Question

HOW DO I MAKE A CART A SESSION???HELP!!

Asked by: appl3

I HAVE A CART WHICH IS A VECTOR DECLARED IN MY BEAN EG:

PRIVATE VECTOR CART = NEW CART

OR SOMETHING LIKE THIS.   THE USER BUYS AN ITEM AND THIS IS ADDED TO MY BASKET WHICH IS IN SESSION SCOPE.  I CAN VIEW THE CART AND SEE WHAT IS INSIDE IT ALRIGHT BUT HOW DO I CARRY THE ITEMS IN THE BASKET ONTO THE PAGE WHERE THE USER ENTER THEIR CARD DETAILS OR ANY OTHER PAGE FOR THAT MATTER?

I CAN USE SESSION.SETATTRIBUTE("NAME", MYNAME) AND GET MY NAME OUT BUT HOW ON EARTH DO I GET ALL THE ITEMS IN THE CART PRINTED OUT??  PLEASE HELP.  I HAVE AN ITEM CLASS WHICH HOLDS A SINGLE ITEM.  MY CART THEN HAS ITEMS IN IT. ONE OR  MORE.  IF I DO SESSION.SETATTRIBUTE("CART", ITEMS) THIS IS VERY WRONG.  I WILL ALSO NEED TO CAST THE SESSION TO A VECTOR AND NOT A STRING??

I AM USING JSP WITH JAVABEANS.

This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.

Subscribe now for full access to Experts Exchange and get

Instant Access to this Solution

  • Plus...
  • 30 Day FREE access, no risk, no obligation
  • Collaborate with the world's top tech experts
  • Unlimited access to our exclusive solution database
  • Never be left without tech help again

Subscribe Now

Asked On
2003-04-16 at 10:48:38ID20587327
Topic

Java Server Pages (JSP)

Participating Experts
3
Points
500
Comments
14

Trusted by hundreds of thousands everyday for fast, accurate and reliable tech support.

  • "The time we save is the biggest benefit of Experts Exchange to Warner Bros. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange." Mike Kapnisakis, Warner Bros.
  • "Our team likes having a resource that is more secure than just using Google and most experts using this service really know their stuff. It's nice to look here first versus using Google." Dayna Sellner, Lockheed Martin
  • "Anytime that I've been stumped with a problem, 9 out of 10 times Experts Exchange has either the accepted solution or an open discussion of the potential solution to the problem." Kenny Red, eBay Inc.

See what Experts Exchange can do for you.

Got a question?

We've got the answer.

Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.

Screenshot of Experts Exchange Knowledgebase

Need individual assistance?

Our experts are ready to help.

If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.

Screenshot of Experts Exchange Knowledgebase

Want to learn from the best?

Read articles from industry experts.

Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.

Screenshot of an Article

Working on a long term project?

Store your work and research.

Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.

Screenshot of Experts Exchange Knowledgebase

Access the answers to your technology questions today.

Subscribe Now

30-day free trial. Register in 60 seconds.

What Makes Experts Exchange Unique?

Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.

Trusted by the world's most respected brands.

image of each brand's logo

Faithfully serving IT professionals since 1996.

Experts Exchange Logo

Try it out and discover for yourself.

Subscribe Now

30-day free trial. Register in 60 seconds.

Related Solutions

  1. JSP, Javabeans and session timeout
    Hello everybody, I have a strange problem: I have a JSP that calls a Javabean. This bean creates a temporary file that must be deleted when the user exits the web application. So, the javabean has a vector that stores the file name of the created file. in the filnalize() ...
  2. HowTo manage a "cart" with JSP and session variable ?
    Hi I've been told that I could manage a "cart" using JSP technology and session variable (SV). In my SV, I'll store (all along a session) only two numbers and two "strings". How can i do to init the SV ? to add information and retrieve them ? Thanks for h...
  3. shopping carts and SSL
    this is a 2 part question.. thats why its got loads of points for you expert dudes... 1. How do you use SSL in jsp pages and what is involved..? 2. Is there any tutorials on shopping cart apps and/or free existing code available..? 1 and 2 are linked.. wanna use SSL ...
  4. Shopping Cart problem
    Hi I successfully added my item to the cart and when I click on continue shopping link which brings me back to a display of a list of product. I added additional items to the cart. This bring me to my shopping cart page. But it replaces my first item that was added. I can onl...

Free Tech Articles

  1. WARNING: 5 Reasons why you should NEVER fix a computer for free.
    It is in our nature to love the puzzle. We are obsessed. The lot of us. We love puzzles. We love the challenge. We thrive on finding the answer. We hate disarray. It bothers us deep in our soul. W...
  2. SCCM OSD Basic troubleshooting
    SCCM 2007 OSD is a fantastic way to deploy operating systems, however, like most things SCCM issues can sometimes be difficult to resolve due to the sheer volume of logs to sift through and the dispe...
  3. Migrate Small Business Server 2003 to Exchange 2010 and Windows 2008 R2
    This guide is intended to provide step by step instructions on how to migrate from Small Business Server 2003 to Windows 2008 R2 with Exchange 2010. For this migration to work you will need the fo...
  4. Create a Win7 Gadget
    This article shows you how to create a simple "Gadget" -- a sort of mini-application supported by Windows 7 and Vista. Gadgets can be dropped anywhere on the desktop to provide instant information, ...
  5. Outlook continually prompting for username and password
    There have been a lot of questions recently regarding Outlook prompting for a username and password whilst using Exchange 2007. There are a few reasons why this would happen and I will try to cover t...
  6. Backup Exchange 2010 Information Store using Windows Backup
    There seems to be quite a lot of confusion around the ability to backup Exchange 2010 using the built in Windows Backup feature. This stems from the omission of this feature prior to Exchange 2007 s...

