new
@model_names = Array.new

urls = CSV.read("bontyurls.csv")
(0..urls.length - 1).each do |index|
  puts urls[index][0]
  doc = Nokogiri::HTML(open(urls[index][0]))
  doc.xpath('//h1').each do |model_name|
    @model_name << model_name.content
  end
end

# write results to file  
CSV.open("bonty_test_urls_results.csv", "wb") do |row|
  row << ["url", "model_names"]
  (0..@urls.length - 1).each do |index|
    row << [
      @urls[index], 
      @model_names[index]]
  end
end

此外，我还没有弄清楚如何处理返回404的URL。

我会这样做：

require 'csv'
require 'nokogiri'
require 'open-uri'

CSV_OPTIONS = {
  :write_headers => true,
  :headers => %w[url model_names]
}

CSV.open('bonty_test_urls_results.csv', 'wb', CSV_OPTIONS) do |csv|
  csv_doc = File.foreach('bontyurls.csv') do |url|
    url.chomp!
    begin
      doc = Nokogiri.HTML(open(url))
      h1 = doc.at('h1').text.strip
      h1 = doc.at('title').text.strip.sub(/^Bontrager: /i, '') if (h1.empty?)
      csv << [url, h1]
    rescue OpenURI::HTTPError => e
      csv << [url, e.message]
    end
  end
end

---

您声明@model\u名称，但尝试将其推入@model\u名称，这就是它为零的原因。

@pguardiario，在OP的问题中是

wb

。有时CSV数据包含8位字符，所以我保留了该设置。

require 'open-uri'
require 'nokogiri'

doc = Nokogiri::HTML(open("http://bontrager.com/model/09124"))
doc.xpath('//h1').each do |node|
  puts node.text
end

require 'csv'
require 'nokogiri'
require 'open-uri'

CSV_OPTIONS = {
  :write_headers => true,
  :headers => %w[url model_names]
}

CSV.open('bonty_test_urls_results.csv', 'wb', CSV_OPTIONS) do |csv|
  csv_doc = File.foreach('bontyurls.csv') do |url|
    url.chomp!
    begin
      doc = Nokogiri.HTML(open(url))
      h1 = doc.at('h1').text.strip
      h1 = doc.at('title').text.strip.sub(/^Bontrager: /i, '') if (h1.empty?)
      csv << [url, h1]
    rescue OpenURI::HTTPError => e
      csv << [url, e.message]
    end
  end
end

url,model_names
http://bontrager.com/model/11383,Road TLR Conversion Kit (Model #11383)
http://bontrager.com/model/01740,404 File Not Found
http://bontrager.com/model/09595,RXL Road (Model #09595)