JavaFX 图像序列化 [英] JavaFX Image serialization

问题描述

有没有办法序列化javafx.scene.image.Image?

我只找到了一种方法:创建自己的可序列化类，以像素格式(字节[][])存储图像数据.我不敢相信 JavaFX 没有内置的图像序列化机制.

I found only one method: create own serializable class which stores image data in pixel format(byte[][]). I can not believe that JavaFX have no built-in mechanism for image serialization.

这是我的 SerializableImage 类.

Here is my SerializableImage class.

import javafx.scene.image.Image;
import javafx.scene.image.PixelReader;
import javafx.scene.image.PixelWriter;
import javafx.scene.image.WritableImage;

import java.io.Serializable;


public class SerializableImage implements Serializable {
    private int width, height;
    private int[][] data;

    public SerializableImage() {}

    public void setImage(Image image) {
        width = ((int) image.getWidth());
        height = ((int) image.getHeight());
        data = new int[width][height];

        PixelReader r = image.getPixelReader();
        for (int i = 0; i < width; i++) {
            for (int j = 0; j < height; j++) {
                data[i][j] = r.getArgb(i, j);
            }
        }

    }

    public Image getImage() {
        WritableImage img = new WritableImage(width, height);

        PixelWriter w = img.getPixelWriter();
        for (int i = 0; i < width; i++) {
            for (int j = 0; j < height; j++) {
                w.setArgb(i, j, data[i][j]);
            }
        }

        return img;
    }

}

推荐答案

通常，您可以通过以常规图像格式存储图像来持久化(或流式传输)图像，您可以通过创建一个 java.awt 来实现.image.BufferedImage 表示和使用 javax.imageio.ImageIO API:

Typically you would persist (or stream) an image by storing it in a regular image format, which you can do by creating a java.awt.image.BufferedImage representation and using the javax.imageio.ImageIO API:

Image image = ... ;
ImageIO.write(SwingFXUtils.fromFXImage(image, null), "png", ...); 

ImageIO.write(...) 的第三个参数可以是 File 或 OutputStream.

The third argument to ImageIO.write(...) can be a File or OutputStream.

如果你有一些类想要序列化，其中包含一个Image，你可以创建一个自定义的序列化表单:

If you have some class you want to make serializable, which contains an Image, you can create a custom serialized form:

public class SomeClass implements Serializable {
    private transient Image image ;

    // other fields, etc...

    private void readObject(ObjectInputStream s) throws IOException, ClassNotFoundException {
        s.defaultReadObject();
        image = SwingFXUtils.toFXImage(ImageIO.read(s), null);
    }

    private void writeObject(ObjectOutputStream s) throws IOException {
        s.defaultWriteObject();
        ImageIO.write(SwingFXUtils.fromFXImage(image, null), "png", s);
    }
}

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