Write a jsp page for login page
When you click on logout button you go back to login page. Code Line Here we are taking if condition where we check any of the parameters which are fetched from request as whether they are empty or not.
Write a jsp page for login page
This session will be valid till the user session expires. In this example, we have taken Login form where we have two fields "username" and "password" with a submit button. In addition, it has to update the Bean's data that will be used later by the servlet. If you have many registered users in your website or system. In addition, it sets the "valid" attribute of the bean to true. Now we compare the user obtained user name and password with the correct credentials which is anurag username and jain password. The professional practice of this step is to apply the validation with the records available in the database e. HttpServletRequest; import javax. If valid, the servlet will Add the bean as an attribute to the session. If credential are correct we show the home page otherwise we call the error page Now we will code the home page: Listing 3: Home. ServletException; import javax.
Beans are normal java classes containing Attributes Getters and Setters for such attributes and may be some additional methods In our application, Beans are used to save data needed in the application in the form of variables.
In case of valid username and password, the DAO fills the bean with the rest of the user's information that will need to be displayed later by the JSP first and last names.
It is also responsible for setting and updating data saved in the bean, which will be used later by the DAO.
Our UserBean is a class representing the User table in our Database where each column in the user table has a corresponding instance variable with a setter and a getter method.
This data may be a representation of data existing in the DB, data entered by the user, or results of business logic. So that when control comes to this page then user session is killed and if he retries to enter home.
Student registration form using jsp servlet
In page directive we added a new attribute called errorPage. As mentioned in the application description, the user will have to enter his username and password, so first of all, we need a JSP that asks the user to input his username and password in their corresponding fields. Code Line Here we have a welcome message with the username. At the end, after all the validation checks are passed successfully, new JSP attribute is added to the current session with the value of username parameter. Here we are also including request and response objects. The user login status is usually checked in the header section. Throughout the navigation of the website pages, we can continuously check the availability of the username attribute to confirm if the current user is logged-in note: each user has its own session which usually expires within 30 minutes in most of the web-servers. The source code is commented in details, so that can understand every statement's role. Otherwise, the DAO sets the "valid" attribute of the bean to false Now we know if the user was registered or not Finally, the Servlet will check the validity of the user by reading the valid attribute of the bean and redirect to the appropriate JSP. It is also responsible for setting and updating data saved in the bean, which will be used later by the DAO.
We will discuss more about exciting things in coming articles.
based on 68 review