Question

我正在尝试在ArrayList中加载一组图像，但只查看最后一张图片。第一个在面板上看不到。任何信息？我们的想法是它们按顺序出现在JPanel中。

感谢。

   /*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package cargaimagenes;

import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.ImageObserver;
import java.awt.image.ImageProducer;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JLabel;

/**
 *
 * @author ZOUHIR
 */
public class PanelCarga extends javax.swing.JFrame {

    /**
     * Creates new form PanelCarga
     */
    private List<Image> Imagenes = new ArrayList<Image>();
    private JLabel eq = new JLabel();
    private Image imagen = new Image() {

        @Override
        public int getWidth(ImageObserver observer) {
            throw new UnsupportedOperationException("Not supported yet.");
        }

        @Override
        public int getHeight(ImageObserver observer) {
            throw new UnsupportedOperationException("Not supported yet.");
        }

        @Override
        public ImageProducer getSource() {
            throw new UnsupportedOperationException("Not supported yet.");
        }

        @Override
        public Graphics getGraphics() {
            throw new UnsupportedOperationException("Not supported yet.");
        }

        @Override
        public Object getProperty(String name, ImageObserver observer) {
            throw new UnsupportedOperationException("Not supported yet.");
        }
    };


    public PanelCarga() {
        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() {

        PanelP = new javax.swing.JPanel();
        lPrincipal = new javax.swing.JLabel();
        jButton1 = new javax.swing.JButton();
        jToggleButton1 = new javax.swing.JToggleButton();
        jButton2 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        PanelP.setBorder(new javax.swing.border.LineBorder(new java.awt.Color(0, 0, 0), 1, true));

        javax.swing.GroupLayout PanelPLayout = new javax.swing.GroupLayout(PanelP);
        PanelP.setLayout(PanelPLayout);
        PanelPLayout.setHorizontalGroup(
            PanelPLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 484, Short.MAX_VALUE)
        );
        PanelPLayout.setVerticalGroup(
            PanelPLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 435, Short.MAX_VALUE)
        );

        jButton1.setText("Mostrar");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jToggleButton1.setText("Salir");
        jToggleButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jToggleButton1ActionPerformed(evt);
            }
        });

        jButton2.setText("Recorrer");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(43, 43, 43)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addComponent(PanelP, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(lPrincipal, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addGap(27, 27, 27)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addComponent(jButton1, javax.swing.GroupLayout.DEFAULT_SIZE, 93, Short.MAX_VALUE)
                    .addComponent(jToggleButton1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jButton2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addContainerGap(42, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(51, 51, 51)
                        .addComponent(PanelP, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(66, 66, 66)
                        .addComponent(jButton1)
                        .addGap(18, 18, 18)
                        .addComponent(jToggleButton1)
                        .addGap(18, 18, 18)
                        .addComponent(jButton2)))
                .addGap(18, 18, 18)
                .addComponent(lPrincipal, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(34, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                        

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        // la idea es cuando se pulse el boton se cargue en el panel las imagenes del directorio indicado en el path.

        String nombre,ruta = "C:/Users/ZOUHIR/Documents/Secuencia_imagenes/videofsom/frames/";
        try {
            File f = new File(ruta);
            File[] ficheros = f.listFiles();

            if (!f.exists()) {
                System.out.println("No Existe el Directorio");
                this.lPrincipal.setText("no existe Directorio");

            } else {

                // creo una coleccion de imagenes.
                for (int i = 0; i < ficheros.length; i++) {
                    //leo la imagen del fichero.

                    imagen = ImageIO.read(ficheros[0]);
                    //imprimo el nombre para ver cual se esta leyendo.
                    nombre = ficheros[0].getName();
                    //BufferedImage buffered = (BufferedImage) imagen;
                    System.out.println(nombre);
                    //añado la imagen a la coleccion 
                    Imagenes.add(imagen);
                    System.out.println("acabo de añadir a la coleccion la imagen "+0);
                    System.out.println("el numero de elementos de la coleccion "+ Imagenes.size());
                    //llamo al metodo que muesta la imagen en el panel. 
                    // mostrarImagenes(Imagenes.get(i), nombre,i);
                   //this.esperar(5);
              }
                System.out.println("Imagenes del bucle cargadas en la coleccion-->salgo del bucle");


            }

        } catch (Exception ex) {
        }

    }                                        
    public void esperar(int segundos) {
        try {
            Thread.sleep(segundos * 1000);
        } catch (Exception e) {
// Mensaje en caso de que falle
        }
    }

    private void jToggleButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                               


        System.exit(0);
    }                                              

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // el evento relacionado con este boton es recorrer la coleccion.
        System.out.println("tenemos antes de entrar en el bucle del recorrido");
        for(int i=0;i<Imagenes.size();++i){
            // recorro la coleccion entera
            this.PanelP.setVisible(true);
            this.mostrarImagenes(Imagenes.get(i),null , i);
            this.esperar(5);
        }
        System.out.println("Finalizo el recorrido a toda la colecicon-->Deben aparecer laa imagenes en el panel");

    }                                        

    public void mostrarImagenes(Image img, String nombre,int indice) {
        // en este metodo muestro los elementos en el panel
        //hago visible la etiqueta.

        eq.setVisible(true);
        Icon icono = new ImageIcon(img);
        eq.setSize(200, 200);
        eq.setIcon(icono);
        System.out.println("He creado el icono de "+nombre + indice);
        this.PanelP.setVisible(true);
        this.PanelP.add(eq);
        this.lPrincipal.setText("Cargando Imagen:" + nombre);

    } 

    /**
     * @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(PanelCarga.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(PanelCarga.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(PanelCarga.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(PanelCarga.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 PanelCarga().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                     
    private javax.swing.JPanel PanelP;
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JToggleButton jToggleButton1;
    private javax.swing.JLabel lPrincipal;
    // End of variables declaration                   



}

谢谢

Answer 1

这是错误：

            for (int i = 0; i < ficheros.length; i++) {
                //leo la imagen del fichero.

                imagen = ImageIO.read(ficheros[0]);

您始终只是阅读相同的图片，而不是i。

相反它应该是这样的：

            for (int i = 0; i < ficheros.length; i++) {
                //leo la imagen del fichero.

                imagen = ImageIO.read(ficheros[i]);

然而，迭代数组和集合的更好方法是：

           for (String imageName : ficheros) {
                imagen = ImageIO.read(imageName);
                ...
           }

这种方法不仅更容易阅读，而且你绝对可以避免上述错误。

在Jpanel Java上加载ArrayList <img/>

1 个答案: