可以用 java.awt.geom.AffineTransform , 具体方法如下.
(width是新的长度,height是新的高度,image是改变大小之后的图片,source是原本从文件中读入的图片)
int width = 640;
int height = 380;
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
AffineTransform at = AffineTransform.getScaleInstance(
(double) width / source.getWidth(),
(double) height / source.getHeight());
g.drawRenderedImage(source, at);
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