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.
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.
To manage memory efficiently during file upload, using a __________ approach is recommended.
- buffering
- random access
- sequential
- streaming
To manage memory efficiently during file upload, a streaming approach is recommended, allowing the servlet to process the file in chunks rather than loading the entire file into memory.
A servlet is configured to allow only specific file types for upload. What strategies should be implemented to ensure this?
- Rely on the web browser for file type validation
- Use a third-party library for file type validation
- Validate file types on the client side
- Validate file types on the server side
Validating file types on the server side is a more secure approach to ensure that only specific file types are allowed for upload. Relying solely on client-side validation can be bypassed, so it's not recommended. Using a third-party library can also provide robust validation.
Describe a scenario where file download in a servlet might fail and how to address it.
- Incomplete file on the server
- Incorrect file path in the servlet configuration
- Insufficient permissions to read the file
- All of the above
Various factors such as an incomplete file on the server, an incorrect file path in the servlet configuration, or insufficient permissions can lead to file download failure. Addressing all these issues collectively (option 4) provides a comprehensive solution to potential download failures.
In a case where file uploads are taking too long, what are potential causes and solutions?
- Large file size
- Slow network connection
- Insufficient server resources
- All of the above
Potential causes for slow file uploads can include a large file size, a slow network connection, or insufficient server resources. Addressing all these factors collectively (option 4) can help optimize file upload performance.