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.
In an advanced MVC framework, how is the decision made in a servlet to select a specific view based on business logic?
- All views are pre-defined in a configuration file
- Views are dynamically determined based on business logic
- Views are hardcoded in the servlet
- Views are randomly selected
In an advanced MVC framework, the decision to select a specific view is often based on dynamic business logic, allowing for flexibility in choosing views based on the outcome of the application's processing.
How do servlet filters complement the MVC architecture in web applications?
- Filters can preprocess requests and post-process responses, adding a layer of functionality
- Filters cannot be integrated with MVC architecture
- Filters handle only authentication tasks
- Filters replace the need for controllers in MVC
Servlet filters complement the MVC architecture by providing a mechanism to preprocess requests and post-process responses. They add a layer of functionality that can be applied across multiple components, enhancing the flexibility of the MVC design.
To maintain a separation of concerns, servlets in MVC should not directly manipulate the __________.
- Controller
- Database
- Model
- View
To maintain a separation of concerns, servlets in MVC should not directly manipulate the Controller.
The __________ method in servlets is often used to dispatch requests to different handlers in an MVC framework.
- doDispatch()
- doPost()
- init()
- service()
The doDispatch() method in servlets is often used to dispatch requests to different handlers in an MVC framework.
In a complex web application using MVC and servlets, a new feature requires integration of a third-party service. Where should this integration primarily take place?
- In a separate utility class
- In the Controller
- In the Model
- In the View
In MVC architecture, business logic, including third-party service integration, is primarily handled in the Controller. This ensures separation of concerns and makes the application more modular.
A web application needs to redirect the user to different pages based on their role. How should this logic be implemented using servlets in MVC?
- In the Controller
- In the Model
- In the View
- Using servlet filters
The logic for redirecting users based on their role should be implemented in the Controller. The Controller handles the application's flow and decides which view to render based on the user's role.
A servlet is configured with specific initialization parameters. How does this impact the servlet's processing of requests?
- The parameters are accessible using the getInitParameter() method within the servlet.
- The parameters are accessible using the request.getParameter() method.
- The parameters are automatically injected into the servlet methods.
- The parameters are only accessible in the doPost() method.
When a servlet is configured with specific initialization parameters, these parameters can be accessed within the servlet using the getInitParameter() method, allowing customization of the servlet's behavior based on the configuration.
When optimizing an MVC application for performance, where should caching strategies be implemented in relation to servlets?
- In a separate caching layer
- In the Controller
- In the Model
- In the View
Caching strategies, for optimizing performance, should be implemented in the Model. The Model is responsible for data access and processing, making it an appropriate place to introduce caching mechanisms.
What is the primary purpose of encoding user input in web applications?
- To enhance the performance of the application
- To improve the user experience
- To prevent security vulnerabilities like XSS
- To simplify code implementation
The primary purpose of encoding user input is to prevent security vulnerabilities, such as Cross-Site Scripting (XSS), by ensuring that user input is treated as data, not executable code.