JAVA 界面设计怎么插入背景图片？

JPanel jp=new JPanel()://定义面板并初始化

Icon iocn=new ImageIcon("C:/My Documents/tupian.jpg")//定义图片并初始化，写上图片的绝对路径

JLabel jl=new JLabel(icon)://把图片放在标签上

jp.add(jl)//往面板上添加标签注意：面板JPanel不能之间添加图片iocn，icon需要放在标签JLabel上，才能在JPanel上显示

import java.awt.event.*

import javax.swing.*

public class MainJFrame extends JFrame{

private ImageJPanel ip

public MainJFrame() {

initial()

}

public void initial()

{

ip=new ImageJPanel()

this.setTitle("Demo")

this.setSize(400,300)

this.setResizable(false)

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)

this.setLocationRelativeTo(this)

Container c=this.getContentPane()

c.setLayout(null)

ip.setBounds(0,0,this.getWidth(),this.getHeight())

c.add(ip)

this.setVisible(true)

}

public static void main(String[] args)

{

new MainJFrame()

}

}

class ImageJPanel extends JPanel

{

private ImageIcon ii

public ImageJPanel()

{

//bk.jpg是指背景图片的名称 ii=new ImageIcon("bk.jpg")

}

//绘制背景图片 public void paintComponent(Graphics g)

{

super.paintComponent(g)

g.drawImage(ii.getImage(),0,0,this)

}

}

JPanel p=new JPanel()

JLabel l=new JLabel()

Icon icon=new ImageIcon("D:\\rk01.jpg")//在此直接创建对象

l.setIcon(icon)

l.setBounds(0, 0, icon.getIconWidth(),icon.getIconHeight())

p.add(l,new Integer(Integer.MIN_VALUE))

这样可以给panel加一个背景图

      //重写JPanel的这个方法就可以了

       @Override  

    public void paintComponent(Graphics gs) {  

        Graphics2D g = (Graphics2D) gs  

        super.paintComponent(g)  

        //画背景图片  

        Image image = Toolkit.getDefaultToolkit().getImage(getClass().getResource(imgPath))  

        g.drawImage(image, 0, 0,width,height, this)  

    }

一个完整的代码:

package test

import java.awt.Graphics

import java.awt.Image

import java.net.URL

import javax.swing.ImageIcon

import javax.swing.JFrame

import javax.swing.JPanel

//为窗口添加背景图片

public class JFrameBackground {

private JFrame frame = new JFrame("带背景图片的JFrame")

private JPanel imagePanel

private ImageIcon backgroundimg

public JFrameBackground() {

imagePanel = new JPanel() {

@Override

protected void paintComponent(Graphics g) {

super.paintComponent(g)

URL location = this.getClass().getResource("grapes.gif")

backgroundimg = new ImageIcon(location)

Image img = backgroundimg.getImage()

g.drawImage(img, 0, 0, backgroundimg.getIconWidth(),

backgroundimg.getIconHeight(),

backgroundimg.getImageObserver())

frame.setSize(backgroundimg.getIconWidth(),

backgroundimg.getIconHeight())

}

}

frame.add(imagePanel)

frame.setVisible(true)

frame.pack()

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)

}

public static void main(String[] args) {

new JFrameBackground()

}

}

这是运行的一个截图:

参考网址: 

http://www.linuxidc.com/Linux/2011-08/41689.htm 两种设置背景的方法

http://blog.csdn.net/one_and_only4711/article/details/6594770 动态改变背景大小

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