Struts action class that corresponds to the search results page. Used for
requests to "/Search.do".
The execute method of this class retrieves information from the
database for the list of products in the system matching a given search
string and puts it in the request scope for use by the view layer. Given a
SearchForm with its
searchString property populated, it creates and initializes an
ProductList. It then
to load the product list information from the database. It puts the
initialized ProductList object in the request scope as an
attribute with the name "productList".