Servlet Program For A Login Page
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In this section we are going to discuss the implementation of a complete Login application (We received the source code of this application through Amira Thabet) The application will. Ask the user to input his 'username' and 'password'.
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Here's a simple way to create a simple login form using html and authenticate using java servlet and mysql database. Read the tutorial to know more.
Check the existence of this user in the Data Base. If exists, Retrieve his first name and last name from the DB and display them. If not registered, Display 'Sorry, you are not registered' You are assumed to know about the connection between java and DB. This Login application uses the so called 'JavaBeans' and 'DAOs' - standing for Data Access Objects - to handle the interactions with the DB. 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).
This data may be a representation of data existing in the DB, data entered by the user, or results of business logic. DAOs are objects responsible for handling the interactions with the Data Source, through implementing the access mechanism required to work with the data source. In our application the DAO is responsible for.
Reading data from the Bean (data entered by the user) and checking its consistency with the DB - use Getters to get values of variables from the bean-. Retrieving data from the DB and saving it to the Bean - use Setter methods to set values to variables - You can either go to the Next page to step by step implement the example, or download its source code from. The source code is commented in details, so that can understand every statement's role. Finally, we are done with the logic and accessing the DB. So back to the interface, we need two JSPs; one for the valid login and another for the invalid.