#need help in java ee sessions

44 messages · Page 1 of 1 (latest)

trim mesaBOT
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mortal bobcat
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Are you writing a servlet?

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If so you can get the session from request.getSession()

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Oh ok you got it

haughty island
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i want to save first name and last one

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session.setAttribute("first_name", first_name);

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here

mortal bobcat
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Looks like you're already doing the first name

haughty island
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but i want to put many first and last names

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and then print them all together

mortal bobcat
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How about wrapping in a User object then adding a list of Users to the session

haughty island
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first name | last name
first name | last name
first name | last name
first name | last name

mortal bobcat
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public class User {
    private final String firstName;
    private final String lastName;

    public User(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }
}
haughty island
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yes

mortal bobcat
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Then manage a list of Users to the session

haughty island
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and then i will save them in list

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ty

mortal bobcat
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Yeah

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No probs

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Close post when done

haughty island
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package servlets;

import dao.Student;
import dao.StudentDAO;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

@WebServlet(name = "CreateServlet", value = "/create")
public class AddServlet extends HttpServlet {
    List<Student> students = null;
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String first_name = request.getParameter("first_name");
        String last_name = request.getParameter("last_name");
        if (first_name != null && last_name != null) {
            try {
                HttpSession session = request.getSession();
                students = (List<Student>) session.getAttribute("listStudent");
                Student s = new Student(first_name,last_name);
                students.add(s);
                session.setAttribute("listStudent", students);
            } catch (Exception e) {
                response.sendError(HttpServletResponse.SC_BAD_REQUEST);
            }

        }

        response.sendRedirect(request.getContextPath() + "/show");
    }
}
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@mortal bobcat like this right?

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and also when the user enters the website for the first type listStudent won't be created

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so where do i create it?

mortal bobcat
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So you have to check if it's null and if so set it

haughty island
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HttpSession session = request.getSession();
students = (List<Student>) session.getAttribute("listStudent");
if (students == null) {
session.setAttribute("listStudent", students);
}
Student s = new Student(first_name,last_name);
students.add(s);
session.setAttribute("listStudent", students);

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@mortal bobcat like this?

mortal bobcat
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No because it will still be null

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If students is null you want to set it to a new list in the session

haughty island
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i mean

mortal bobcat
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You will because students will always be null

haughty island
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not found

haughty island
haughty island
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cant really understand what to do

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i found this

mortal bobcat
haughty island
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ok

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ty

trim mesaBOT
#

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