Write JavaFX Blob data field image - javafx

Question

In my class, the attribute where the image will be saved is defined like this:
#Lob
#Column(name = "NOTA_FISCAL", nullable = false, columnDefinition = "mediumblob")
public byte[] getNOTA_FISCAL() {
return NOTA_FISCAL;
}
public void setNOTA_FISCAL(byte[] NOTA_FISCAL) {
this.NOTA_FISCAL = NOTA_FISCAL;
}
In a project I made using Swing, I used JFileChooser to read an image from my computer to later insert it into the database, we can see that the file is converted to Bytes before inserting the item.
private void selecionarNF(ActionEvent event) {
JFileChooser fc = new JFileChooser();
int res = fc.showOpenDialog(null);
if (res == JFileChooser.APPROVE_OPTION) {
File arquivo = fc.getSelectedFile();
System.out.println("Arquivo: " + arquivo + "");
textCaminhoNF.setText(String.valueOf(arquivo));
try {
byte[] fotonf = new byte[(int) arquivo.length()];
FileInputStream fileInputfotonf = new FileInputStream(arquivo);
fileInputfotonf.read(fotonf);
fileInputfotonf.close();
fotoNF = fotonf;
} catch (Exception ex) {
// System.out.println(ex.printStackTrace().toString());
}
} else {
JOptionPane.showMessageDialog(null, "Você nao selecionou nenhum arquivo.");
}
I'm implementing it with JavaFX, I could even continue using Swing, but I intend to use the Windows file explorer, this way using FileChooser, however I'm having problems capturing the image and passing it to an object of type File, the . getSelectedFile() doesn't exist for FileChooser, I searched a lot on the internet and couldn't find a way to capture this file. What would be the correct way?
Stage s = new Stage();
FileChooser fc = new FileChooser();
textCaminhoNF.setText(fc.showOpenDialog(s).getAbsolutePath());
File arquivo = fc.getSelectedFile(); //his line shows the error, because there is no .getSelectItem
if (fc != null) {
System.out.println("No is null");
try
{
byte[] fotonf = new byte[(int) fc.length()];
FileInputStream fileInputfotonf = new FileInputStream(fc);
fileInputfotonf.read(fotonf);
fileInputfotonf.close();
fotoNF = fotonf;
} catch (Exception ex) {
// System.out.println(ex.printStackTrace().toString());
}
}

Answer 1

I agree with what #slaw has mentioned. You are not saving the file reference returned from showOpenDialog.
Below is a quick demo [from my archives ;-) ] when I tried to check the behavior of FileChooser:
import javafx.application.Application;
import javafx.embed.swing.SwingFXUtils;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.VBox;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
public class ChooseImage_Demo extends Application {
ImageView myImageView;
public static void main(String[] args) {
launch(args);
}
#Override
public void start(Stage primaryStage) {
Button button = new Button("Search for Image");
button.setOnAction(e -> {
FileChooser fileChooser = new FileChooser();
File file = fileChooser.showOpenDialog(null);
try {
BufferedImage bufferedImage = ImageIO.read(file);
Image image = SwingFXUtils.toFXImage(bufferedImage, null);
myImageView.setImage(image);
} catch (IOException ex) {
ex.printStackTrace();
}
});
myImageView = new ImageView();
myImageView.setFitWidth(500);
myImageView.setPreserveRatio(true);
VBox vBox = new VBox(10);
vBox.getChildren().addAll(button, myImageView);
vBox.setAlignment(Pos.TOP_CENTER);
Scene scene = new Scene(vBox, 800, 800);
primaryStage.setTitle("Image Chooser");
primaryStage.setScene(scene);
primaryStage.show();
}
}

Answer 2

Thanks for the help, I did it this way and it worked, it's writing correctly to the database too.
#FXML
private void selecionarNF(ActionEvent event) {
ImageView myImageView = null;
myImageView = new ImageView();
FileChooser fileChooser = new FileChooser();
File file = fileChooser.showOpenDialog(null);
try {
BufferedImage bufferedImage = ImageIO.read(file);
Image image = SwingFXUtils.toFXImage(bufferedImage, null);
myImageView.setImage(image);
imageToByte(String.valueOf(file));
} catch (IOException ex) {
ex.printStackTrace();
}
textCaminhoNF.setText(String.valueOf(file));
}