Obrazek

package otwieraniezdjec;

import java.awt.Graphics;
import java.awt.Image;
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.JFileChooser;


/**
 *
 * @author P42
 */
public class Obrazki extends javax.swing.JFrame {

    /**
     * Creates new form NewJFrame
     */
    public Obrazki() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        otworz = new javax.swing.JButton();
        nazwaPliku = new javax.swing.JLabel();
        tablica = new javax.swing.JPanel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        otworz.setText("Otwórz");
        otworz.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                otworzActionPerformed(evt);
            }
        });

        nazwaPliku.setText("jLabel1");

        tablica.setBackground(new java.awt.Color(0, 0, 0));

        javax.swing.GroupLayout tablicaLayout = new javax.swing.GroupLayout(tablica);
        tablica.setLayout(tablicaLayout);
        tablicaLayout.setHorizontalGroup(
            tablicaLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 0, Short.MAX_VALUE)
        );
        tablicaLayout.setVerticalGroup(
            tablicaLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 260, Short.MAX_VALUE)
        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(otworz)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(nazwaPliku)
                .addGap(0, 289, Short.MAX_VALUE))
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(tablica, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(otworz)
                    .addComponent(nazwaPliku))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(tablica, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        );

        pack();
    }// </editor-fold>
    Image obrazek=null;
    @Override
    public void paint(Graphics g) {
        super.paint(g);
        if(obrazek==null) {
            return;


        }
        scaleImageIfNeeded();
        Graphics tablicaG = tablica.getGraphics();
        tablicaG.drawImage(obrazek, 0, 0, this);
    }
    private void scaleImageIfNeeded() {
                if ((obrazek == null) || (obrazek.getWidth(null) != getWidth()) || (obrazek.getHeight(null) != getHeight())) {
                        obrazek = obrazek.getScaledInstance(getWidth(), getHeight(), Image.SCALE_DEFAULT);
                }
        }
    private void otworzActionPerformed(java.awt.event.ActionEvent evt) {

                   JFileChooser oknoOtwierania = new JFileChooser();
                   int sposobZamkniecia = oknoOtwierania.showOpenDialog(this);
                   if (sposobZamkniecia != JFileChooser.APPROVE_OPTION) {
                       return;
                   }

                   File wybranyPlik = oknoOtwierania.getSelectedFile();
                   nazwaPliku.setText( wybranyPlik.getName());
        try {
            obrazek = ImageIO.read(wybranyPlik);
            Graphics g = tablica.getGraphics();
            g.drawImage(obrazek, 0, 0, this);
        } catch (Exception ex) {
            nazwaPliku.setText("Błąd otwierania pliku kmiocie!");

        }

    }

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /*
         * Set the Nimbus look and feel
         */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /*
         * If Nimbus (introduced in Java SE 6) is not available, stay with the
         * default look and feel. For details see
         * http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Obrazki.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Obrazki.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Obrazki.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Obrazki.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /*
         * Create and display the form
         */
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new Obrazki().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JLabel nazwaPliku;
    private javax.swing.JButton otworz;
    private javax.swing.JPanel tablica;
    // End of variables declaration
}