How to manage several sessions

Hallo,
my problem is following :
I develop an online shop system in which user sign up and buy some items.
the user information and the item information will be saved in an HttpSession object and then the user will be forwarded to a epayment gateway (paypal or ipayment) and pay the amount and will be forwarded to my site again.
in this time I get some information from epayment gateway, control them and if they are true I want to save the payment, user and item information to the DB but in this case I can not reach to the first information which I have already saved to the session (I think i get a new session from payment)
how can I manage this sessions together without lose any information?
thanks a lot
Taylan

I don't think you want to do it this way. I think this strategy will work better:
1) save initial data to database, get ID
2) epayment redirect with ID
3) update database with results
If the user interrupts the payment you will have a record in your database that is incomplete, but that can be cleaned up through a regular maintenance task, if you even want that (might be useful to have orders that are placed but not succesfully paid for, if the user is having problems you can perhaps contact them manually to assist them (you = owner of website)).
This way no session needs to be maintained, all you need is an ID value that you can send along through the payment routine.

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1. What is Session Tracking?
There are a number of problems that arise from the fact that HTTP is a "stateless" protocol. In particular, when you are doing on-line shopping, it is a real annoyance that the Web server can't easily remember previous transactions. This makes applications like shopping carts very problematic: when you add an entry to your cart, how does the server know what's already in your cart? Even if servers did retain contextual information, you'd still have problems with e-commerce. When you move from the page where you specify what you want to buy (hosted on the regular Web server) to the page that takes your credit card number and shipping address (hosted on the secure server that uses SSL), how does the server remember what you were buying?
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* Extracting the cookie that stores the session identifier from the other cookies (there may be many, after all),
* Setting an appropriate expiration time for the cookie (sessions interrupted by 24 hours probably should be reset), and
* Associating information on the server with the session identifier (there may be far too much information to actually store it in the cookie, plus sensitive data like credit card numbers should never go in cookies).
2. URL Rewriting. You can append some extra data on the end of each URL that identifies the session, and the server can associate that session identifier with data it has stored about that session. This is also an excellent solution, and even has the advantage that it works with browsers that don't support cookies or where the user has disabled cookies. However, it has most of the same problems as cookies, namely that the server-side program has a lot of straightforward but tedious processing to do. In addition, you have to be very careful that every URL returned to the user (even via indirect means like Location fields in server redirects) has the extra information appended. And, if the user leaves the session and comes back via a bookmark or link, the session information can be lost.
3. Hidden form fields. HTML forms have an entry that looks like the following: <INPUT TYPE="HIDDEN" NAME="session" VALUE="...">. This means that, when the form is submitted, the specified name and value are included in the GET or POST data. This can be used to store information about the session. However, it has the major disadvantage that it only works if every page is dynamically generated, since the whole point is that each session has a unique identifier.
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Using sessions in servlets is quite straightforward, and involves looking up the session object associated with the current request, creating a new session object when necessary, looking up information associated with a session, storing information in a session, and discarding completed or abandoned sessions.
2.1 Looking up the HttpSession object associated with the current request.
This is done by calling the getSession method of HttpServletRequest. If this returns null, you can create a new session, but this is so commonly done that there is an option to automatically create a new session if there isn't one already. Just pass true to getSession. Thus, your first step usually looks like this:
HttpSession session = request.getSession(true);
2.2 Looking up Information Associated with a Session.
HttpSession objects live on the server; they're just automatically associated with the requester by a behind-the-scenes mechanism like cookies or URL-rewriting. These session objects have a builtin data structure that let you store any number of keys and associated values. In version 2.1 and earlier of the servlet API, you use getValue("key") to look up a previously stored value. The return type is Object, so you have to do a typecast to whatever more specific type of data was associated with that key in the session. The return value is null if there is no such attribute. In version 2.2, getValue is deprecated in favor of getAttribute, both because of the better naming match with setAttribute (the match for getValue is putValue, not setValue), and because setAttribute lets you use an attached HttpSessionBindingListener to monitor values, while putValue doesn't. Nevertheless, since few commercial servlet engines yet support version 2.2, I'll use getValue in my examples. Here's one representative example, assuming ShoppingCart is some class you've defined yourself that stores information on items being purchased.
