如何图像转换为BufferedImage的在Java中？ [英] How to convert Image to BufferedImage in Java?

问题描述

如何转换 图片 来的 的BufferedImage 在Java中？

How to convert Image to BufferedImage in Java?

请注意，这现有的应答显然是不正确的，因为它使用的方法<一href=\"http://docs.oracle.com/javase/8/docs/api/java/awt/Image.html#getWidth-java.awt.image.ImageObserver-\"相对=nofollow> 的getWidth（空） 和<一个href=\"http://docs.oracle.com/javase/8/docs/api/java/awt/Image.html#getHeight-java.awt.image.ImageObserver-\"相对=nofollow> 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 媒体跟踪​​的JavaDoc 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

I don't wish to add any GUI, I just need to download image or fail

好吧，如果你需要下载的形象，那么你可以只用 ImageIO.read（URL），看一看的阅读/加载图像了解更多详情...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

这篇关于如何图像转换为BufferedImage的在Java中？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！