使用JPanel和按钮在GUI中显示图像

Question

我正在制作一个项目，当您点击按钮时，图片会显示在JPanel中。

但是当我点击那个按钮时，没有任何反应。

如何修复此代码？

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    // button sluiten van de deur
     try {
           writer.println("execute(lock, \"aepu04:SI-Test\");");
           writer.flush(); // flushes the buffer

            String path = "http://chart.finance.yahoo.com/z?s=GOOG&t=6m&q=l";
            System.out.println("Get Image from " + path);
            URL url = new URL(path);
            BufferedImage image = ImageIO.read(url);
            System.out.println("Load image into frame...");
            JLabel label = new JLabel(new ImageIcon(image));
            JPanel panel = jPanel1;
            panel.add(label);

            panel.setVisible(true);
        } catch (Exception ex) {
            chatTextArea.append("Message was not sent. \n");
        }