package com.sot.he.upload;import java.awt.Graphics;import java.awt.Image;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import javax.imageio.ImageIO;import javax.swing.JPanel;/** * 可设置背景图片的JPanel <br> * 提供了三种显示背景图片的方式：居中、平铺和拉伸 *  * @author maxiang */public class PicPanel extends JPanel {    private static final long serialVersionUID = -8251916094895167058L;    private Image image;// 背景图片    /**     * 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;    public PicPanel(String imgPath, int modeIndex) {        this.modeIndex = modeIndex;        try {            image = ImageIO.read(new FileInputStream(imgPath));        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }    /**     * 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 modeType     *            背景图片显示模式     */    public PicPanel(Image image, int modeIndex) {        super();        this.image = image;        this.modeIndex = modeIndex;    }    /**     * 获取背景图片     *      * @return 背景图片     */    public Image getBackgroundImage() {        return image;    }    /**     * 绘制组件     *      * @see javax.swing.JComponent#paintComponent(Graphics)     */    protected void paintComponent(Graphics g) {        super.paintComponent(g);        // 如果设置了背景图片则显示        if (image == null) {            return;        }        int width = this.getWidth();        int height = this.getHeight();        int imageWidth = image.getWidth(this);        int imageHeight = image.getHeight(this);        switch (modeIndex) {        // 居中        case 0: {            int x = (width - imageWidth) / 2;            int y = (height - imageHeight) / 2;            g.drawImage(image, 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(image, ix, iy, this);                }            }            break;        }            // 拉伸        case 2: {            g.drawImage(image, 0, 0, width, height, this);            break;        }        }    }    /**     * 居中     */    public static final int CENTRE = 0;    /**     * 平铺     */    public static final int TILED = 1;    /**     * 拉伸     */    public static final int SCALED = 2;}