What is the role of a servlet filter in security?
- Handle HTTP Requests
- Manage Database Connections
- Manipulate Session Attributes
- Process Security Policies
A servlet filter plays a crucial role in security by processing security policies. It can inspect and manipulate both the request and response to enforce security measures before reaching the servlet.
How should an HTTP servlet respond to a request with an If-Modified-Since header older than the content's last modification date?
- Return a 200 OK response with the updated content
- Return a 304 Not Modified response
- Return a 403 Forbidden response
- Return a 500 Internal Server Error response
If the If-Modified-Since header indicates that the content hasn't been modified since the provided date, the servlet should return a 304 Not Modified response to indicate that the client's cached copy is still valid.
A web application requires users to log in for access. Which servlet feature should be implemented for this requirement?
- Filter
- HttpSession
- RequestDispatcher
- ServletContext
The HttpSession feature in servlets is commonly used for session management, allowing the tracking and management of user sessions, which is essential for implementing user logins in web applications.
In a scenario where sensitive data is transmitted, which protocol should a servlet use to ensure data security?
- FTP
- HTTP
- HTTPS
- SMTP
For transmitting sensitive data, such as during user logins, servlets should use HTTPS (HTTP Secure) to ensure data security through encryption.
For an application that needs to authenticate users based on roles, what is the best approach to implement this in servlets?
- Container-Managed Security
- Custom Authentication Logic
- Database Authentication
- SSL Authentication
The best approach for implementing user authentication based on roles in servlets is to use Container-Managed Security, which is configured in the deployment descriptor (web.xml) and utilizes the container's security mechanisms.
How are requests forwarded from servlets to the appropriate view in an MVC framework?
- Forward
- Include
- Redirect
- Response.sendRedirect()
Requests from servlets to the appropriate view in an MVC framework are forwarded using the Forward mechanism, allowing seamless interaction between the controller and the view components.
What role do servlets play in handling controller logic in MVC frameworks?
- Servlets are responsible for rendering views in MVC frameworks.
- Servlets handle the controller logic by processing and managing user requests.
- Servlets manage database connections in MVC architectures.
- Servlets primarily focus on handling presentation logic in MVC.
Servlets play a crucial role in handling controller logic by processing and managing user requests, directing them to the appropriate components in the MVC architecture.
In MVC architecture, how does a servlet interact with the model to process business logic?
- Servlets communicate with the model through JavaBeans or other business logic components.
- Servlets directly manipulate the model by interacting with the database.
- Servlets have no interaction with the model in MVC.
- Servlets use JSPs exclusively to handle business logic in MVC.
Servlets interact with the model by communicating through JavaBeans or other dedicated business logic components to process business logic in an MVC application.
How are servlets used in conjunction with JSPs in a typical MVC application?
- Servlets and JSPs are interchangeable and can be used for any MVC role.
- Servlets and JSPs are not used together in MVC applications.
- Servlets handle business logic, and JSPs handle presentation logic.
- Servlets handle presentation logic, and JSPs handle controller logic.
In a typical MVC application, servlets are often used to handle business logic, while JSPs are used for presentation logic. Servlets and JSPs work together to achieve a separation of concerns in MVC.
How can servlets be effectively used to implement the front controller pattern in an MVC application?
- Delegate control to JSP pages
- Directly connect the servlets to the database
- Implement a central servlet that handles all incoming requests
- Use multiple servlets for each controller action
Servlets can effectively implement the front controller pattern by having a central servlet that handles all incoming requests, allowing for a centralized point to manage request handling in an MVC architecture.