在 Clojure 中，如何从 Web 下载图像并将其保存到文件系统? [英] In Clojure, how do you download an image from the web and save it to your file system?

问题描述

如何使用 Clojure 从 Web 下载图像并将其保存到文件系统?我知道图像 url 并且我知道我不能使用 spit 和 slurp 来做到这一点，因为它是二进制数据，而不是文本.

How do you download an image from the web and save it to your file system using Clojure? I know the image url and I'm aware that I can't use spit and slurp to do this because it's binary data, not text.

我想尽可能简单地做到这一点，理想情况下就像吐痰和啜饮一样.也就是说，没有很多额外的行使用缓冲区或字节数组.我想在完成后关闭流，但我不在乎它是否效率低下.

I'd like to do this as simply as possible, ideally like how spit and slurp work. That is, without a lot of extra lines using buffers or byte arrays. I want to close the streams when I'm done, but I don't care if it's inefficient.

推荐答案

何志同 指向我这个解决方案，最适合我的目的:

Zhitong He pointed me to this solution, which worked best for my purposes:

 (defn copy [uri file]
  (with-open [in (io/input-stream uri)
              out (io/output-stream file)]
    (io/copy in out)))

正如智通所说，你需要在你的命名空间中使用 (:require [clojure.java.io :as io]) 来使用它作为编码.或者，您可以直接参考 clojure.java.io:

As Zhitong notes, you'll need (:require [clojure.java.io :as io]) in your namespace to use this as coded. Alternatively, you could refer to clojure.java.io directly:

(defn copy-uri-to-file [uri file]
  (with-open [in (clojure.java.io/input-stream uri)
              out (clojure.java.io/output-stream file)]
    (clojure.java.io/copy in out)))

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