如何在 Ruby on Rails 中读取远程文件的内容？

Question

here my file: http://example.com/test.txt

i have to read content of http://example.com/test.txt (a JSON string) and parse it in Ruby

Answer 1

I would suggest using open-uri :

require 'json'
require 'open-uri'
result = JSON.parse open('http://example.com/data.json').read

Answer 2

require 'net/http'
uri = URI('http://my.json.emitter/some/action')
json = Net::HTTP.get(uri)

json will contain the JSON string you fetched from uri .

Then read this StackOverflow post.

Answer 3

require 'json'
require 'open-uri'

uri = URI.parse 'http://example.com/test.txt'
json =
  begin
    json_file = uri.open.read
  rescue OpenURI::HTTPError => e
    puts "Encountered error pulling the file: #{e}"
  else
    JSON.parse json_file
  end

1. I specifically include open-uri , so that open is called from that module instead of attempting to call a private open from the Kernel module.
2. I intentionally parse the URL to avoid a security risk - https://rubydoc.info/gems/rubocop/RuboCop/Cop/Security/Open
3. Unlike some commenters pointed out above, OpenURI does indicate the HTTP status code of an error.