Cloud Class Webinars

  1. Avoiding Bugs in Microsoft Access
    Alison Balter takes and in-depth look at avoiding bugs in Access. In this webinar you will learn about using the immediate window to debug your applications, invoking the debugger, using breakpoints to troubleshoot, stepping through code, setting the next statement to execute, ...
  2. Top 10 Best New Features in Visio 2010
    Scott Helmers gives live demonstrations of the top 10 new features in Visio 2010. This webinar will teach you how to create compelling diagrams by adding shapes to the page with a single click, linking the shapes in a diagram to data in Excel (or SQL Server, or SharePoint), ...
  3. IT Consultant Business Secrets Revealed
    Michael Munger, Experts Exchange tech pro and IT consultant, pulls back the curtain on his very successful businesses and answers question on every IT consultant and business owner should know about. He shares secrets on what he did to solve the 5 most common problems in IT, ...
  4. Disaster Recovery and Business Continuity
    Quest CTO, Mike Billon, gives an overview of the steps involved in building a dunamic disaster recovery plan. Through case studies and an examination of software/hardware tooles for monitoring and testing, you'll gain a better understandin of where you are, where you want ...
  5. Organize Your Visio Diagrams with Containers and Lists
    Scott Helmers uses cross functional flowcharts, wireframe diagrams, data graphic legends and seating charts to teach you: how to ustilize all three new structured diagram components in Visio 2010, the best practices for organizeing shapes in previous version of Visio, how to organize ...
  6. How to Us Objects, Properties, Events and Methods in Microsoft Access
    Alison Dalter gives an in-depbth look at objects, properties, events and methods in Microsoft Access. In this webinar you will learn about using the object browser, referring to objects, working with properties and methods, working with object variables, understanding the ...

Join the Community

Give a Little. Get a Lot.

Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.

Join the Community

Answers

 

by: appl3Posted on 2003-04-16 at 10:49:18ID: 8342771

HELP.

 

by: Binary1Posted on 2003-04-16 at 11:25:49ID: 8343052

Try using a Bean instead of a session.setattribute.

<jsp:useBean id="myCart" class="java.util.Vector" scope="session" />

As long as you refer to it by the same name and same scope you will have access to it in every page you need it.

You can then just walk through the items in the Vector

 

by: kennethxuPosted on 2003-04-16 at 12:34:08ID: 8343541

I agree with Binary1 if you use it in jsp.

in servlet or beans, use:

Set:
Vector myCart = new Vector();
......
session.setAttribute( "myCart", myCart );

Get:
Vector myCart = (Vector) session.getAttribute( "myCart" );

 

by: appl3Posted on 2003-04-17 at 05:08:10ID: 8347550

public class CarttestBean implements Serializable
{    
     private Vector cart = new Vector();
     
     private String bnDbDriver = "mysql.Driver";
     private String bnDbId = "jdbc:mysql://";
     private String bnDbUser = "user";
     private String bnDbPassword = "pw";
     private String bnStockDescription = "";
     private String bnStockSize = "";
     private String bnStockColor = "";
     private String bnStockCode = "";
     private String bnStockPrice;
     private String bnRemoveCode = "";
     private String bnStockQuantity ="";
     private String bnCustomerAddress ="";

then....getter and setter methods etc


In my Item class, i have only set and get methods for these declared vars.

class Item {
     private String bnStockDescription = "";
     private String bnStockSize = "";
     private String bnStockColor = "";
     private String bnStockCode = "";
     private String bnStockPrice = "TEST TEST";
     private String bnStockQuantity = "";


in my jsp page i have

<jsp:useBean
     id="myCarttestBean"
     scope="session"
     class="projbeans.CarttestBean"
     />

 

by: Binary1Posted on 2003-04-17 at 05:43:14ID: 8347771

You should have access to your Bean from every page that you include that jsp:useBean. I assume that your CarttestBean class has a way to add an item to your field 'cart'.

Do you have a method to retrieve either a clone of 'cart' or a way to call to get an item back? If that is what you are asking you can do this in several ways:

1: keep an internal counter that tracks which item to return next

   have a nextItem() method that would return the next item from the 'cart' and increment the internal counter

   have a reset method that would reset the internal counter back to the start of the cart


2: Have a getCartSize() method that would return the number of items in the 'cart'

   Have a getItem(int) method that would return the item at that index in the 'cart'


3: Have a method getCart() that would return a clone of the 'cart'. You probably don't want to return the 'cart' itself because then you open up the cart to be modified by something other than the Bean.


