Sending file in chunks in Java

Question

I got this client application that sends my file fully to server. But I want it to send file in chunks. Here is my client code:

byte[] fileLength = new byte[(int) file.length()];  

        FileInputStream fis = new FileInputStream(file);  
        BufferedInputStream bis = new BufferedInputStream(fis);

        DataInputStream dis = new DataInputStream(bis);     
        dis.readFully(fileLength, 0, fileLength.length);  

        OutputStream os = socket.getOutputStream();  

        //Sending size of file.
        DataOutputStream dos = new DataOutputStream(os);   
        dos.writeLong(fileLength.length);
        dos.write(fileLength, 0, fileLength.length);     
        dos.flush();  

        socket.close();

So how can I make client send my file in chunks? Thanks in advance.

Why do you want to chunk the data ? A Chunk is generally used when the length of the data to be transmitted is not known in advance. — Santosh
– Santosh, Commented Jul 12, 2012 at 11:32
Also, since you are using raw sockets, if you chunk the data, the server side know should be aware of this or else, use standard HTTP protocol. — Santosh
– Santosh, Commented Jul 12, 2012 at 11:34
@Santosh I think he is just using the wrong title. it is not sending in chunks but rather reading the file in chunks. — user890904
– user890904, Commented Jul 12, 2012 at 11:34
My server already reads data in chunks, i need to chop the file to chunks before sending it, because I cant send huge files that way — Rohit Malish
– Rohit Malish, Commented Jul 12, 2012 at 11:36

yohlulz · Accepted Answer · 2012-07-12 11:39:59Z

3

Try to send the file from client in parts, something like

int count;
byte[] buffer = new byte[8192];
while ((count = in.read(buffer)) > 0)
{
  out.write(buffer, 0, count);
}

and reassemble it on the server.

Apache Commons supports streaming, so it may help.

answered Jul 12, 2012 at 11:39

yohlulz

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5 Comments

Rohit Malish Over a year ago

I already got that in my server side, and it works. I need my clien ( the one that sends the file) to send the file in chunks and not fully

Santosh Over a year ago

@RohitMalish, the example code here actually a client side code.

Rohit Malish Over a year ago

Ok I now tried that code but it sends my files half empty or empty

Rohit Malish Over a year ago

And it also crashes my browser

yohlulz Over a year ago

@RohitMalish Maybe the TCP connection is closed to early by the server and so not all data is transferred. Try socket.shutdownOutput() before socket.close or try to send a message back from the server when a chunk is fully transferred so the client can send another piece. Hope it helps

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