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.
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.
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.
Which HTTP header can be used to mitigate some types of XSS attacks?
- Content-Security-Policy
- Strict-Transport-Security
- X-Content-Type-Options
- X-Frame-Options
The Content-Security-Policy (CSP) header can be used to mitigate some types of XSS attacks by defining and controlling the sources from which certain types of content can be loaded.
How do you set a response header to indicate the content should be downloaded as a file?
- response.setHeader("Content-Disposition", "attachment; filename=example.txt");
- response.setHeader("Content-Encoding", "gzip");
- response.setHeader("Content-Transfer-Encoding", "binary");
- response.setHeader("Content-Type", "application/octet-stream");
To indicate that the content should be downloaded as a file, you can use the response.setHeader("Content-Disposition", "attachment; filename=example.txt"); method.
In the context of XSS prevention, what does the acronym CSP stand for?
- Content-Security-Policy
- Content-Security-Protocol
- Cookie-Security-Protocol
- Cross-Site Policy
In the context of XSS prevention, CSP stands for Content-Security-Policy. It is a security header that helps prevent XSS attacks by specifying which content can be executed on a web page.