java - 如何在java中精确复制图像？

Question

加载图像后，我想创建图像的精确副本，从而使质量和比例保持不变。使用我当前的代码，质量降低了。

public class Image {
    private static final String path = "C:/Users.../src/7horses.jpg";
    private static final File file = new File(path);

    static BufferedImage deepCopy(BufferedImage bi) throws IOException {
        String saveAs = "copy.jpg";
        ColorModel cm = bi.getColorModel();
        boolean isAlphaPremultiplied = cm.isAlphaPremultiplied();
        WritableRaster raster = bi.copyData(null);
        BufferedImage cImg = new BufferedImage(cm, raster, isAlphaPremultiplied, null);
        File saveImage = new File("C:/Users.../src", saveAs);
        ImageIO.write(cImg, "jpg", saveImage);
        return cImg;
    }

    public static void main(String[] args) throws IOException {
        BufferedImage cp, img;
        img = ImageIO.read(file); 
        cp = deepCopy(img);
    }
}

Answer 1

尝试复制您的图像文件，使用以下代码:

        InputStream is = null;
        OutputStream os = null;
        try {
            is = new FileInputStream(new File("path/to/img/src"));
            os = new FileOutputStream(new File("path/to/img/dest"));
            byte[] buffer = new byte[1024];
            int length;
            while ((length = is.read(buffer)) > 0) {
                os.write(buffer, 0, length);
            }
        } finally {
            is.close();
            os.close();
        }

如果您使用的是Java 8，那么您只需调用Files.copy方法即可，在 docs 中检查它