获得一个文件真是麻烦

IPath path = new Path("org.jbpm.ui/gpd.xml");
IWorkspaceRoot workspaceRoot = ResourcesPlugin.getWorkspace().getRoot();
IFile file = workspaceRoot.getFile(path);

文件只能通过workspace范围内，那个org.jbpm.ui是project名，看着挺别扭的...