来自File的java.awt.Image

Question

如何从文件加载java.awt.Image对象，并知道它何时加载？

Answer 1

The ImageIO helper class offers methods to read and write images from/to files and streams.

To read an image from a file, you can use ImageIO.read(File) (which returns a BufferedImage ). But since BufferedImage is a subclass of Image , you can do:

try {
    File pathToFile = new File("image.png");
    Image image = ImageIO.read(pathToFile);
} catch (IOException ex) {
    ex.printStackTrace();
}

Answer 2

Use a java.awt.MediaTracker .

Here's a full example .

Basically,

 toolkit = Toolkit.getDefaultToolkit();
 tracker = new MediaTracker(this);
 Image image = toolkit.getImage("mandel.gif");
 tracker.addImage(image, 0);
 tracker.waitForAll();

Answer 3

I would use an ImageIcon . So doing, you don't have to bother about any checked exceptions. Also note that it uses a MediaTracker when loading images from file resources.

ImageIcon icon = new ImageIcon("image.png");
Image image = icon.getImage();