JFrame如何设置背景图片

import java.awt.FlowLayout;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import javax.imageio.ImageIO;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import net.coobird.thumbnailator.Thumbnails;

import net.coobird.thumbnailator.geometry.Positions;

public class BackGroundSetting

{

    private JFrame frame = new JFrame("背景图片测试");

    

    private JPanel imagePanel ;

    

    private ImageIcon background;

    

    public static void main(String[] args)

    {

        new BackGroundSetting();

    }

    

    public BackGroundSetting()

    {

    BufferedImage image=null;

//     try {

//    

// image=Thumbnails.of("E:\\1.jpg")   

// .size(600, 500)  

// .watermark(Positions.BOTTOM_CENTER, ImageIO.read(new File("E:\\360Downloads\\loopwallpaper\\1.jpg")), 0.7f)   

// .outputQuality(0.8f)

// .asBufferedImage();

// //.toFile("c:/a380_watermark_bottom_right.jpg");

// } catch (IOException e) {

// // TODO Auto-generated catch block

// e.printStackTrace();

// }  

//  

    try {

image=ImageIO.read(new File("E:\\360Downloads\\loopwallpaper\\1.jpg"));

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

        background = new ImageIcon(image);//背景图片

        JLabel label = new JLabel(background);//把背景图片显示在一个标签里面

//     把标签的大小位置设置为图片刚好填充整个面板

        label.setBounds(0,0,background.getIconWidth(),background.getIconHeight());

//     把内容窗格转化为JPanel，否则不能用方法setOpaque()来使内容窗格透明       

        imagePanel = (JPanel)frame.getContentPane();

        imagePanel.setOpaque(false);

//     内容窗格默认的布局管理器为BorderLayout

        imagePanel.setLayout(new FlowLayout());

        imagePanel.add(new JButton("测试按钮"));

        

        frame.getLayeredPane().setLayout(null);

//     把背景图片添加到分层窗格的最底层作为背景       

        frame.getLayeredPane().add(label,new Integer(Integer.MIN_VALUE));    

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.setSize(background.getIconWidth(),background.getIconHeight());

        

        frame.setVisible(true);

    }

}