java实现缩小图片

public void CompressSize(int sysheight, int syswidth, String filename) {
		this.filename = filename;
		File file = new File(filename);
		Image simg;
		try {
			// 将图片缩小
			BufferedImage img = ImageIO.read(file);
			simg = img.getScaledInstance(sysheight, syswidth,
					BufferedImage.SCALE_DEFAULT);
		} catch (IOException e) {
		}
	}

CSDN上看来的,没有经过测试.