Compress multi files to .zip

Compress multi files to .zip

package javafx_zip;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.FileChooser;
import javafx.stage.Stage;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFX_Zip extends Application {

    File fileSrc;
    private static final int bufferSize = 8192;

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Hello World!");

        final Label labelFile = new Label();

        Button btn = new Button();
        btn.setText("Open FileChooser'");
        btn.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {

                FileChooser fileChooser = new FileChooser();

                //Set extension filter
                FileChooser.ExtensionFilter extFilter =
                        new FileChooser.ExtensionFilter("files (*.*)", "*.*");
                fileChooser.getExtensionFilters().add(extFilter);
                List<File> fileSrcList = fileChooser.showOpenMultipleDialog(null);

                String targetZipFile = fileSrcList.get(0).getParent() + "/compressed.zip";

                try {
                    //Compress file
                    ZipOutputStream zipOutputStream;

                    FileOutputStream fileOutputStream =
                            new FileOutputStream(targetZipFile);
                    zipOutputStream = new ZipOutputStream(fileOutputStream);

                    for (File f : fileSrcList) {
                        String source = f.getPath();
                        String entryName = f.getName();
                        
                        ZipEntry zipEntry = new ZipEntry(entryName);
                        zipOutputStream.putNextEntry(zipEntry);

                        byte[] buffer = new byte[bufferSize];
                        try (FileInputStream fileInputStream = new FileInputStream(source)) {
                            int numberOfByte;

                            while ((numberOfByte = fileInputStream.read(buffer, 0, bufferSize))
                                    != -1) {
                                zipOutputStream.write(buffer, 0, numberOfByte);
                            }
                        }
                    }
                    zipOutputStream.close();
                    labelFile.setText("Compressed file saved as: " + targetZipFile);
                } catch (IOException ex) {
                    Logger.getLogger(JavaFX_Zip.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        });

        VBox vBox = new VBox();
        vBox.getChildren().addAll(labelFile, btn);

        StackPane root = new StackPane();
        root.getChildren().add(vBox);
        primaryStage.setScene(new Scene(root, 300, 250));
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}