File transfering using Sockets

can anybody help me to find the simple sample code for file transfering. i m new to java and having problem in client server assignment. sending message (chatting) is done, but i still need file transfering part. only one file at one time is good enough.
thanks.
moe

Since you're asking for help with your homework, I won't give you any code but I will point you in the right direction. Sockets can be used to stream data and files also use sockets. If you put the two together, you'll be able to stream your files between JREs.
Shaun

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Hello,
I need to pass some big amount of data using sockets. I my appliaction I have noticed that sometimes I didn't get all bytes. To check it out I wrote simple client + server to figure out what is happening. So:
- I have a sender and receiver application
- I'm trying to transfer 5MB text file.
- On receiver side, output file is never larget than 3MB
- If I put some timeout on sender side (1ms timeout between write operations) everything works fine.
Could someone tell me what I do wrong? Why data disappears and when? The same file transfered using old sockets goes always fine...
Thanks in advance!
Here is complete source for receiver and sender:
RECEIVER:
import java.io.FileOutputStream;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
public class ReceiverA {
      * @param args
     public static void main(String[] args) {
          String outputFile = "c:\\outputA.txt", host = "127.0.0.1";
          int port = 8001, bufferSize = 10240;
          try {
               ByteBuffer buffer = ByteBuffer.allocate(bufferSize);
               Selector selector = Selector.open();
               ServerSocketChannel server = ServerSocketChannel.open();
               server.configureBlocking(false);
               server.socket().bind(new InetSocketAddress(host, port));
               server.register(selector, SelectionKey.OP_ACCEPT);
               System.out.println("Server started");
               while(true)
                    selector.select();
                    Iterator<SelectionKey> iterator = selector.selectedKeys().iterator();
                    while (iterator.hasNext()) {
                         SelectionKey key = (SelectionKey) iterator.next();
                         iterator.remove();
                         if (key.isAcceptable()) {
                              SocketChannel client = server.accept();
                              client.configureBlocking(false);
                              client.register(selector, SelectionKey.OP_READ);
                              continue;
                         SocketChannel channel = (SocketChannel) key.channel();
                         int counter = 1;
                         if ( key.isReadable() ) {
                              FileOutputStream os = new FileOutputStream(outputFile);
                              int res;
                              do
                                   buffer.clear();
                                   res = channel.read(buffer);
                                   counter += res;
                                   System.out.println(res);
                                   buffer.flip();
                                   os.write(buffer.array(), 0, buffer.limit());
                              while( res >= 0 );
                              channel.close();
                              os.close();
                              System.out.println("Receiver: " + counter);
                              return;
          } catch (Exception e) {
               e.printStackTrace();
}SENDER:
import java.io.FileInputStream;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
public class SenderA {
     public static void main(String[] args) {
          String inputFile = "c:\\inputA.txt" , host = "127.0.0.1";
          int port = 8001, bufferSize = 10240;
          try {
               ByteBuffer buffer = ByteBuffer.allocate(bufferSize);
               byte[] byteArr = new byte[buffer.capacity()];
               Selector selector = Selector.open();
               SocketChannel connectionClient = SocketChannel.open();
               connectionClient.configureBlocking(false);
               connectionClient.connect(new InetSocketAddress(host, port));
               connectionClient.register(selector, SelectionKey.OP_CONNECT);
               while(true) {
                    selector.select();
                    Iterator<SelectionKey> iterator = selector.selectedKeys()
                              .iterator();
                    while (iterator.hasNext()) {
                         SelectionKey key = (SelectionKey) iterator.next();
                         iterator.remove();
                         SocketChannel client = (SocketChannel) key.channel();
                         if (key.isConnectable()) {
                              if (client.isConnectionPending()) {
                                   System.out.println("Trying to finish connection");
                                   try {
                                        client.finishConnect();
                                   } catch (IOException e) {
                                        e.printStackTrace();
                              client.register(selector, SelectionKey.OP_WRITE);
                              continue;
                         if(key.isWritable()) {
                              FileInputStream is = new FileInputStream(inputFile);
                              int res;
                              int counter = 0;
                              do
                                   buffer.clear();
                                   res = is.read(byteArr, 0, byteArr.length);
                                   System.out.println(res);
                                   if ( res == -1 ) break;
                                   counter += res;
                                   buffer.put(byteArr, 0, Math.min(res, buffer.limit()));
                                   buffer.flip();
                                   client.write(buffer);
                                    * When I remove comment file transfer goes OK!
                                   //Thread.sleep(1);
                              while( res != -1 );
                              client.close();
                              is.close();
                              System.out.println("Receiver: " + counter);
                              return;
          catch(Exception e) {
               e.printStackTrace();
}

