ruby 如何通过 HTTP 将图像文件下载到临时文件中？
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How to download an image file via HTTP into a temp file?
提问by Dogweather
I've found good examplesof NET::HTTP for downloading an image file, and I've found good examplesof creating a temp file. But I don't see how I can use these libraries together. I.e., how would the creation of the temp file be worked into this code for downloading a binary file?
我发现很好的例子NET :: HTTP的下载一个图像文件，我已经找到了很好的例子创建一个临时文件。但是我不知道如何一起使用这些库。即，如何将临时文件的创建用于下载二进制文件的代码中？
require 'net/http'
Net::HTTP.start("somedomain.net/") do |http|
resp = http.get("/flv/sample/sample.flv")
open("sample.flv", "wb") do |file|
file.write(resp.body)
end
end
puts "Done."
采纳答案by maerics
require 'net/http'
require 'tempfile'
require 'uri'
def save_to_tempfile(url)
uri = URI.parse(url)
Net::HTTP.start(uri.host, uri.port) do |http|
resp = http.get(uri.path)
file = Tempfile.new('foo', Dir.tmpdir, 'wb+')
file.binmode
file.write(resp.body)
file.flush
file
end
end
tf = save_to_tempfile('http://a.fsdn.com/sd/topics/transportation_64.png')
tf # => #<File:/var/folders/sj/2d7czhyn0ql5n3_2tqryq3f00000gn/T/foo20130827-58194-7a9j19>
回答by fguillen
There are more api-friendly libraries than Net::HTTP, for example httparty:
有比 更 api 友好的库Net::HTTP，例如httparty：
require "httparty"
url = "https://upload.wikimedia.org/wikipedia/commons/thumb/9/91/DahliaDahlstarSunsetPink.jpg/250px-DahliaDahlstarSunsetPink.jpg"
File.open("/tmp/my_file.jpg", "wb") do |f|
f.write HTTParty.get(url).body
end
回答by Daniel Cukier
I like to use RestClient:
我喜欢使用 RestClient：
file = File.open("/tmp/image.jpg", 'wb' ) do |output|
output.write RestClient.get("http://image_url/file.jpg")
end
回答by Shahzeb Khan
Though the answers above work totally fine, I thought I would mention that it is also possible to just use the good ol' curlcommand to download the file into a temporary location. This was the use case that I needed for myself. Here's a rough idea of the code:
虽然上面的答案完全正常，但我想我会提到也可以只使用 good ol'curl命令将文件下载到临时位置。这是我自己需要的用例。这是代码的粗略概念：
# Set up the temp file:
file = Tempfile.new(['filename', '.jpeg'])
#Make the curl request:
url = "http://example.com/image.jpeg"
curlString = "curl --silent -X GET \"#{url}\" -o \"#{file.path}\""
curlRequest = `#{curlString}`
