getActiveWorkbenchWindow 有如下声明

/**
	 * Returns the currently active window for this workbench (if any). Returns
	 * <code>null</code> if there is no active workbench window. Returns
	 * <code>null</code> if called from a non-UI thread.
	 * 
	 * @return the active workbench window, or <code>null</code> if there is
	 *         no active workbench window or if called from a non-UI thread
	 */
	public IWorkbenchWindow getActiveWorkbenchWindow();

PlatformUI.getWorkbench().getDisplay().asyncExec(new Runnable() {
				public void run() {
					IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
					System.out.println(window);
				//做想要做的事情吧。
			
				}
			});