There are at least two problems here.
A. In the receiver you should test for -1 from the read() immediately, rather than continue with the loop and try to write -1 bytes to the file.
B. In the sender you are ignoring the return value of client.write(), which can be anything from 0 to the buffer length. If you get 0 you should wait for another OP_WRITE to trigger; if you get a 'short write' you need to retry it until you've got nothing left to write from the current buffer, before you read any more data. This is where the data is vanishing.

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Hi there guys,
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<<<<Client Code >>>>
It reads a file input.txt and sends the content over the network to the server.
<<<< Server Code >>>
It reads the incoming data from the client and writes the data out to a file called output.txt
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CLIENT CODE
import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.event.*;
import javax.swing.*;
import java.util.Date;
import java.io.*;
import java.net.*;
class sc {
static final int PORT = 4444;          //Change this to the relevant port
static final String HOST = "127.0.0.1";
     //Change this to the relevant HOST,
//(where Server.java is running)
public static void main(String args[]) {
try {
System.out.print("Sending data...\n");
Socket skt = new Socket(HOST, PORT);
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skt.setSoTimeout ( 2000 );
               skt.setSoKeepAlive(true);
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BufferedInputStream in = new BufferedInputStream(fis);
BufferedOutputStream out = new BufferedOutputStream( skt.getOutputStream() );
//Read, and write the file to the socket
int i;
while ((i = in.read()) != -1) {
out.write(i);
//System.out.println(i);
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out.flush();
out.close();
in.close();
skt.close();
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System.out.print("Error! It didn't work! " + e + "\n");
SERVER CODE
import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.event.*;
import javax.swing.*;
import java.util.Date;
import java.io.*;
import java.net.*;
class ClientWorker implements Runnable {
private Socket client;
ClientWorker(Socket client) {
this.client = client;
public void run(){
try      {
FileOutputStream fos = new FileOutputStream("output.txt");
BufferedOutputStream out = new BufferedOutputStream(fos);
BufferedInputStream in = new BufferedInputStream( client.getInputStream() );
//Read, and write the file to the socket
int i;
while ((i = in.read()) != -1) {
out.write(i);
//System.out.println(i);
System.out.println("Receiving data...");
out.flush();
in.close();
out.close();
client.close();
// srvr.close();
System.out.println("Transfer complete.");
catch(Exception e) {
System.out.print("Error! It didn't work! " + e + "\n");
class ss1 {
ServerSocket server = null;
ss1(){ //Begin Constructor
} //End Constructor
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try{
server = new ServerSocket(4444);
} catch (IOException e) {
System.out.println("Could not listen on port 4444");
System.exit(-1);
while(true){
ClientWorker w;
try{
w = new ClientWorker(server.accept());
Thread t = new Thread(w);
t.start();
} catch (IOException e) {
System.out.println("Accept failed: 4444");
System.exit(-1);
protected void finalize(){
//Objects created in run method are finalized when
//program terminates and thread exits
try{
server.close();
} catch (IOException e) {
System.out.println("Could not close socket");
System.exit(-1);
public static void main(String[] args){
ss1 frame = new ss1();
     frame.listenSocket();
}

............................................. After that I want to
compare and see of the size of input.txt and
serveroutput.txt . If both are same that means that
data has been written reliably to the server.You don't need to do this. TCP/IP ensures the reliable transmition of data. By using a socket you are automaticaly sure that the data is reliably transmitted (Unless there is some sort of exception).
To get the size of the files you can use a File object. Look it up in java.io package in API documentation.
java-code-snippet (without error checking)
File clientFile = new File("input.txt");
clientFile.length();

