Usage of BufferedInputStream & OutputStream#flush()

Question

I have a snippet below.
InputStream fileInputStream = formFile.getInputStream();//org.apache.struts.upload.FormFile
OutputStream out = = new BufferedOutputStream(new FileOutputStream(tempFilePath));
byte[] buffer = new byte[256 * 1024];
int contentLength;
while ((contentLength = fileInputStream.read(buffer)) > 0) {
out.write(buffer, 0, contentLength);
out.close();
fileInputStream.close();1. Should I use BufferedInputStream wrapping around formFile.getInputStream() ? I upload huge size files, say > 500 MB.
2. Should I really call out.flush() somewhere ? If yes, should it be inside while loop or after while loop ?
thanks in advance.

Answer 1

baskark wrote:
Otherwise, there's no need to call it. If you're already done writing, you'll call close(), and that will call flush() anyway. If you're writing all of the data in chunks one right after the other, and not stopping to do other processing between chunks, then you'll be writing as fast as possible and calling close() right away anyway, so, again, no benefit to calling flush.Will calling flush() before calling next write() make a difference in performance ?Calling flush unnecessarily could potentially slow things down, but you'd probably have to do a lot of it to be noticeable.
Also using BufferedInputStream wrapping around formFile.getInputStream() improves performance in anyway ?If you're reading in large chunks with read(byte[]), it probably won't make a difference. But if you're reading into a very small byte array, or reading one byte at a time with read(), then using the BufferedInputStream will be baster.