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how to send data in chunks from server and client in java

Posted on 2011-03-07
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Last Modified: 2013-11-23
if the file i request is too large, the client need to wait very long. what does to be modify from my code in order to receive the data in chunks.
e.g. transmit 100MB into 10MB each chunk in order for me to process
int len=0;
        byte [] mybytearray  = new byte [buffer];
        InputStream is = connection.getInputStream();
        FileOutputStream fos = new FileOutputStream("default.amc");
        BufferedOutputStream bos = new BufferedOutputStream(fos);

 while((len=is.read(mybytearray)) > 0)
        {
        	bos.write(mybytearray,0,len);
        	current+=len;
        	
        }
        
         bos.flush();
         long end = System.currentTimeMillis();
         System.out.println(end-start);
         System.out.println(current);
         bos.close();

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Question by:jackson_duffy
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by:objects
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To support sending data in chunks would also require modifying the client to support receive the data in chunks
Changes to the server would be to support specifying the start byte and the number of bytes to send.


>  while((len=is.read(mybytearray)) > 0)

btw, that should be:

 while((len=is.read(mybytearray)) >= 0)
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by:objects
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by:jackson_duffy
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my server side codes are shown below.
with my current codes. i only able to see the received file at the client folder when the file is received fully
Please advise any changes needed. thanks
byte[] bytes = new byte[65536];
                File file = new File("test.txt");
                FileInputStream bis = new FileInputStream(file);
                BufferedInputStream in = new BufferedInputStream(bis);
                OutputStream out = connection.getOutputStream();
                
                DataOutputStream dout = new DataOutputStream(out);
                dout.writeUTF(message);
                //now send the length (as a simple long)
                long numToSend = file.length();
                dout.writeLong(numToSend);
                //now send the file contents
                long numSent = 0;
                while(numSent < numToSend) {
                   long numThisTime = numToSend - numSent;
                   numThisTime = numThisTime < bytes.length ? numThisTime : bytes.length;
                   int numRead = in.read(bytes, 0, (int) numThisTime);
                   if(numRead ==-1 ) break;
                   dout.write(bytes,0,numRead);
                   numSent += numRead;
                }
                out.flush();
                out.close();
                connection.close();

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by:jackson_duffy
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any amends to my codes is needed??
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by:objects
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not sure what you need.
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by:jackson_duffy
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i am sorry.
what i am trying to ask is how to i send and receive file in chunks using a server and client architecture. and what do i have to take note of especially for the server side which is send data and the client side which is to receive data.
as you mentioned, for the send data portion, do the server have to send data in chunks too in order for the client to receive the data in chunks? or what should be done?
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by:objects
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first step would be to design the protocol used by the client and server to communicate. Not much point writing any code until you decide how the two are going to communicate.
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by:jackson_duffy
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the protocol is udp
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objects earned 500 total points
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I meant the application protocol that the client and server will use when communicating.

heres an example od a simple udp client server setup.
http://systembash.com/content/a-simple-java-udp-server-and-udp-client/
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