http://www.cnblogs.com/youngerbaby/archive/2006/10/16/530268.html
EditorPart[] parts =
PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getEditors();
或者
IEditorReference[] parts = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getEditorReferences();