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画像ファイルを参照し、Java Swingを使用して表示します

ここでの私の問題は、クリックした後です Browse ボタンをクリックすると、選択するディレクトリ内のすべてのファイルが表示され、選択した画像がGUIに正しく表示されます。しかし、2回目に[参照]ボタンをクリックすると、新しい画像ではなく、古い画像のみが表示されます。これで私を助けてください。

参考までに、UIをアップロードしました。

package GUI;

import Java.awt.BorderLayout;
import Java.awt.EventQueue;
import Java.awt.Graphics2D;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.JButton;
import Java.awt.event.ActionListener;
import Java.awt.event.ActionEvent;
import Java.awt.image.BufferedImage;
import Java.io.File;
import Java.io.IOException;
import Java.util.logging.Level;
import Java.util.logging.Logger;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;


@SuppressWarnings("serial")
public class MainAppFrame extends JFrame {

    private JPanel contentPane;
    File targetFile;
    BufferedImage targetImg;
    public JPanel panel,panel_1;
    private static final int baseSize = 128;
    private static final String basePath =![enter image description here][1]
            "C:\\Documents and Settings\\Administrator\\Desktop\\Images";

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    MainAppFrame frame = new MainAppFrame();
                    frame.setVisible(true);
                    frame.setResizable(false);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public MainAppFrame() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 550, 400);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(new BorderLayout(0, 0));

        panel = new JPanel();
        panel.setBorder(new javax.swing.border.LineBorder(new Java.awt.Color(0, 0, 0), 1, true));
        contentPane.add(panel, BorderLayout.WEST);

        JButton btnBrowse = new JButton("Browse");
        btnBrowse.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                browseButtonActionPerformed(e);
            }
        });

        JLabel lblSelectTargetPicture = new JLabel("Select target picture..");

        JButton btnDetect = new JButton("Detect");
        btnDetect.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
            }
        });

        JButton btnAddDigit = new JButton("Add Digit");
        btnAddDigit.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
            }
        });

        JButton button = new JButton("Recognize");
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
            }
        });

        panel_1 = new JPanel();
        panel_1.setBorder(new javax.swing.border.LineBorder(new Java.awt.Color(0, 0, 0), 1, true));

        GroupLayout gl_panel = new GroupLayout(panel);
        gl_panel.setHorizontalGroup(
            gl_panel.createParallelGroup(Alignment.LEADING)
                .addGroup(gl_panel.createSequentialGroup()
                    .addGap(6)
                    .addGroup(gl_panel.createParallelGroup(Alignment.LEADING)
                        .addGroup(gl_panel.createSequentialGroup()
                            .addComponent(lblSelectTargetPicture)
                            .addGap(6)
                            .addComponent(btnBrowse))
                        .addGroup(gl_panel.createSequentialGroup()
                            .addGap(10)
                            .addComponent(btnDetect)
                            .addGap(18)
                            .addComponent(btnAddDigit))))
                .addGroup(gl_panel.createSequentialGroup()
                    .addGap(50)
                    .addComponent(button))
                .addGroup(gl_panel.createSequentialGroup()
                    .addContainerGap()
                    .addComponent(panel_1, GroupLayout.PREFERRED_SIZE, 182, GroupLayout.PREFERRED_SIZE))
        );
        gl_panel.setVerticalGroup(
            gl_panel.createParallelGroup(Alignment.LEADING)
                .addGroup(gl_panel.createSequentialGroup()
                    .addGroup(gl_panel.createParallelGroup(Alignment.LEADING)
                        .addGroup(gl_panel.createSequentialGroup()
                            .addGap(7)
                            .addComponent(lblSelectTargetPicture))
                        .addGroup(gl_panel.createSequentialGroup()
                            .addGap(3)
                            .addComponent(btnBrowse)))
                    .addGap(18)
                    .addComponent(panel_1, GroupLayout.PREFERRED_SIZE, 199, GroupLayout.PREFERRED_SIZE)
                    .addGap(22)
                    .addGroup(gl_panel.createParallelGroup(Alignment.BASELINE)
                        .addComponent(btnDetect)
                        .addComponent(btnAddDigit))
                    .addGap(18)
                    .addComponent(button)
                    .addContainerGap())
        );

        panel.setLayout(gl_panel);
    }
    public BufferedImage rescale(BufferedImage originalImage)
    {
        BufferedImage resizedImage = new BufferedImage(baseSize, baseSize, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = resizedImage.createGraphics();
        g.drawImage(originalImage, 0, 0, baseSize, baseSize, null);
        g.dispose();
        return resizedImage;
    }
    public void setTarget(File reference)
    {
        try {
            targetFile = reference;
            targetImg = rescale(ImageIO.read(reference));
        } catch (IOException ex) {
            Logger.getLogger(MainAppFrame.class.getName()).log(Level.SEVERE, null, ex);
        }

