?? updatecartservlet.java
字號:
// Fig. 16.37: UpdateCartServlet.java
// Changes quantity of an item in shopping cart
package cartXML;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.sql.*;
public class UpdateCartServlet extends HttpServlet {
public void service( HttpServletRequest req,
HttpServletResponse res )
throws ServletException, IOException
{
HttpSession session = req.getSession( true );
ShoppingCart cart = ( ShoppingCart ) session.getAttribute(
"cart" );
ServletContext sc = getServletConfig()
.getServletContext();
if ( cart.getUsername() == null ) {
sc.getRequestDispatcher( "/index.wml" )
.forward( req, res );
return;
}
String productID = req.getParameter( "productID" );
int bookElement = cart.contains( productID );
int quantity = Integer.parseInt( req.getParameter(
"quantity" ) );
if ( quantity == 0 )
cart.remove( bookElement );
else
cart.setQuantity( bookElement, quantity );
session.setAttribute( "cart", cart );
sc.getRequestDispatcher( "/servlet/cartXML.ViewCartServlet" )
.forward( req, res );
}
}
/*
**************************************************************************
* (C) Copyright 2001 by Deitel & Associates, Inc. and Prentice Hall. *
* All Rights Reserved. *
* *
* DISCLAIMER: The authors and publisher of this book have used their *
* best efforts in preparing the book. These efforts include the *
* development, research, and testing of the theories and programs *
* to determine their effectiveness. The authors and publisher make *
* no warranty of any kind, expressed or implied, with regard to these *
* programs or to the documentation contained in these books. The authors *
* and publisher shall not be liable in any event for incidental or *
* consequential damages in connection with, or arising out of, the *
* furnishing, performance, or use of these programs. *
**************************************************************************
*/
?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -