JavaFX：从 FileChooser 获取图像并将其保存在一个字节 []

Question

I want to select an image using FileChooser and then save the selected image in a byte[] variable, I open the dialog

FileChooser fileChooser = new FileChooser();
fileChooser.setTitle("Open Resource File");
fileChooser.showOpenDialog(new Stage());

Now, How can I get the image file from FileChooser and save it in byte[] variable?

Answer 1

You can use Files.readAllBytes(Path path) :

FileChooser fileChooser = new FileChooser();
fileChooser.getExtensionFilters().add(new FileChooser.ExtensionFilter("PNG", "*.png"));
File pngImage = fileChooser.showOpenDialog(window);
if (pngImage != null) {
    try {
        byte[] imageBytes = Files.readAllBytes(pngImage.toPath());
    } catch (IOException e) {
        System.err.println("File couldn't be read to byte[].");
    }
}

An alternative: IOUtils :

byte[] bytes = IOUtils.toByteArray(new FileInputStream(pngImage));