CODEWITHSUNDEEP
javaweb-applications
Kliver Max
Kliver Max

Reputation: 5299

How to make session in Java?

I need make sessions in Java web application.
I found that sesstion makes in servlet calass by method getSession().
But i have a question about session parameters. For example i send to server login/pass and save it into session atributes. Okey. Next time i do something on client and send new params to server. Where i gonna send it? In another or same and i gonna use if else for handle params like this?

enter image description here Another question: How to use params which i put in session(login/pass) in another classes?

UPDATE

I read about sessions. And have new question. How to use session params in enother class. I mean after login i send new params on server, read it in servlet and want to take a login/pass from session and send it with new params into another class.

Upvotes: 3

Views: 20118

Answers (2)

amicngh
amicngh

Reputation: 7899

Session is associated with each request . Now it depends whether client join the session or not there are three overloaded methods of getSession() to get more about them please go through the documents. Now if session is aleady associated with the request get existing session set the attribute in session and vice-versa if not create new session and do the same.

if the server used only cookie-based sessions, and the client had disabled the use of cookies, then a session would be new on each request.

I hope this helped.

Upvotes: 0

Juned Ahsan
Juned Ahsan

Reputation: 68715

As part of your request handling in a doGet or doPost method, here is how you can get session and use it to get and set variables.

//Obtain the session object, create a new session if doesn't exist
HttpSession session = request.getSession(true);

//set a string session attribute
session.setAttribute("MySessionVariable", "MySessionAtrValue");

//get a string sessson attribute
String strParam = session.getAttribute("MySessionVariable");


//get an integer sessioin attribute
Integer param = (Integer) session.getAttribute("MySessionVariable");

//set an integer session attribute
session.setAttribute("MySessionVariable", new Integer(param.intValue() + 1));

Upvotes: 6

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