用JLayeredPane实现在不影响窗口组件布局的情况下，添加一个背景图片：
、
调整窗口大小后：
[java]
package com.han;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Image;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import javax.swing.BorderFactory;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JLayeredPane;
import javax.swing.JPanel;
/**www.2cto.com
* The JLayeredPane has no layout manager by default, so you have to use
* setBounds() for each component in it. However, you can still assign a layout
* manager to the layered pane.
*
* Many programs use intermediate containers (such as panels) and their layout
* managers to lay out components on the same layer, but use absolute
* positioning to lay out components on different layers.
*
* We can use frame.pack() or frame.setSize() whatever its layout method is
* (use a layout manager or not).
*
* In fact, if we hesitate to use component.setPreferredSize() or
* component.setSize(), we first see the layout method employed to layout this
* component. If it has a layout manager, we use component.setPreferredSize();
* else (no layout manager), we use component.setBounds().
*
* Concerning the JLayeredPane, the depth is higher, the component is on
* the top (of course, there are some depth conventions, like DEFAULT_LAYER,
* PALETTE_LAYER, ...). Within its depth, the position number is 0, top-most;
* -1, bottom-most; 0, 1, 2, 3, ... from top to bottom.
*
* @author HAN
*
*/
@SuppressWarnings("serial")
public class JLayeredPane_1 extends JFrame {
public JLayeredPane_1() {
// TODO Auto-generated constructor stub
Container container = getContentPane();
final JLayeredPane layeredPane = new JLayeredPane();
// layeredPane.setBorder(BorderFactory.createTitledBorder(null,
// "layeredPane", TitledBorder.LEADING, TitledBorder.TOP,
// new Font(null, Font.BOLD + Font.ITALIC, 14), Color.RED));
layeredPane.setBorder(BorderFactory.createTitledBorder("<html>" +
"layeredPane" +
"