在NetBeans中向JPanel添加图像

Question

我是java swing的新手，现在我使用NetBeant使用NetBeans中内置的拖放设计器构建GUI。我现在面临的问题是，我有下面发布的代码，它是在Eclipse中编写的，正如您所看到的，我有一个扩展JPanel的类，我将从WEB_CAM捕获的图像添加到该JPanel中。现在，自从我切换到NetBeans，我使用设计器创建了JFrame、JPanel和JButtons，在我用NetBeans编写的代码中，我不知道如何将捕获的图像添加到JPanel中。

在html" target="_blank">eclipse中，我在另一个类中创建了下面发布的代码，但在NetBeans中，所有东西都是自动生成的，我必须做与在eclipse中相同的工作。我不知道如何在NetBeans中向JPanel添加图像。

JPanel inEclipse

class FacePanel extends JPanel {
private BufferedImage image;
int count = 0;

public FacePanel() {
    super();
}

public void setFace (BufferedImage img) {
    this.image = img;
}

public void paintComponent(Graphics g) {
    super.paintComponent(g);

    if (this.image == null) {
        System.out.println("image is null");
        return;
    }

    g.drawImage(this.image, 10, 10, this.image.getWidth(), this.image.getHeight(), null);
    g.setFont(new Font("arial", 2, 20));
    g.setColor(Color.WHITE);
    g.drawString("processing frame by frame [ frame: " + ( count++) +  " ]", 150, 150);
}

}

NetBeans中的代码

    private void initComponents() {

    jpanel1_Preview = new javax.swing.JPanel();
    btn_Play = new javax.swing.JButton();
    btn_Pause = new javax.swing.JButton();
    btn_Capture = new javax.swing.JButton();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jpanel1_Preview.setBorder(javax.swing.BorderFactory.createTitledBorder("Cam_Preview"));

    javax.swing.GroupLayout jpanel1_PreviewLayout = new javax.swing.GroupLayout(jpanel1_Preview);
    jpanel1_Preview.setLayout(jpanel1_PreviewLayout);
    jpanel1_PreviewLayout.setHorizontalGroup(
        jpanel1_PreviewLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 0, Short.MAX_VALUE)
    );
    jpanel1_PreviewLayout.setVerticalGroup(
        jpanel1_PreviewLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 225, Short.MAX_VALUE)
    );

    btn_Play.setText("play");
    btn_Play.setSelected(true);

    btn_Pause.setText("pause");
    btn_Pause.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            btn_PauseActionPerformed(evt);
        }
    });

    btn_Capture.setText("capture");
    btn_Capture.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            btn_CaptureActionPerformed(evt);
        }
    });

Answer 1

1. 将类FacePanel extends JPanel{更改为公共类FacePanel extends JPanel{，否则Netbeans将无法创建它的实例。
2. 做一个“清洁和建设”
3. 将FacePanel类从项目资源管理器拖到窗体上...