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

如何从Web下载图像并使用Clojure将其保存到文件系统？我知道图像url，我知道我不能使用 spit 和 slurp 这样做，因为它二进制数据，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.

我想尽可能地做到这一点，理想情况下如何吐和slurp工作。也就是说，没有很多额外的行使用缓冲区或字节数组。我想关闭流，当我完成，但我不在乎如果它是低效的。

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

Zhitong He 指向我到此解决方案，它最适合我的目的：

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Zhitong所说，你需要（：require [clojure.java.io：as io]）在您的命名空间中使用它作为编码。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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