Bytes per Second

Question

Dear Reader,
I have made my simple download utility program in java.
In there i can count the number of bytes downloaded.
--Problem i am facing is to get bytes per second of the download in progress.
For this purpose i take system time at definite intervals(one or two seconds) and count
the bytes downloaded in that specific intervals.
Doing so slows down the speed of the program(execution speed).
If you have any alternative to get bytes per second which does not consume time please
notify...
Thank you

Answer 1

Make sure you don't have a lot of System.out.prints when you calculate the speed, and instead of reading just one byte at the time, you could read x bytes at the time using a byte array.
byte[] buffer = new byte[1024];
long start = System.currentTimeMillis();
long bytesRead = 0;
int len;
while (System.currentTimeMillis()-start < 2000 && (len = in.read(buffer)) != -1) {
  bytesRead += len;
  // ... do something with the read bytes.
  // Valid bytes are in the buffer from index 0 to len-1, the rest is garbage
long rate = 1000*bytesRead/(System.currentTimeMillis()-start);
System.out.println("Current rate is: "+rate);Something like that..