Java Servlet how to get a specific value from a session attribute

Question

OK, I'm kind of inept at explaining my problems, but I'll try to be as detailed, yet concise as possible.

I have 2 servlets; NewCustomerServlet and LoginServlet

I have 1 Java bean; User

The User has a bunch of fields. username, firstName, password, etc...

my index.jsp automatically directs the user to NewCustomerServlet, so the user can create an "account" Once they finish filling in the fields the User bean is created and saved in the session. Then, the user is able to "login"

The problem I'm having is validating the username from the "user" session with the login.jsp fields using the session.

How do I access the sessions "username" or "password" field. All I can seem to access is the name of the session, which would be "user"?

pczeus · Accepted Answer · 2016-04-19 21:46:40Z

1

Referencing the JavaDoc for HttpSession,

You will realize that HttpSession stores attributes by key, just like a HashMap, you would place objects in the session (Any serializeable object) like:

String userName = "something";//
session.setAttribute("username", userName);

Then you can get it back out using:

String un=(String)session.getAttribute("username");

It is possible to store more complex objects, like an entire User object, as long as that object implements Serializable:

User someUser = //details left to the OP
session.setAttribute("user", someUser);

Then you can later retrieve the information for that user:

User someUser = (User)session.getAttribute("user");
if(user != null){
    String username = user.getUsername();
}

Also, here is a nice, brief run-through of common session utilization with Servlets and HttpSession: Session Tracking

answered Apr 19, 2016 at 21:46

pczeus

7,8864 gold badges38 silver badges54 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

surlistyc Over a year ago

Jesus... I've been "learning" Java for about 2 years now, and one thing that slipped my mind for the project was being able to; User someUser = (User)session.getAttribute("user"); That was the key that I was missing. I forgot to mention that User IS serializable and I apologize for that. All in all, this was exactly what I needed, and THANK YOU for the concise information!

Collectives™ on Stack Overflow

Java Servlet how to get a specific value from a session attribute

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related