java通过JLabel上传背景图像（jpg）后，如何将图像缩放到它所在的面板上？

3 月，3 周 Questions & Answers 35

所以我已经制作了一个包含多个标签、文本字段和按钮的面板。在小组中，我放置了另一个JLabel并转到属性->；图标并上载了一幅图像，但该图像（我正试图用作背景）无法缩放到面板

如何使图像适合缩放面板尺寸？例如，这是一个名为Sample的新项目JFrame，我添加了一个变量名为pnMain的JPanel和一个变量名为lblBackground的JLabel。带着标签，我转到属性->；图标，然后上传了一个图像

package tempo;

public class Sample extends javax.swing.JFrame {

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

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        pnMain = new javax.swing.JPanel();
        lblBackground = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        pnMain.setLayout(null);

        lblBackground.setIcon(new javax.swing.ImageIcon("C:\\Users\\Anderson\\Desktop\\Monkee-Boy Blurred Backgrounds\\bkg-3.jpg")); // NOI18N
        pnMain.add(lblBackground);
        lblBackground.setBounds(0, 0, 400, 280);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(pnMain, javax.swing.GroupLayout.PREFERRED_SIZE, 400, javax.swing.GroupLayout.PREFERRED_SIZE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(pnMain, javax.swing.GroupLayout.PREFERRED_SIZE, 275, javax.swing.GroupLayout.PREFERRED_SIZE)
        );

        pack();
    }                  

    public static void main(String args[]) {
        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(Sample.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Sample.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Sample.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Sample.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Sample().setVisible(true);
            }
        });
    }

    // Variables declaration                     
    private javax.swing.JLabel lblBackground;
    private javax.swing.JPanel pnMain;
    // End of variables declaration                   
}

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java通过JLabel上传背景图像（jpg）后，如何将图像缩放到它所在的面板上？

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