Sending and splitting an image file over tcp socket.

[busdude]

I am trying to write a server and client, where the server has an image file (hardcoded name), that is to be split into 512 byte packets and sent to a client who responds to each packet with an "ACK" message. The client is supposed to assemble these packets into an image file. Currently the code I have is giving problems, I don't now how to modify it.

The size of the image is 3092 bytes meaning the server should send about 6 packets and print "ack received" if the packet was received and acknowledged by the client, but it seems to only be printing it twice.

server code contains

public static void main(String[] args) throws Exception
	{
	ServerSocket inSocket = new ServerSocket(40075);
	System.out.println("made socket");
	
	String clientSentence;
	
	while(true)
	{
	Socket sSocket = inSocket.accept();
	System.out.println("accepted socket");
	BufferedReader fromclient = new BufferedReader(new InputStreamReader(sSocket.getInputStream()));
	
		DataOutputStream toClient = new DataOutputStream(sSocket.getOutputStream());
		clientSentence = fromclient.readLine();
		System.out.println(clientSentence);
		
		File jfile = new File("base.jpg");
		if (!jfile.exists() || !jfile.isFile())
		{
			System.out.println("Not a file");
		}
		else System.out.println("Is a file");
		
		int filesize = (int)jfile.length();
		
		int left = filesize;
		int byteposition = 0;
		System.out.println(filesize);
		
		DataInputStream fis = new DataInputStream(new FileInputStream(jfile));
		byte[] buffer = new byte[filesize];
		while(left > 512)
		{
		try {
				while(fis.read(buffer)!=-1)
				{
					toClient.write(buffer, byteposition, 512);
				}
				System.out.println("After writing");
				clientSentence = fromclient.readLine();
				if (clientSentence.equals("ACK"));
				System.out.println("ack received");
				
		}
		catch (Exception e){}			
		byteposition = byteposition + 512;
		left = left - 512;
	}
	
	}
	}

client code contains

			       
			       System.out.println("pre server socket");
			       Socket clSocket = new Socket(addr,40075);
			       System.out.println("post server socket");
			       DataOutputStream toPserver = new DataOutputStream(clSocket.getOutputStream());
			       DataInputStream fromPserver = new DataInputStream(clSocket.getInputStream());
			       toPserver.writeBytes(filereq);
			       String pReply = fromPserver.readLine();
			       System.out.println(pReply);
			       
			       File dlfile = new File("new"+name);
			       dlfile.createNewFile();
			       int gotbytes = 0;
			       
			       DataOutputStream dos = new DataOutputStream(new FileOutputStream(dlfile));
			       
			       while(gotbytes < 3092)
			       {
			       try
			       {
			    	   while(fromPserver.available() > 0)
			    	   {
			    		   dos.writeByte(fromPserver.readByte());
			    		   gotbytes = gotbytes + 1;			    		   
			    	   }			    	   			    	   
			       }
			       catch (Exception e){}
			       toPserver.writeBytes("ACK");
			  }     
			       System.out.println(gotbytes);			       
			       clSocket.close();  
			}

[masijade]

FYI Cross-post