How to track no of bytes transferred

Question

Hi there,
how to track no of bytes transferred
while downloading a file using java servlets.
please note that i am not writing any client side application like applet...
Hence I want to track no of bytes transffered to client end from my server (using servlets)
Please kindly help me out as soon as possible.
awaiting the solution immediately.
thanks,
venkat

Answer 1

//the following is the code what i have written in my servlet.
res.setContentType(MIME); // I hava parameterised the MIME tag
OutputStream out=res.getOutputStream();
int counter=0;
File f1 = new File("c:/x.pdf");
//int k=(int)f1.length();
fis = new FileInputStream(f1);
byte[] buffer=new byte[fis.available()];
fis.read(buffer);
for(i=0; i<buffer.length; i++)
try
counter=i+1; //getting the number of bytes got transferred
out.write(buffer,i,1); //write to client's directory
catch(IOException ex)
System.out.println("exception while download="+ex.getMessage());
downloaded=true;
if(counter!=buffer.length)
download_error="Not Downloaded";
download=false;
//while executing the above servlet, the servlet prompts for a save as dialog (without file extension, please note I have specified the MIME tag also).
Now the client is entering the file and clicking save
In between he cancels and file is not downloaded to the client's directory.
Now the counter length should not match with the buffer.length, but it is matching exactly and stating that the file has been downloaded properly.
I hope you would have understood my problem.
Also note that I dont have any client side application to monitor the download.
Please let me know how to solve the problem as soon as possible
expecting your reply at the earliest thanks.