Page Listing For A Specific Folder, Index page of a folder

Hi

I had searched the forum but didn't find any solution works for me.

I am planing a site with a simple structure like this: Under the home page there are some folders, in each folder there are some articles and an index page. I hope the index page of every folder can:

1-- In the content area, lists all the article pages' URLs and the article's description(maybe using "Excerpt" of a page) of its own folder, no other folder's articles.

2-- In the sidebar, only list the URLs under this folder.

For creating the folder index page, I am thinking through the "Index Templates" to create the custom index template. In the "Output File" form, I try to make "folder1/index.html". If I will have 5 folders, then I will create till "folder5/index.html" 5 custom index templates. (Is there any better method to do this?)

I've tried some code set here, but still the index page can't output the page list under the specific folder, only can give me all the folders and all the articles.

This troubled me a few days, please!!