You certainly can. Contribution Folders are metadata of documents, so you should be able to get them in a similar way like document name.
In you particular case, a good question is how your nodes were constructed. I believe it is some query on documents. If so, it should be relatively easy to add content folders to be returned by the query (maybe they already are).
Another question could be if document's metadata are what you are looking for. With folders it might also make sense to display hierarchy of folders. Note that standard task flows like Folder Viewer might already contain the necessary code/functionality.
i want to display the Conribution folder name only without its content , i know if i want to display the folder of contents i can use
but i don't need that , just what i need to get contribution folders names on webcenter page
I'm afraid I don't understand what your intentions are.
a) are you trying to display information about folders, or documents?
b) do you know what the content of your node hierarchy is? (folders or documents?)
It seems that it contains documents and you are able to achieve the content folder assigned to a document, but what documents are there?
And it also seems that you rather want to display information about folders. Would you mind explaining your scenario in the plain language?
In fact, I guess that your requirements might be satisfied by standard task flows, perhaps, a bit customized, but you should first explain what they are.
Well, one way to do (from the scratch) is to query the WebCenter Content's database. Folders are stored in the table called Collections. You will need the dCollectionName column, rows are linked via dCollectionId and dParentCollectionId columns.
If you want to reuse existing resources you may take any of document service task flows mentioned at http://docs.oracle.com/cd/E21764_01/webcenter.1111/e10148/jpsdg_content_jsfpg.htm#CHDFEGAB which provides Folder and File Listings
I haven't seen insides of any of them (what statements are used), but you should be able to use: http://docs.oracle.com/cd/E21764_01/webcenter.1111/e10148/jpsdg_taskflows.htm#BACIEGJD to see it. Besides, I'd recommend to consider re-using the task flows.