        panel_1.setLayout(new BorderLayout(0, 0));
        panel_1.add(new JLabel(new ImageIcon(targetImg))); 
        setVisible(true);
    }
    private void browseButtonActionPerformed(Java.awt.event.ActionEvent evt) {
        JFileChooser fc = new JFileChooser(basePath);
        fc.setFileFilter(new JPEGImageFileFilter());
        int res = fc.showOpenDialog(null);
        // We have an image!
        try {
            if (res == JFileChooser.APPROVE_OPTION) {
                File file = fc.getSelectedFile();
                setTarget(file);
            } // Oops!
            else {
                JOptionPane.showMessageDialog(null,
                        "You must select one image to be the reference.", "Aborting...",
                        JOptionPane.WARNING_MESSAGE);
            }
        } catch (Exception iOException) {
        }

    }
}




//JPEGImageFileFilter.Java

package GUI;

import Java.io.File;

import javax.swing.filechooser.FileFilter;

/*
* This class implements a generic file name filter that allows the listing/selection
* of JPEG files.
*/
public class JPEGImageFileFilter extends FileFilter implements Java.io.FileFilter
 {
 public boolean accept(File f)
   {
   if (f.getName().toLowerCase().endsWith(".jpeg")) return true;
   if (f.getName().toLowerCase().endsWith(".jpg")) return true;
   if(f.isDirectory())return true;
   return false;
  }
 public String getDescription()
   {
   return "JPEG files";
   }

}
javaeclipseimageswingjfilechooser
9
user1844951

新しいイメージが選択されるたびに、コンポーネントが不必要に作成され、エラーが発生します。

_public void setTarget(File reference) {
    //....
    panel_1.setLayout(new BorderLayout(0, 0));
    panel_1.add(new JLabel(new ImageIcon(targetImg))); 
    setVisible(true);
_

代わりに、ファイル/画像を選択する前に、これらすべてのコンポーネントを最初から作成し、このメソッドで画像からImageIconを作成し、このアイコンを使用してのアイコンを設定することをお勧めします。新しいJLabelではなく既存のJLabel。これは、myLabel.setIcon(new ImageIcon(targetImg));を呼び出すだけで実行できます。

4
Hovercraft Full Of Eels

ImageViewer.setImage(Image)のようなメソッドでImageViewerを作成し、画像をJLabelに表示します。

ImageViewer

Many (OK 3) images

import Java.awt.*;
import Java.awt.event.*;
import Java.awt.image.BufferedImage;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import Java.util.Random;

public class ImageViewer {

    JPanel gui;
    /** Displays the image. */
    JLabel imageCanvas;

    /** Set the image as icon of the image canvas (display it). */
    public void setImage(Image image) {
        imageCanvas.setIcon(new ImageIcon(image));
    }

    public void initComponents() {
        if (gui==null) { 
            gui = new JPanel(new BorderLayout());
            gui.setBorder(new EmptyBorder(5,5,5,5));
            imageCanvas = new JLabel();

            JPanel imageCenter = new JPanel(new GridBagLayout());
            imageCenter.add(imageCanvas);
            JScrollPane imageScroll = new JScrollPane(imageCenter);
            imageScroll.setPreferredSize(new Dimension(300,100));
            gui.add(imageScroll, BorderLayout.CENTER);
        }
    }

    public Container getGui() {
        initComponents();
        return gui;
    }

    public static Image getRandomImage(Random random) {
        int w = 100 + random.nextInt(400);
        int h = 50 + random.nextInt(200);
        BufferedImage bi = new BufferedImage(
                w,h,BufferedImage.TYPE_INT_RGB);

        return bi;
    }

    public static void main(String[] args) throws Exception {
        Runnable r = new Runnable() {
            @Override
            public void run() {
                JFrame f = new JFrame("Image Viewer");
                // TODO Fix kludge to kill the Timer
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                final ImageViewer viewer = new ImageViewer();
                f.setContentPane(viewer.getGui());

                f.pack();
                f.setLocationByPlatform(true);
                f.setVisible(true);

                ActionListener animate = new ActionListener() {

                    Random random = new Random();

                    @Override
                    public void actionPerformed(ActionEvent arg0) {
                        viewer.setImage(getRandomImage(random));
                    }
                };
                Timer timer = new Timer(1500,animate);
                timer.start();
            }
        };
        SwingUtilities.invokeLater(r);
    }
}
6
Andrew Thompson

