如何在Java Swing中的jframe中添加圖像？

Question

如何添加圖像。 我只想在行上方而不是整個jframe上添加圖像，如何在jframe擺動中做到這一點。 我嘗試過但是我可以在整個screen上設置背景圖像。我只需要在行上方設置背景。

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.Line2D;
import javax.swing.*;
import java.sql.*;
public class Demo1 extends JFrame
{

  public void paint(Graphics g) {
        super.paint(g);  // fixes the immediate problem.
        Graphics2D g2 = (Graphics2D) g;
        Line2D lin = new Line2D.Float(20, 150, 1350, 150);
        g2.draw(lin);
    }       

  public Demo1(  )
  {
      {
      getContentPane().setBackground(new java.awt.Color(240,255,255));
      }     
      this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
      Container c = getContentPane();
      c.setLayout( new FlowLayout() );
      setUndecorated(true);
      Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
      setBounds(0,0,screenSize.width, screenSize.height); 
 }

  public static void main( String[] args )
  {
      Demo1 frame = new Demo1();
      frame.setVisible(true);
  }
}

Answer 1

為了添加圖像，您可以在paint()函數中使用g.drawImage(Image img, int x, int y, ImageObserver observer) 。

要么

制作一個JLabel並向其中添加圖像圖標

Answer 2

//全球宣言

private BufferedImage bi;

//某處

try {
        bi = ImageIO.read(new File("C:/1.jpg"));//Write path of your image here
    } catch (IOException ex) {
        Logger.getLogger(ClassName.class.getName()).log(Level.SEVERE, null, ex);//Change ClassName to your class Name
    }


    final JPanel panel = new JPanel(){
        @Override
        protected void paintComponent(Graphics g){
            Graphics g2 = g.create();
            g2.drawImage(bi, 0, 0, getWidth(), getHeight(), null);
            g2.dispose();
        }

        @Override
        public Dimension getPreferredSize(){
            return new Dimension(bi.getWidth()/2, bi.getHeight()/2);
        }
    };

    mainPanel.add(panel, BorderLayout.CENTER);
    //Add other components to mainPanel
    frm.add(mainPanel);

Answer 3

class MyImagePanel extends JPanel{ 
    BufferedImage image;
    public void paintComponent(Graphics g){
        super.paintComponent(g);
        if(image != null){
            g.drawImage(image, 0, 0, this);
        }
    }
}