Which of the following is a recommended approach to handle database connections in servlets?
- Closing connections after each request
- Connection pooling
- Opening new connections for each request
- Using a singleton connection
Connection pooling is a recommended approach for handling database connections in servlets, as it optimizes resource usage and enhances performance.
Why is it important to close resources like database connections in servlets?
- All of the above
- To avoid memory leaks
- To conserve memory
- To improve performance
Closing resources like database connections is important to avoid memory leaks and ensure efficient memory usage in servlets.
How does using the PreparedStatement in servlets improve performance?
- PreparedStatements allow for batch processing.
- PreparedStatements are precompiled, reducing SQL parsing overhead.
- PreparedStatements are suitable for handling large datasets.
- PreparedStatements automatically manage database connections.
Using PreparedStatements in servlets improves performance as they are precompiled, reducing SQL parsing overhead, which leads to better execution speed.
How does the sendRedirect() method communicate the new URL to the client's browser?
- Via HTTP headers
- Via HTTP status code
- Via URL parameters
- Via server-side cookies
The sendRedirect() method communicates the new URL to the client's browser by sending an HTTP redirect response with the new URL in the HTTP headers.
What is the benefit of implementing the SingleThreadModel interface in servlets?
- Enhanced concurrent processing.
- Improved thread safety.
- Reduced memory consumption.
- Simplified servlet lifecycle.
Implementing the SingleThreadModel interface in servlets provides improved thread safety by ensuring that only one thread can execute the service method at a time, preventing concurrent access issues.
Describe how a servlet can process AJAX requests using GET and POST methods.
- Both doGet and doPost methods
- Use a separate servlet for AJAX
- Use only doGet method
- Use only doPost method
A servlet can process AJAX requests using both the doGet and doPost methods. The choice depends on the nature of the AJAX request and the type of data being sent. Using both methods allows flexibility in handling various types of AJAX requests within the same servlet.
How does implementing gzip compression for responses optimize servlet performance?
- Has no impact on response size
- Improves servlet security
- Increases response size, causing longer download times
- Reduces response size, minimizing network latency
Implementing gzip compression for responses in servlets optimizes performance by reducing response size, minimizing network latency, and improving overall user experience during data transfer.
To optimize performance, a servlet should cache frequently used data in the ________.
- Database
- Request
- ServletContext
- Session
To optimize performance, a servlet should cache frequently used data in the ServletContext to make it available to all components of the web application.
In HTTP servlets, which method is commonly used for handling form submissions?
- doGet()
- doPost()
- init()
- service()
The doPost() method in HTTP servlets is commonly used for handling form submissions as it is designed for processing data sent in the body of an HTTP POST request.
To minimize server load, servlets can implement _________ to handle asynchronous processing.
- Asynchronous Servlets
- Listeners
- Synchronization
- Threads
To minimize server load, servlets can implement Asynchronous Servlets to handle asynchronous processing and improve the overall scalability of the application.