Web Programming

Todo Web Application (Sessions)

The objective of this exercise is to use sessions for user logins.

Tasks

1. Create the server page login.jsp which contains a form that allows a user to log in or to register. (Hint: Use the value attribute of the submit buttons to distinguish the two actions.)
2. Implement the UserAdminServlet that uses the user service to provide the following methods:
   • doGet forwards the request to the todo list if a user is logged in; otherwise, it forwards it to the login page
   • doPost logs in or registers a user: on success, a session with the username is created and the browser is redirected to the todo list; on failure, an error message is displayed on the login page
   Make the servlet available at the path /userAdmin.
3. Modify the TodoListServlet and the NewTodoServlet so that they use the todos of the logged-in user stored in the session.
4. Define userAdmin (without slash) as welcome file in the deployment descriptor web.xml.
5. (Optional) Add the name of the logged-in user to the title of the server page todoList.jsp.
6. (Optional) Add a button to the sever page todoList.jsp that sends a logout request to the UserAdminServlet which invalidates the session.

Solution