import java.awt.Graphics;
import java.awt.Image;

import javax.swing.JPanel;

/**
 * 可设置背景图片的JPanel，提供了三种显示背景图片的方式：居中、平铺和拉伸。
 * 未设置背景图片的情况下，同JPanel。
 * 
 * @author 003
 */
public class JImagePane extends JPanel
{
    private static final long serialVersionUID = -8251916094895167058L;
    
    /**
     * 居中
     */
    public static final String CENTRE = "Centre";
    
    /**
     * 平铺
     */
    public static final String TILED = "Tiled";

    /**
     * 拉伸
     */
    public static final String SCALED = "Scaled";

    /**
     * 背景图片
     */
    private Image backgroundImage;
    
    /**
     * 背景图片显示模式
     */
    private String imageDisplayMode;

    /**
     * 背景图片显示模式索引（引入此属性有助于必要时扩展）
     */
    private int modeIndex;

    /**
     * 构造一个没有背景图片的JImagePane
     */
    public JImagePane()
    {
        this(null, CENTRE);
    }
    
    /**
     * 构造一个具有指定背景图片和指定显示模式的JImagePane
     * @param image 背景图片
     * @param modeName 背景图片显示模式
     */
    public JImagePane(Image image, String modeName)
    {
        super();
        setBackgroundImage(image);
        setImageDisplayMode(modeName);
    }
    
    /**
     * 设置背景图片
     * @param image 背景图片
     */
    public void setBackgroundImage(Image image)
    {
        this.backgroundImage = image;
        this.repaint();
    }

    /**
     * 获取背景图片
     * @return 背景图片
     */
    public Image getBackgroundImage()
    {
        return backgroundImage;
    }

    /**
     * 设置背景图片显示模式
     * @param modeName 模式名称，取值仅限于ImagePane.TILED  ImagePane.SCALED  ImagePane.CENTRE
     */
    public void setImageDisplayMode(String modeName)
    {
        if(modeName != null)
        {
            modeName = modeName.trim();
            
            //居中
            if(modeName.equalsIgnoreCase(CENTRE))
            {
                this.imageDisplayMode = CENTRE;
                modeIndex = 0;
            }
            //平铺
            else if(modeName.equalsIgnoreCase(TILED))
            {
                this.imageDisplayMode = TILED;
                modeIndex = 1;
            }
            //拉伸
            else if(modeName.equalsIgnoreCase(SCALED))
            {
                this.imageDisplayMode = SCALED;
                modeIndex = 2;
            }
            
            this.repaint();
        }
    }

    /**
     * 获取背景图片显示模式
     * @return 显示模式
     */
    public String getImageDisplayMode()
    {
        return imageDisplayMode;
    }

    /**
     * 绘制组件
     * @see javax.swing.JComponent#paintComponent(Graphics)
     */
    @Override
    protected void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        
        //如果设置了背景图片则显示
        if(backgroundImage != null)
        {
            int width = this.getWidth();
            int height = this.getHeight();
            int imageWidth = backgroundImage.getWidth(this);
            int imageHeight = backgroundImage.getHeight(this);

            switch(modeIndex)
            {
                //居中
                case 0:
                {
                    int x = (width - imageWidth) / 2;
                    int y = (height - imageHeight) / 2;
                    g.drawImage(backgroundImage, x, y, this);
                    break;
                }
                //平铺
                case 1:
                {
                    for(int ix = 0; ix < width; ix += imageWidth)
                    {
                        for(int iy = 0; iy < height; iy += imageHeight)
                        {
                            g.drawImage(backgroundImage, ix, iy, this);
                        }
                    }
                    
                    break;
                }
                //拉伸
                case 2:
                {
                    g.drawImage(backgroundImage, 0, 0, width, height, this);
                    break;
                }
            }
        }
    }
}

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;

import javax.swing.JPanel;

import mmlab.image.Rectangle;


/**
 * Custom Jpanel
 *
 * @author Andy Yang
 */
public class FaceLabel extends JPanel {
    private static final long serialVersionUID = 39082560987930759L;
    private boolean state = false;
    private Rectangle rectangle = null;
    private Image image = null;

    /** 记录鼠标是否进入控件 */
    private boolean hover;
    private String personName = null;
    private double photoScaled = 1.0;