 

by: appl3Posted on 2003-04-22 at 09:56:46ID: 8374577

No, i do not have a method to ret a clone of the cart.  Whats the easiet way to do this.  It is odd that you find so many other things on these sites except real help with things like creating carts using jsp etc.

 

by: Binary1Posted on 2003-04-23 at 08:34:22ID: 8381038

You can use the clone() method of your cart vector. In your Class CarttestBean include a get function that returns the clone:

public Vector getCart() {
    return cart.clone();
}

 

by: appl3Posted on 2003-04-24 at 07:48:20ID: 8389143

I give up but thanx for your time.

 

by: Binary1Posted on 2003-04-24 at 10:22:07ID: 8389967

Are you looking for example code? If you've implemented what is described in your posts you can print out the cart like this:

// Get a local "copy" of the cart. The getCart() method should return
// a clone copy of the actual cart. It can return the cart itself
// but keep in mind that you leave yourself open to modifications
// being made to it that you where not aware of.
Vector cartItems = myCarttestBean.getCart();

// The size() method of Vector will let you know how many
// items you've placed in the cart
if ( cartItems.size() == 0 ) {
      out.println("You have no items in your cart");
} else {
      for ( int i = 0; i < cartItems.size(); i++ ) {
            // Get the current indexed item out of the
            // cart and display it
            item inCart = (item) cartItems.elementAt(i);

            // inCart now contains an instance of one of the
            // cart items - Print out the item how you want
           out.println("Description: " + inCart.getBnStockDescription());
           out.println("Size: " + inCart.getBnStockSize());
           out.println("Color: " + inCart.getBnStockColor());
           out.println("Product Code: " + inCart.getBnStockCode());
           out.println("Price: " + inCart.getBnStockPrice());
           out.println("Quantity: " + inCart.getBnStockQuantity());
           out.println("Total: " + (inCart.getBnStockPrice() * inCart.getBnStockQuantity()));
      }
}

 

by: appl3Posted on 2003-04-25 at 06:01:34ID: 8394931

Thank you for your time but I am going to leave that one for the time being.  Its still not doing what I want it to.  Maybe you could help with this...how do you input today's date into a sql database table.  Note sql and not oracle.  Say a customer orders an item today...how do you handle this, like set it in the bean etc.

 

by: Binary1Posted on 2003-04-25 at 12:25:10ID: 8397634

There are a couple of different ways depending on how you want to represent the date. Most databases have a built in function that can be used to generate the current date/time of the system and is useful for inputing the current date into a date column. A lot of times this is the method used to audit and track changes to database records.

If you want to generate the current date time in your Java bean you can do this a couple of ways.

The java.util.Date class will initialize to the current date time. Date.getTime() returns a long value representing the number of milliseconds from Jan. 1, 1970. The Date.toString() method will print the date/time out in a readable fashion. I don't know if either of these will work for you to insert into the database. It will depend on the column type of the field. The DateFormat class will allow you to format the output. The Java documentation gives a better description and includes some sample code:

http://java.sun.com/j2se/1.4.1/docs/api/java/text/DateFormat.html

The Calendar and GregorianCalendar classes will create a class object initialized to the current date/time and provide methods for retrieving the component parts of the date (Year, Month, Day, etc). These could be used to construct a string to insert into a date column in the database.

The java documentation for the GregorianCalendar class includes some example code for retrieving the current year, month, and day information.

http://java.sun.com/j2se/1.4.1/docs/api/java/util/GregorianCalendar.html


 

by: appl3Posted on 2003-04-26 at 19:55:32ID: 8403464

B1 you have been so very helpful.  Thank you for taking the time.  I am exploring my options at the moment.  i am just stuck but thanx anyway.  I am not a prof like you guys are you see.

 

by: girionisPosted on 2004-01-12 at 04:21:42ID: 10094729

No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:

- Points to Binary1

Please leave any comments here within the next seven days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

girionis
EE Cleanup Volunteer

20120131-EE-VQP-002

3 Ways to Join

30-Day Free Trial

The Experts

98% positive feedback on 31,087 answers since March 2000. angeliii is a Microsoft Most Valuable Professional for his work with MS SQL Server & Develoment.

He has also proven his knowledge of Visual Basic Programming, PHP Scripting and Oracle Databases.

The Experts

97% positive feedback on 10,752 answers since July 2000. lrmoore has more than 18 years experience in the networking industry.

The six-time Mircosoft MVPs specialties include firewalls, virtual private networking, and network management.

Testimonials

"...and excellent source for support... Kind of like having your very own IT dept." Electriciansnet

Testimonials

"I was apprehensive at signing up at first. However... it has already made my life as an IT administrator much easier." JaCrews

Testimonials

"WOW! You guys have great, active, and knowledgeable people on here." moore50

Business Clients

Business Clients

In the Press

"If you’ve got a question... Experts Exchange can supply an answer.”

In the Press

"...an invaluable aid for both IT professionals and those who require tech support."

In the Press

"where IT professionals provide quick answers on just about any topic"

Business Account Plans

Loading Advertisement...