Start reading in middle of FileInputStream

Question

Hi,
I have a file uploader that i want to implement the functionality to be able to resume failed uploads. I am using a FileInputStream and reading from that into a buffer before uploading(see code below)
FileInputStream in =  new FileInputStream(file);
int nread;
byte[] buf = new byte[2048];
while((nread = in.read(buf, 0, buf.length)) >= 0) {
          //upload to server here
          out.write(buf, 0, nread);
}What i want to do is to be able to start reading somewhere in the FileInputStream object, not have to start at the beginning everytime. So for example if the file uploaded 1000 bytes out of a total 2500 bytes I want to be able to start reading from the inputstream at the 1000 byte point.
If anyone knows how to acomplish this I would be very grateful
Thanks

Answer 1

sabre150 wrote:
You need to skip to the point you want to restart from. Read the Javadoc for InputStream.skip(long ) and make sure you cover the condition where the actual number of bytes skipped is not what you asked for.I was mistakenly under the impression that RandomAccessFile would perform better.
After some benchmarking on a 500M file on my Windows XP machine, I found no significant
difference, so OP, go with sabre's suggestion.