java添加背景图片

JPANEL 类 ， 重写 paintCompontent 类，在paintCompontent()方法中添加图片

 

 

class Welcome extends JPanel{

    private static final long serialVersionUID = 1L;

    intwidth=0, height=0;

   Welcome(int x, int y, int width, int height){

        this.width= width;

       this.height = height;

       this.setBounds(x, y, width, height);

}

 

@Override

public void paintComponent(Graphics g){

   Graphics2D g2d = (Graphics2D) g;

   ImageIcon icon = null;

    try{

       icon = new ImageIcon("filepath\\filename");

    } catch(Exception e) {

       // TODO Auto-generated catch block

       e.printStackTrace();

    }

   g2d.drawImage(icon.getImage(), 0, 0,this.getSize().width,this.getSize().height, this);

   g2d.setColor(new Color(150, 150, 180));

   g2d.drawRect(0, 0, width-1, height-1);

   g2d.setColor(Color.RED);

   g2d.setFont(g.getFont().deriveFont(Font.BOLD|Font.ITALIC,28f));

   g2d.drawString("演示", 230, 60);

   g2d.setFont(g.getFont().deriveFont(Font.BOLD|Font.ITALIC,22f));

   g2d.drawString("WINLAB", 600, 90);

   //改变颜色和字体

   g2d.setColor(Color.BLUE);

   g2d.drawLine(590, 92, 690, 92);

  }

}