public class Global{
   // 图片目录URL
    public static final String RESOURCE_DIR = "resource/";

   //配置文件名
    public static final String IMAGE_ICON = "icon.gif";
    private static Map imagesMap = new HashMap();

    public static Image getImage(String name) {
        Object o = imagesMap.get(name);
        if (o != null) {
            return (Image) o;
        } else {
            String imagePath = RESOURCE_DIR + name;
            InputStream is = Global.class.getResourceAsStream(imagePath);
            ByteArrayOutputStream  baos = new ByteArrayOutputStream();
            int c;
            try {
                while ((c = is.read()) >= 0) {
                    baos.write;
                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            Image image = Toolkit.getDefaultToolkit().createImage(baos.toByteArray());
            imagesMap.put(name,image);
            return image;
        }
    }
}