如何从 URL 对象(图像)创建文件对象

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In order to create a File from a HTTP URL you need to download the contents from that URL:

URL url = new URL("http://www.google.ro/logos/2011/twain11-hp-bg.jpg");
URLConnection connection = url.openConnection();
InputStream in = connection.getInputStream();
FileOutputStream fos = new FileOutputStream(new File("downloaded.jpg"));
byte[] buf = new byte[512];
while (true) {
int len = in.read(buf);
if (len == -1) {
break;
}
fos.write(buf, 0, len);
}
in.close();
fos.flush();
fos.close();

The downloaded file will be found at the root of your project: {project}/downloaded.jpg

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Use Apache Common IO's FileUtils:

import org.apache.commons.io.FileUtils


FileUtils.copyURLToFile(url, f);

The method downloads the content of url and saves it to f.

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最佳答案

You can make use of ImageIO in order to load the image from an URL and then write it to a file. Something like this:

URL url = new URL("http://google.com/pathtoaimage.jpg");
BufferedImage img = ImageIO.read(url);
File file = new File("downloaded.jpg");
ImageIO.write(img, "jpg", file);

This also allows you to convert the image to some other format if needed.

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You can convert the URL to a String and use it to create a new File. e.g.

URL url = new URL("http://google.com/pathtoaimage.jpg");
File f = new File(url.getFile());

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Since Java 7

File file = Paths.get(url.toURI()).toFile();