JPanel上设置背景图片

import java.awt.*;import javax.swing.*;public class ImageJPanel extends JPanel{private Image image;public ImageJPanel(Image image){ //首先构建一个构造方法.传入的参数是Image的文件路径  this.image=image;  Dimension size = new Dimension(image.getWidth(null),            image.getHeight(null));  setSize(size);  //设置JPanel的大小为Image图象的大小  setPreferredSize(size);  setMaximumSize(size);  setMinimumSize(size);}protected void paintComponent(Graphics g) {  super.paintComponent(g);  g.drawImage(image,0,0,null); //用G 把Image画出来 }public static void main(String[]args){  ImageJPanel imageJP = new ImageJPanel(new ImageIcon("Image/***.jpg").getImage());  JFrame jf = new JFrame();  jf.add(imageJP);  jf.setSize(imageJP.getWidth(),imageJP.getHeight()+35);//这里+35 是因为JFrame上会有个标题栏 他会占35像素  jf.setVisible(true);}}