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doSomethingWith(previousItems);
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previousItems = new ShoppingCart(...);
doSomethingElseWith(previousItems);
In most cases, you have a specific attribute name in mind, and want to find the value (if any) already associated with it. However, you can also discover all the attribute names in a given session by calling getValueNames, which returns a String array. In version 2.2, use getAttributeNames, which has a better name and which is more consistent in that it returns an Enumeration, just like the getHeaders and getParameterNames methods of HttpServletRequest.
Although the data that was explicitly associated with a session is the part you care most about, there are some other pieces of information that are sometimes useful as well.
* getId. This method returns the unique identifier generated for each session. It is sometimes used as the key name when there is only a single value associated with a session, or when logging information about previous sessions.
* isNew. This returns true if the client (browser) has never seen the session, usually because it was just created rather than being referenced by an incoming client request. It returns false for preexisting sessions.
* getCreationTime. This returns the time, in milliseconds since the epoch, at which the session was made. To get a value useful for printing out, pass the value to the Date constructor or the setTimeInMillis method of GregorianCalendar.
* getLastAccessedTime. This returns the time, in milliseconds since the epoch, at which the session was last sent from the client.
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As discussed in the previous section, you read information associated with a session by using getValue (or getAttribute in version 2.2 of the servlet spec). To specify information, you use putValue (or setAttribute in version 2.2), supplying a key and a value. Note that putValue replaces any previous values. Sometimes that's what you want (as with the referringPage entry in the example below), but other times you want to retrieve a previous value and augment it (as with the previousItems entry below). Here's an example:
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// You still have to do putValue, not just modify the cart, since
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session.putValue("previousItems", previousItems);
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Here is a simple example that generates a Web page showing some information about the current session. You can also download the source or try it on-line.
package hall;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.net.*;
import java.util.*;
/** Simple example of session tracking. See the shopping
* cart example for a more detailed one.
* <P>
* Part of tutorial on servlets and JSP that appears at
* http://www.apl.jhu.edu/~hall/java/Servlet-Tutorial/
* 1999 Marty Hall; may be freely used or adapted.
public class ShowSession extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
HttpSession session = request.getSession(true);
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String title = "Searching the Web";
String heading;
Integer accessCount = new Integer(0);;
if (session.isNew()) {
heading = "Welcome, Newcomer";
} else {
heading = "Welcome Back";
Integer oldAccessCount =
// Use getAttribute, not getValue, in version
// 2.2 of servlet API.
(Integer)session.getValue("accessCount");
if (oldAccessCount != null) {
accessCount =
new Integer(oldAccessCount.intValue() + 1);
// Use putAttribute in version 2.2 of servlet API.
session.putValue("accessCount", accessCount);
out.println(ServletUtilities.headWithTitle(title) +
"<BODY BGCOLOR=\"#FDF5E6\">\n" +
"<H1 ALIGN=\"CENTER\">" + heading + "</H1>\n" +
"<H2>Information on Your Session:</H2>\n" +
"<TABLE BORDER=1 ALIGN=CENTER>\n" +
"<TR BGCOLOR=\"#FFAD00\">\n" +
" <TH>Info Type<TH>Value\n" +
"<TR>\n" +
" <TD>ID\n" +
" <TD>" + session.getId() + "\n" +
"<TR>\n" +
" <TD>Creation Time\n" +
" <TD>" + new Date(session.getCreationTime()) + "\n" +
"<TR>\n" +
" <TD>Time of Last Access\n" +
" <TD>" + new Date(session.getLastAccessedTime()) + "\n" +
"<TR>\n" +
" <TD>Number of Previous Accesses\n" +
" <TD>" + accessCount + "\n" +
"</TABLE>\n" +
"</BODY></HTML>");
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}

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Hi Java Gurus,
Can any body tell me how to manage session in java.
I have two url say http://www.xyz/userlogin.php, http://www.xyz/sendsms.php
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Sub : How to manage session ?

Hi Java Gurus,
Can any body tell me how to manage session in java.
I have two url say http://www.xyz/userlogin.php, http://www.xyz/sendsms.php
1st url gives the login form and second one coes after succesfull login.
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I am able to access login form, but after login when I connect second url, it gives session expired message in the html stream.
This is because I am not managing session. So can any body have any idea or pointer. How I can manage sesssion and access second page after succesfull login.
I will appreciate your help.
Thanks and regards -
Vikas Kumar Sahu.

What I do in some of our test-clients is that I call the login and get all the cookies from the header and add them to the next request.
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Message was edited by:
Lajm

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Xin Zhuang wrote:
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