You did you deploy your application? And by "site's folder", do you mean the WAR file (or directory in the case of n exploded deployment)?
Typical deployment in JBoss AS means copying the WAR/EAR/JAR/etc. file or directory to server/default/deploy. It is fairly difficult to lose the WAR when done in this manner.
The Site's folder mean folder after of deploy ... no WAR/EAR/JAR.. etc...
I still do not know what you mean. What do you mean by "Site"? And how can you say "no WAR/EAR/JAR"? Only apps deployed as WAR/EAR/JAR and so on can be deployed to JBoss AS, so you must be using one of those?
By "Site", do you mean the URL for your web application? If you web application is beployed as xxx.war, then the URL is http://localhost:8080/xxx. The WAR's base name ('xxx' in this example) is the default context name (the 'xxx' part of the URL.
Are you by any chance using Eclipse or NetBeans?
Also, what version of JBoss AS?
No ... I wanna access the folder's site into JBOSS..
Example Glassfish: /sun/glassfish/domains/site/......
In the JBOSS, where's the folder?
if you throw Foo.war into server/default/deploy, it will extrace it somewhere under server/deploy/tmp (vfs?) but it's only for internal use.
the "default" directory could be called a domain in GF terms(?)
I don't know Glassfish. There is no such concept as "site" in JBoss AS. So you need to first tell us how Glassfish uses the site directory. Once we understand that we should be able to answer your question.