从本地文件或 url 打开 IO 流 [英] Open an IO stream from a local file or url

问题描述

我知道有其他语言的库可以采用包含本地文件路径或 url 的字符串，并将其作为可读 IO 流打开.

I know there are libs in other languages that can take a string that contains either a path to a local file or a url and open it as a readable IO stream.

在 ruby​​ 中是否有一种简单的方法可以做到这一点?

Is there an easy way to do this in ruby?

推荐答案

open-uri 是标准 Ruby 库的一部分，它将重新定义 open 的行为，以便您可以打开 url 以及本地文件.它返回一个 File 对象，因此您应该能够调用诸如 read 和 readlines 之类的方法.

open-uri is part of the standard Ruby library, and it will redefine the behavior of open so that you can open a url, as well as a local file. It returns a File object, so you should be able to call methods like read and readlines.

require 'open-uri'
file_contents = open('local-file.txt') { |f| f.read }
web_contents  = open('http://www.stackoverflow.com') {|f| f.read }

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