Java Reference
In-Depth Information
L
ISTING
20.9
Continued
}
}
finally {
pool.releaseConnection(con);
}
}
}
The
AddToCart
Service
The
AddToCart
class is also an implementation of the
Service.execute()
method. Its
execute()
method starts its execution when a user selects a movie from the
ListMovies.jsp
,
which lists all of the movies found as a result of the
ListMovies
service. It gets the ID of the
selected movie from the request and performs a select statement on the Titles table, returning a
ResultSet
containing the movie's attributes. It then adds these attributes to the
ShoppingCart
found in the user's
HttpSession
and forwards the process to the named target on the request,
which in this case is the previously listed
ListShoppingCart.jsp
. The source for the
AddToCart
service is in Listing 20.10.
L
ISTING
20.10
AddToCart.java
import Service;
import ShoppingCart;
import ConnectionPool.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletContext;
import java.sql.*;
public class AddToCart implements Service {
public AddToCart() {
}
20
/*
implemented method from Service interface
*/
public void execute(HttpServletRequest request,
HttpServletResponse response,
ServletContext context) throws Exception {
