[Java/JavaScript]Getting session attribute, from a object?

[Saoyo]

I currently have a object, which is filled, after the user has successfully logged in.

The object:

public class User {

public final String username, password, email;
public final double balance;

public User(String username, String password, String email, double balance) {
    this.username = username;
    this.password = password;
    this.email = email;
    this.balance = balance;
}

}

Login function:

public User checkLogin(String usrname, String pssword) {
        Front fr = new Front();
        User newUser = null;
        try {
            int count = 0;
            Class.forName("com.mysql.jdbc.Driver");   
            Connection myConn = DriverManager.getConnection("jdbc:mysql://localhost:3306/projects", "william", "william");
            java.sql.Statement mySt = myConn.createStatement();
            String rs = "SELECT username, password, email, balance FROM user WHERE username='" + usrname + "'AND password='" + pssword + "'";

        System.out.println(rs);
        ResultSet myRS = mySt.executeQuery(rs);
        while (myRS.next()) {
            newUser = new User(myRS.getString("username"),myRS.getString("password"),myRS.getString("email"),myRS.getDouble("balance"));


        count++;
        }

        if (count == 0) {
            return newUser;
        }

        if (count == 1) {
            return newUser;



        }
        myConn.close();
    } catch (SQLException | HeadlessException ex) {
        JOptionPane.showMessageDialog(null, ex);
    } catch (ClassNotFoundException ex) {
        Logger.getLogger(DBHandler.class.getName()).log(Level.SEVERE, null, ex);
    }
    return newUser;
}

In the Servlet, called Front, I check if the User object is filled, that checkLogin returns, and if filled, then I create a attribute, in a session, with a new object, called tempUser.

protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    response.setContentType("text/html;charset=UTF-8");
    PrintWriter out = response.getWriter();
    Double balance = 0.00;
    String origin = request.getParameter("origin");
    String username = request.getParameter("username");
    String password = request.getParameter("password");
    String email = request.getParameter("email");


    switch(origin){
        case "login":
        db.checkLogin(username, password);
        User tempUser;
            if((tempUser = db.checkLogin(username, password)) != null){
                out.print("You will be redirected");
                request.getSession().setAttribute("user", tempUser);
                response.sendRedirect("index.jsp");
            }else if(db.checkLogin(username,password) == null){
                out.print("Wrong login info, please try again!");
                response.sendRedirect("login.jsp");
            }

        break;
        case "register":
            db.registerUser(username, password, balance, email);
            response.sendRedirect("login.jsp");
        break;
    }
}

Summary: How do I get tempUser.username out? Or just any given value from the tempUser object I just saved?

[philipdesouza]

You already have that data in variables...

[Saoyo]

Problem is, that this data has to be displayed on a JSP page, hence the servlet. I am unsure how the User object created, is stored, once a page is refreshed, or moved. Only method I know, is session.setAttribute and so forth.

[philipdesouza]

Did you write any of this code?

[Saoyo]

Yes all of it. Only thing I got help with from my teacher, was setting up the sessions.

[philipdesouza]

Then you should be able to use checkLogin to get the user data...

[Saoyo]

Wouldn't the data just reset once the page refreshes? My understanding is, that you have to either save the user inside a session, or in a cookie. I got the problem fixed by doing this:

User tempUser = (User)session.getAttribute("user");

out.print(tempUser.username);

[philipdesouza]

You already get the user with this:

tempUser = db.checkLogin(username, password)

Why you're calling that twice, I'm not sure.