    /**
     * 无参构造方法
     */
    public FaceLabel() {
    }

    /**
     * 带有Color的构造方法
     *
     * @param color
     *            背景颜色
     */
    public FaceLabel(Image image) {
        this.image = image;

        // 定义图像尺寸
        Dimension size = new Dimension(this.image.getWidth(null),
                this.image.getHeight(null));
        setPreferredSize(size);
        setMinimumSize(size);
        setMaximumSize(size);
        setSize(size);
        setBackground(new Color(112, 112, 112));
        // 定义布局方式为空
        setLayout(null);
    }

    /**
     * 重写基类的无参构造方法
     */
    @Override
    protected void paintComponent(Graphics g) {
        setOpaque(true);
        super.paintComponent(g);

        Graphics2D g2d = (Graphics2D) g.create();
        g2d.drawImage(this.getImage(), 0, 0, null);

        if (isState() && (getRectangle() != null)) {
            // JOptionPane.showMessageDialog(null,getPhotoScaled());
            Rectangle rect = getRectangle();
            int x = rect.x;
            int y = rect.y;
            int width = rect.width;
            int height = rect.height;

            if (getPhotoScaled() == 1.0) {
                g2d.setColor(new Color(255, 0, 0));
                g2d.drawRect(x, y, width, height);
                //  g2d.draw3DRect(x,y,width,height,true);
                g2d.setColor(new Color(255, 255, 0));
                g2d.drawString(this.getPersonName(), x, y - 5);
            } else {
                String sX = String.valueOf(Math.ceil(
                            (double) rect.x / photoScaled));
                String sY = String.valueOf(Math.ceil(
                            (double) rect.y / photoScaled));
                String sW = String.valueOf(Math.ceil(
                            (double) rect.width / photoScaled));
                String sH = String.valueOf(Math.ceil(
                            (double) rect.height / photoScaled));
                int indexX = sX.indexOf(".");
                int indexY = sY.indexOf(".");
                int indexW = sW.indexOf(".");
                int indexH = sH.indexOf(".");
                x = Integer.parseInt(sX.substring(0, indexX));
                y = Integer.parseInt(sY.substring(0, indexY));
                width = Integer.parseInt(sW.substring(0, indexW));
                height = Integer.parseInt(sH.substring(0, indexH));
                g2d.setColor(new Color(255, 0, 0));
                g2d.drawRect(x, y, width, height);
                //  g2d.draw3DRect(x,y,width,height,true);
                g2d.setColor(new Color(0, 0, 255));
                g2d.drawString(this.getPersonName(), x, y - 5);
            }
        }
    }

    public boolean isState() {
        return state;
    }

    public void setState(boolean state) {
        this.state = state;
    }

    public Rectangle getRectangle() {
        return rectangle;
    }

    public void setRectangle(Rectangle rectangle) {
        this.rectangle = rectangle;
    }

    public Image getImage() {
        return image;
    }

    public void setImage(Image image) {
        this.image = image;
    }

    public String getPersonName() {
        return (personName == null) ? "null" : personName;
    }

    public void setPersonName(String personName) {
        this.personName = personName;
    }

    public double getPhotoScaled() {
        return photoScaled;
    }

    public void setPhotoScaled(double photoScaled) {
        this.photoScaled = photoScaled;
    }
}
//这是我项目中用到的一个控件.你自己试着去改一下吧.

//关键代码是：

    /**
     * 重写基类的无参构造方法
     */
    @Override
    protected void paintComponent(Graphics g) {
        setOpaque(true);
        super.paintComponent(g);

        Graphics2D g2d = (Graphics2D) g.create();
        g2d.drawImage(this.getImage(), 0, 0, null);

    }

JImagePane panel = new JImagePane(new ImageIcon("003.png").getImage(), JImagePane.SCALED);
//或者
JImagePane panel = new JImagePane();
panel.setBackgroundImage(new ImageIcon("003.png").getImage());
panel.setImageDisplayMode(JImagePane.SCALED);

public class MyPanel extends JPanel {
        // 定义图像的引用
        Image bgImage;

        // 步骤 1
        public MyPanel() {
                bgImage = new ImageIcon("..../bg.png").getImage(); // 创建图像对象.
        }

        // 步骤 2
        protected void paintComponent(Graphics g) {
                super.paintComponent(g);

                if (bgImage != null) {
                        g.drawImage(bgImage, 0, 0, this.getWidgth(), this.getHeight(), null);
                }
        }

}