私はあなたのコードを変更しました、私はそれがあなたの要件を満たすことを願っています。 MigLayout（レイアウトマネージャー）を使用してコンポーネントを配置します。

import Java.awt.BorderLayout;
import Java.awt.Color;
import Java.awt.Graphics2D;
import Java.awt.event.ActionEvent;
import Java.awt.event.ActionListener;
import Java.awt.image.BufferedImage;
import Java.io.File;
import Java.io.IOException;
import Java.util.logging.Level;
import Java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import net.miginfocom.swing.MigLayout;

public class MyFileChooser
{

JFrame frame; 
JPanel panel;
JButton btnBrowse;
JButton change;
JLabel imglabel;

File targetFile;
BufferedImage targetImg;
private static final int baseSize = 128;
private static final String basePath ="/images/fimage";
JPanel panel_1;
ImageIcon icon;
public MyFileChooser() 
{
    // TODO Auto-generated constructor stub
    frame =new JFrame();
    frame.setLayout(new MigLayout());

    frame.setSize(300, 300);
    frame.setVisible(true);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

     panel=new JPanel(new MigLayout());
     panel_1 = new JPanel();
     panel_1.setBorder(new javax.swing.border.LineBorder(new Java.awt.Color(5, 5, 5), 1, true));

     panel_1.setBackground(Color.pink);

     btnBrowse=new JButton("browse");
     btnBrowse.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            browseButtonActionPerformed(e);
        }
    });

    change=new JButton("Delete");
    change.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent e) 
        {
            // TODO Auto-generated method stub
            changeButtonActionPerformed(e);

        }

        private void changeButtonActionPerformed(ActionEvent e) 
        {
            // TODO Auto-generated method stub

               imglabel.revalidate(); //ADD THIS AS WELL
               imglabel.repaint();  //ADD THIS AS WELL
               imglabel.setIcon(null);
               System.out.println("delete button activated");

        }
    });


    imglabel=new JLabel("Image");
    imglabel.setSize(100, 100);
    imglabel.setBackground(Color.yellow);
    frame.add(panel_1,"span,pushx,pushy,growx,growy");
    frame.add(btnBrowse);
    frame.add(change,"");

    //frame.pack();



}

protected void browseButtonActionPerformed(ActionEvent e) 
{


    JFileChooser fc = new JFileChooser(basePath);
    fc.setFileFilter(new JPEGImageFileFilter());
    int res = fc.showOpenDialog(null);
    // We have an image!
    try {
        if (res == JFileChooser.APPROVE_OPTION) {
            File file = fc.getSelectedFile();
            imglabel.setIcon(null);
           setTarget(file);
        } // Oops!
        else {
            JOptionPane.showMessageDialog(null,
                    "You must select one image to be the reference.", "Aborting...",
                    JOptionPane.WARNING_MESSAGE);
        }
    } catch (Exception iOException) {
    }

}

public BufferedImage rescale(BufferedImage originalImage)
{
    BufferedImage resizedImage = new BufferedImage(baseSize, baseSize, BufferedImage.TYPE_INT_RGB);
    Graphics2D g = resizedImage.createGraphics();
    g.drawImage(originalImage, 0, 0, baseSize, baseSize, null);
    g.dispose();
    return resizedImage;
}
public void setTarget(File reference)
{

    try {
        targetFile = reference;
        targetImg = rescale(ImageIO.read(reference));
    } catch (IOException ex) {
       // Logger.getLogger(MainAppFrame.class.getName()).log(Level.SEVERE, null, ex);
    }

    panel_1.setLayout(new BorderLayout(0, 0));

    icon=new ImageIcon(targetImg);
    imglabel=new JLabel(icon);
    panel_1.add(imglabel); 

    frame.setVisible(true);
}
public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {

        @Override
        public void run() {
            // TODO Auto-generated method stub

            new MyFileChooser();

        }
    });
}

}

JPEGImageFileFilterクラス、このクラスを同じパッケージに保持できます

import Java.io.File;

import javax.swing.filechooser.FileFilter;

public class JPEGImageFileFilter extends FileFilter implements    FileFilter           
{
public boolean accept(File f)
{
  if (f.getName().toLowerCase().endsWith(".jpeg")) return true;
  if (f.getName().toLowerCase().endsWith(".jpg")) return true;
 if(f.isDirectory())return true;
 return false;
}
public String getDescription()
{
  return "JPEG files";
}

}

OUTPUT

0
Sachindra N. Pandey