JFace ImageRegistry 封装，遍历目录，实现自动注册

背景：

SWT的图像创建是重要级的，需要释放资源

JFace封装了ImageRegistry以提供资源自动动释放功能，一般这样做：http://www.java2s.com/Code/Java/SWT-JFace-Eclipse/ImageRegistryDemo.htm

import org.eclipse.jface.resource.*;import org.eclipse.jface.window.ApplicationWindow;import org.eclipse.swt.SWT;import org.eclipse.swt.layout.*;import org.eclipse.swt.widgets.*;/** * This class tests ImageRegistry */public class ImageRegistryTest extends ApplicationWindow {  // Keys for the registry  private static final String ONE = "one";  private static final String TWO = "two";  private static final String THREE = "three";  /**   * ImageRegistryTest constructor   */  public ImageRegistryTest() {    super(null);  }  /**   * Runs the application   */  public void run() {    setBlockOnOpen(true);    open();    Display.getCurrent().dispose();  }  /**   * Creates the window's contents   *    * @param parent the parent composite   * @return Control   */  protected Control createContents(Composite parent) {    Composite composite = new Composite(parent, SWT.NONE);    composite.setLayout(new FillLayout());    // Put the images in the registry    ImageRegistry ir = new ImageRegistry();    ir.put(ONE, ImageDescriptor.createFromFile(ImageRegistryTest.class,        "java2s.gif"));    ir.put(TWO, ImageDescriptor.createFromFile(ImageRegistryTest.class,        "java2s.gif"));    ir.put(THREE, ImageDescriptor.createFromFile(ImageRegistryTest.class,        "java2s.gif"));    // Create the labels and add the images    Label label = new Label(composite, SWT.NONE);    label.setImage(ir.get(ONE));    label = new Label(composite, SWT.NONE);    label.setImage(ir.get(TWO));    label = new Label(composite, SWT.NONE);    label.setImage(ir.get(THREE));    getShell().pack();    return composite;  }  /**   * The application entry point   *    * @param args the command line arguments   */  public static void main(String[] args) {    new ImageRegistryTest().run();  }}

但是一般应用程序图片比较多，图片增加，删除，修改名称时，都要动这个文件，注册起来比较麻烦，于是想了一个办法，把图片放到一个目录里，然后，遍历目录自动注册，以图片名称作为key

public class Registry {private static Logger logger = LoggerFactory.getLogger(Registry.class);private static String imagePath = Registry.class.getResource("images/").getPath();private static ImageRegistry imageRegistry = JFaceResources.getImageRegistry();static {initRegistry();}public static Image getImage(String key) {Image image = imageRegistry.get(key);if (image == null) {image = ImageDescriptor.getMissingImageDescriptor().createImage();}return image;}public static ImageDescriptor getDescriptor(String key) {ImageDescriptor descriptor = imageRegistry.getDescriptor(key);if (descriptor == null) {descriptor = ImageDescriptor.getMissingImageDescriptor();}return descriptor;}private static void initRegistry() {Collection<File> files = FileUtils.listFiles(new File(imagePath), null, false);for (File file : files) {imageRegistry.put(file.getName(),ImageDescriptor.createFromFile(Registry.class, "images/" + file.getName()));}}}

因为图片基本是配置在properties文件里，所有文件增加，删除，修改，不用手动注册，只要改一下properties文件即可！

注意一点，此类在做单元测试时要注意：一定要搞个shell出来，不然JFaceResources.getImageRegistry()会报空！调了N长时间

单元测试参考代码：

@Testpublic void testImageRegistry() {Display display = new Display();Shell shell = new Shell(display, SWT.NO);shell.setImage(display.getSystemImage(SWT.ICON_WARNING));shell.setBounds(100, 100, 640, 480);shell.setText("testImageRegistry");assertNotNull(JFaceResources.getImageRegistry());// must initialize a shell!!!// shell.open();// while (!shell.isDisposed()) {// if (!display.readAndDispatch())// display.sleep();// }// display.dispose();}