How to Validate Username and Password from Database in Servlet

Validating Username and Password in Servlet

When it comes to building secure web applications, validating usernames and passwords is a critical step. In a Java Servlet environment, here is how you can validate the credentials from a database:

1. Establish a connection to the database using JDBC.
2. Retrieve the username and password entered by the user from the request.
3. Query the database to fetch the user's details based on the provided username.
4. Compare the retrieved password with the password entered by the user.
5. If the passwords match, the user is authenticated; otherwise, authentication fails.

It's essential to handle exceptions, close database connections, and use secure practices like parameterized queries to prevent SQL injection attacks.