JAVA在JFrame中加背景图片

方法1：

import java.awt.Container;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Test extends JFrame {

public Test() {
setBak(); //调用背景方法
Container c = getContentPane(); //获取JFrame面板
JPanel jp = new JPanel(); //创建个JPanel
jp.setOpaque(false); //把JPanel设置为透明 这样就不会遮住后面的背景 这样你就能在JPanel随意加组件了
c.add(jp);
setSize(540, 450);
setVisible(true);
}
public void setBak(){
((JPanel)this.getContentPane()).setOpaque(false);
ImageIcon img = new ImageIcon(“c://Sunset.jpg”);
JLabel background = new JLabel(img);this.getLayeredPane().add(background, new Integer(Integer.MIN_VALUE));
background.setBounds(0, 0, img.getIconWidth(), img.getIconHeight());
}

public static void main(String[] args) {
Test s = new Test();
s.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

}
======================================
方法2：

要在JPanel中显示图片
可以将一JLabel控件加入其中，在JLabel中添加图片，如：
JLabel lb = new JLabel(new ImageIcon(“.\\xxx\\xx.jpg”));
jPanel1.add(lb);
应该可以，不知是否会答非所问？

package baidu.zhidao;

import java.awt.BorderLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
/**
* 如何在JPanel中显示图片
* @author jink2005
*
*/

public class ImagePane extends JPanel
{
JLabel jl = null;
ImageIcon img = null;
/**
* @param args
*/
public ImagePane()
{
img = new ImageIcon(“E:\\eclipse\\workspace\\Study\\baidu\\zhidao\\horse.jpg”);
jl = new JLabel(img);
this.setLayout(new BorderLayout());
this.add(jl, BorderLayout.CENTER);
}
public static void main(String[] args)
{
JFrame test = new JFrame(“Image Pane”);
test.getContentPane().add(new ImagePane());
test.pack();
test.setVisible(true);
test.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
}
}
======================================
方法3：
JPanel中加进背景图片
import java.awt.Dimension;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.ImageIcon;

import java.awt.BorderLayout;
import java.awt.Graphics;
public class Frame1 extends JFrame {
JPanel contentPane;
BorderLayout borderLayout1 = new BorderLayout();
ImageIcon image=new ImageIcon(Frame1.class.getResource(
“a.jpg”));
Panel1 jp=new Panel1(image);
public Frame1() {
try {
setDefaultCloseOperation(EXIT_ON_CLOSE);
jbInit();
} catch (Exception exception) {
exception.printStackTrace();
}
}

/**
* Component initialization.
*
* @throws java.lang.Exception
*/
private void jbInit() throws Exception {
contentPane = (JPanel) getContentPane();
contentPane.setLayout(borderLayout1);
contentPane.add(jp);
setSize(new Dimension(400, 300));
setTitle(“Frame Title”);
}
}
class Panel1 extends JPanel {
BorderLayout borderLayout1 = new BorderLayout();
private ImageIcon image = null;
public Panel1(ImageIcon image) {
try {
this.image = image;
jbInit();
} catch (Exception exception) {
exception.printStackTrace();
}
}

private void jbInit() throws Exception {
this.setLayout(borderLayout1);
}
protected void paintComponent(Graphics g) {
setOpaque(true);
super.paintComponent(g);
Dimension d = getSize();
for( int x = 0; x < d.width; x += image.getIconWidth() )
for( int y = 0; y < d.height; y += image.getIconHeight() )
g.drawImage( image.getImage(), x, y, null, null );
}
}