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下面的代码应该从数据库中检索图像并将其显示在 jlabel 中。经过大量尝试，我无法显示图像。在下面的代码中，我首先连接到 JavaDB，它是一个简单的表，只有一个包含图像的记录。然后我检索该记录并将其存储在现有客户对象中。然后我解码字节数组并将数组设置为 ImageIcon，然后将图标设置为标签。我遇到的问题是输出确认字节数组已存储在图标中，但它不会显示在标签中。请帮忙

 private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {

    try {
        Customer existingCustomer = new Customer();
        String dbURL = "jdbc:derby://localhost:1527/CustDB";
        String uname = "mydb";
        String upass = "mydb";


            //Get a connection
            Class.forName("org.apache.derby.jdbc.ClientDriver").newInstance();
            Connection conn = DriverManager.getConnection(dbURL, uname, upass); 
            System.out.println("Connection OK"); 
            Statement stmt = conn.createStatement();
            ResultSet results = stmt.executeQuery(
            "select photo from APP.CUSTOMER where CUSTOMER_ID = 2");

            while(results.next())
            {
                existingCustomer.setPhoto(results.getBytes(1));                    
            }
            results.close();
            stmt.close();

            byte[] imageData = Base64.base64Decode(existingCustomer.getPhoto());

        System.out.println(imageData);


        if(imageData !=  null)
         {System.out.println("yes");}else{System.out.println("no");}
           ImageIcon icon = new ImageIcon(imageData);
           //BufferedImage image = ImageIO.read(new ByteArrayInputStream(imageData));
        if(icon != null){System.out.println("yes");}else{System.out.println("no");}

           jLabelImage.setText(null);
           jLabelImage.setIcon(icon);

    } catch (SQLException ex) {
        Logger.getLogger(custform.class.getName()).log(Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        Logger.getLogger(custform.class.getName()).log(Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        Logger.getLogger(custform.class.getName()).log(Level.SEVERE, null, ex);
    } catch (ClassNotFoundException ex) {
        Logger.getLogger(custform.class.getName()).log(Level.SEVERE, null, ex);
    }
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