问题描述
如何转换来的在Java中？
How to convert Image to BufferedImage in Java?
请注意，这显然是不正确的，因为它使用的方法 的getWidth（空） 和 的getHeight（空） ，它可以返回 1 ，如果图像是不尚未加载（图片，顾名思义，异步对象）。
Note, that existing answer is apparently not correct, because it uses methods getWidth(null) and getHeight(null), which can return -1 if image is not loaded yet (Image is, by definition, an asynchronous object).
请，请提供更正确的答案，以上证明，现有的答案已经是正确的。
Please, provide either more correct answer, or more proofs that existing answer is already correct.
推荐答案
如果这对你很重要，你可以使用媒体跟踪来等待的形象是加载，那么你并不需要关心提供一个的ImageObserver
If it's important to you, you can use a MediaTracker to "wait" for the image to be loaded, then you don't need to care about supplying a ImageObserver
try {
MediaTracker mt = new MediaTracker(new JPanel());
Image image = Toolkit.getDefaultToolkit().createImage("...");
mt.addImage(image, 0);
System.out.println("Wait for...");
mt.waitForAll();
System.out.println("I be loaded");
BufferedImage bi = new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = bi.createGraphics();
g2d.drawImage(image, 0, 0, null);
g2d.dispose();
} catch (InterruptedException ex) {
ex.printStackTrace();
}
看一看了解更多详情
Have a look at MediaTracker JavaDocs for more details
我不希望添加任何图形用户界面，我只需要下载图片或失败
好吧，如果你需要下载的形象，那么你可以只用 ImageIO.read（URL），看一看的了解更多详情...那么你就不会需要关心关于图片或媒体跟踪，因为的ImageIO 返回的BufferedImage
Okay, if you "need to download" the image, then you can just use ImageIO.read(URL), have a look at Reading/Loading an Image for more details ... then you won't need to care about Image or MediaTracker, as ImageIO returns a BufferedImage
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