Struts: It's just like traffic controller for the servlet, http request and http response. The core part of Struts framework is the Action Mapping file which is a xml file.

This Mapping file is a good start for getting the big picture of the whole web applicaiton if it replies on it for handling http request and response.

Structs also provide the message properties files which can acted as the content of the page. The jsp page can call the entries of this message properties files as the source of the content. It will be benefit for storing the content in different coding without changing the setting of character set of the pages.

However, I personally did not like the program or application heavily reply on the external framework too much. If there is any bugs or security holes of this program. Then my program would be spoiled.