Eclipse RCP 从菜单打开Editor

public class OpenEditorHander extends AbstractHandler implements IHandler {

    @Override
    public Object execute(ExecutionEvent event) throws ExecutionException {
        // HandlerUtil.getActiveWorkbenchWindow(event).close();
        IEditorInput editorInput = new DBConfigEditInput();
        IWorkbenchPage workbenchPage = PlatformUI.getWorkbench()
                .getActiveWorkbenchWindow().getActivePage();
        IEditorPart editorPart =workbenchPage.findEditor(editorInput);
        try {
            workbenchPage.openEditor(editorInput, "sm.core.ui.DBConfig");
        } catch (PartInitException e) {
            e.printStackTrace();
        }
        return null;
    }
}