Multiple reads from DataInputStream through Socket

Question

Ok I got a small prob, and well, here it is:
I have a server and a client.
The client needs to send a file to the server.
I'm using Data(Input/Output)Stream.
I use writeLong() and readLong(), to send the size and after that read the size of the file.
And after that I send the file.
But the file is always corrupted, but if I leave the size sending part out and enter the size hardcoded it works fine!
Here's a small snippet from the server-code.
// Read the filesize.
long fileSize = in.readLong();
// Receive and save the file.
int bytesRead = 0;
int bytesToRead = 1024;
byte[] input = new byte[bytesToRead];
while(bytesRead < fileSize) {
     int result = in.read(input,0,bytesToRead);
     if(result == -1) break;                              
     bytesRead += result;
     out.write(input,0,bytesToRead);
     System.out.println(bytesRead + "/" + fileSize);
in.close();
out.flush();
out.close();Any help is very appriciated...
Thnkx in advance...
Robert.

Answer 1

I'm assuming out is a file. I think you are writing too much. You want to write what was read in, not the full array. The default values of the byte array bytes is 0 (or since not being reset, the last value read). So say you read in a lot of bytes in one read call, then a few in the 2nd, and then more in the 3rd, you are writing some old data (from 1st read) in the 2nd write, which will corrupt the file. Somehow I doubt that it's always the case that withouth the readLong part that it doesn't work. Just a fluke thing that happens any particular time.
// Read the filesize.
long fileSize = in.readLong();
// Receive and save the file.
long bytesRead = 0;
int bytesToRead = 1024;
byte[] input = new byte[bytesToRead];
while(bytesRead < fileSize) {
     int result = in.read(input,0,bytesToRead);
     if(result == -1) break;                              
     bytesRead += result;
     out.write(input,0,result);
     System.out.println(bytesRead + "/" + fileSize);
in.close();
out.flush();
out.close();