In a situation where multiple asynchronous tasks are initiated by a servlet, how is the completion of these tasks managed?
- Each asynchronous task manages its completion independently.
- The servlet prioritizes tasks based on their initiation order.
- The servlet waits for all tasks to complete before proceeding.
- The tasks are completed in a random order.
Each asynchronous task manages its completion independently, allowing them to finish in parallel without waiting for others to complete.
How would you handle errors and timeouts in an asynchronous servlet operation?
- Errors and timeouts are ignored in asynchronous operations.
- Handle errors centrally in the servlet by implementing error listeners.
- Throw exceptions from the servlet to handle errors.
- Use error handling within each asynchronous task.
Errors and timeouts in asynchronous servlet operations are typically handled within each task, allowing for specific error-handling strategies for each asynchronous process.
Which method is typically used for file uploads in a servlet?
- doGet()
- doPost()
- init()
- service()
The doPost() method is typically used for file uploads in a servlet as it is designed to handle HTTP POST requests, commonly used for submitting forms and uploading files.
What is the primary interface used for file upload in servlets?
- FileHandler
- FileUpload
- ServletFileUpload
- UploadManager
The primary interface used for file upload in servlets is ServletFileUpload. It provides a simple way to parse and process HTTP requests with content type multipart/form-data.
For file download, what Content-Type should be set in the servlet response?
- application/json
- application/octet-stream
- image/png
- text/html
For file download, the Content-Type in the servlet response should be set to application/octet-stream to indicate that the response contains binary data without any specific format.
What must be done to ensure the safe and correct download of files with different character encodings?
- Encode files as ASCII
- Set the character encoding in the response header
- Use a fixed character encoding
- Use the default character encoding
To ensure the safe and correct download of files with different character encodings, set the character encoding in the response header using response.setCharacterEncoding().
What are the security concerns to consider while implementing file upload in servlets?
- All of the above
- Checking file size
- Securing file storage location
- Validating file types
When implementing file upload in servlets, it's crucial to consider security concerns such as validating file types, checking file size, and securing the file storage location to prevent vulnerabilities.
How can a servlet efficiently handle large file uploads without running out of memory?
- Compress the file
- Increase heap memory
- Split the file into chunks
- Use streaming API
To handle large file uploads efficiently, a servlet can use streaming APIs to process the file in smaller chunks, avoiding memory overflow. Increasing heap memory may not be a scalable solution, and splitting the file into chunks is a better approach.
What is the role of the Content-Disposition header in file downloading?
- Indicates the file size
- Manages file encryption
- Prompts for download
- Specifies the file type
The Content-Disposition header plays a crucial role in file downloading by prompting the browser to download the file instead of displaying it. It specifies the disposition of the content, ensuring a proper download experience for users.
For a file upload, the request type must be __________.
- FILE
- GET
- POST
- UPLOAD
For a file upload, the request type must be POST.