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.
Which HTTP status code is typically sent by an HTTP servlet to indicate a successful response?
- 200 OK
- 302 Found
- 404 Not Found
- 500 Internal Server Error
The HTTP status code 200 OK is typically sent by an HTTP servlet to indicate a successful response. This status code signals that the request has been successfully processed, and the server is returning the requested resource.
For a file upload, the request type must be __________.
- FILE
- GET
- POST
- UPLOAD
For a file upload, the request type must be POST.
To read uploaded files in a servlet, the __________ method is commonly used.
- doGet()
- doPost()
- init()
- service()
To read uploaded files in a servlet, the doPost() method is commonly used.
The response header __________ is crucial for indicating a file download rather than display.
- Content-Type
- File-Disposition
- File-Type
- Response-Content
The response header Content-Disposition is crucial for indicating a file download rather than display.
For secure file uploads, validating the __________ and __________ of the file is essential.
- file name, content
- file name, size
- file type, content
- file type, size
For secure file uploads, it's essential to validate both the file type and content to ensure the uploaded file is safe and meets the required criteria.
To handle multiple file uploads, a servlet may use the __________ API.
- Java Authentication and Authorization Service (JAAS)
- Java Naming and Directory Interface (JNDI)
- JavaBeans Activation Framework (JAF)
- JavaMail
To handle multiple file uploads, a servlet may use the JavaBeans Activation Framework (JAF) API to work with various types of data, including files.