ruby - Net::HTTP.get 显示进度

Question

require 'net/http'

File.write(file_name, Net::HTTP.get(URI.parse(url)))

我想向用户展示这里发生了什么，比如进度，因为文件的大小可能很大。但是只有用户可能感兴趣的信息，而不是所有的调试信息。

Net::HTTP.get有这样的能力吗？

Answer 1

您可以在这里找到相关信息:http://ruby-doc.org/stdlib-2.1.1/libdoc/net/http/rdoc/Net/HTTP.html#class-Net::HTTP-label-Streaming+Response+Bodies

文档中用于此类事情的示例片段是:

require 'net/http'

uri = URI("http://apps.sfgov.org/datafiles/view.php?file=sfgis/citylots.zip")

Net::HTTP.start(uri.host, uri.port) do |http|
  request = Net::HTTP::Get.new uri

  http.request request do |response|
    file_size = response['content-length'].to_i
    amount_downloaded = 0

    open 'large_file', 'wb' do |io| # 'b' opens the file in binary mode 
      response.read_body do |chunk|
        io.write chunk
        amount_downloaded += chunk.size
        puts "%.2f%" % (amount_downloaded.to_f / file_size * 100)
      end
    end
  end
end