301 redirect from root to subfolder

301 redirection from root to subfolder

[tpkl]

Hi,

I need to set up a permanent 301 redirect:

A] http://example.com/ should redirect to http://www.example.com/

B] http://example.com/test.html or http://www.example.com/test.html should redirect to http://www.example.com/subfolder/test.html

how to do this?

I used the following code for non 'www' to www version in my htaccess

RewriteEngine on
RewriteCond %{HTTP_HOST} ^example\.com$
RewriteRule ^(.*)$ http://www.example.com/$1 [R=301,L]

But for point B] i need some code

thanks in advance...