Java一种减少图片存储空间的方法(转换成jpg格式)

public static void thumbImage(String input,String newFile) throws Exception {
Image src = javax.imageio.ImageIO.read(new File(input));
int width = src.getWidth(null);// 获取图源宽度
int height = src.getHeight(null);// 获取图源高度
BufferedImage thumb = new BufferedImage(width / 1, height / 1,
BufferedImage.TYPE_INT_RGB);
// 绘制缩小后的图
thumb.getGraphics().drawImage(src, 0,  0, width / 1, height / 1, null);
File file = new File(newFile);// 输出到文件流
ImageIO.write(thumb, "jpg", file);
}