POSA layered structure
The URI Uniform Resource Identifier (URI) is a short string to identify resources in the Internet or other networks. Resources can be a document, image, download file, email, or other things. A URI can correspond to a path to a server file system, but there is usually an alias. Many of the URIs in the Strtuts application are Java classes or an alias. Because the path is defined in the configuration file, you can change your mind at any time without contacting the JSP source code. If you change and overload the configuration file, change will take effect on the next processing next time.
Struts action URI