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ditto
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Hi, i have the following section of code
(of which i am not claiming ownership) which
implements a DCC Send command from irc.
It accomplishes this using sockets, and while
i understand how the code accomplishes what it
does, i need help with a possible modification.
Basically what i am looking to do is keep track
of the progress of the send - so that the
user can at any time see how much of the file
has been sent and how much is remaining.
If anyone has done such a thing in the past or
has a good idea as to how this should be implemented,
i would be greatful for their help.
Here is the code:
new Thread() {
            public void run() {
                try {
                    ServerSocket ss = new ServerSocket(0);
                    ss.setSoTimeout(timeout);
                    int port = ss.getLocalPort();
                    //byte[] ip = ss.getInetAddress().getAddress();
                    byte[] ip = InetAddress.getLocalHost().getAddress();
                    long ipNum = 0;
                    long multiplier = 1;
                    for (int i = 3; i >= 0; i--) {
                        int byteVal = (ip[i] + 256) % 256;
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                        multiplier *= 256;
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You already have the necessary code to find the number of bytes sent at any point during the transmission. You can find out the size of the file by instantiating a RandomAccessFile before you send it, and querying for the file length.
I suggest you make the file size and bytes sent volatile and conveniently accessible to another thread (best implemented here as an inner class?). Your new thread will need to monitor the file transfer at intervals to update the progress indicator. You can generate estimates of time remaining by measuring the average transmission rate, and extrapolating using the total file size. Classically this is done using an average, but you might be better just maintaining a list of fairly recent samples, allowing for the speed swings inherent in internet connections.
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Hi, Srikanth:
Sevaral points.
#1 When posting code, please use the web interface and the >> icon and choose Syntax Highlighting >> Java. Otherwise your code is just too hard to read and gets misformatted.
#2 Apropos of #1, your script as written does not work, because this line:
url=url.replace(/([a-z]*):\/\/([-\._a-z0-9A-Z]*)(:[0-9]*)?\/?(.*)/,"$ 1/$2/$3/$4");
has an extra space in the $1 and should be this:
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Please take an extra moment to make sure that when you asking for help, you do so in a way that makes sense. Otherwise it takes too much effort to help you, and that is frustrating.
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Mon Jul 11 2011 12:06:56 GMT-0400 Read 1024 chars, eof is false
Mon Jul 11 2011 12:06:56 GMT-0400 Read 1024 chars, eof is false
Mon Jul 11 2011 12:06:56 GMT-0400 Read 1024 chars, eof is false
Mon Jul 11 2011 12:06:56 GMT-0400 Read 631 chars, eof is false
Mon Jul 11 2011 12:07:06 GMT-0400 Read 0 chars, eof is false
Result: undefined
Therefore, we can reasonably conclude that the last read at the end of the data stream returns a short read when the other side blocks.
Unfortunately, that's clearly insufficient since you can get short reads all the time.
I'm not sure why you say the length of the file is not known, HTTP provides it to you in the Content-Length field of the response.
But the easy answer is to get the server to close it for you. This is easy, enough, with Connection: close. Why were you specifying
Connection: keep-alive, anyhow?:
            var requestBin =
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            "Host: " + parsedURLBin.address + "\n" +
            "User-Agent: InDesign ExtendScript\n" +
            "Accept: */*\n" +
            //"Connection: keep-alive\n\n";
            "Connection: close\n"+
            "\n";
This yields a nice tidy:
Mon Jul 11 2011 12:26:19 GMT-0400 Read 1024 chars, eof is false
Mon Jul 11 2011 12:26:19 GMT-0400 Read 1024 chars, eof is false
Mon Jul 11 2011 12:26:19 GMT-0400 Read 1024 chars, eof is false
Mon Jul 11 2011 12:26:19 GMT-0400 Read 735 chars, eof is true
Mon Jul 11 2011 12:26:19 GMT-0400 Read 0 chars, eof is true
I suspect you're also better off using something like socketBin.read(64*1024) for a 64k buffer size, but it doesn't seem to effect the on-the-wire protocol, so perhaps its not so important.
If you don't want to reply on the server

Send a picture file using sockets

Hi,
Could someone please tell me how I can send a picture file using sockets across a TCP/IP network? I have managed to do it by converting the file into a byte array and then sending it but I dont see the data back at the client when I recieve the file. I just see the byte array as having size 0 at client.
Byte array size is correct at client side.
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i used OutputStream as
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I used migration assistant and my ethernet cable to move data and apps from my 5-yr old Intel-based iMac to my brand new Intel-based iMac running OS Lion. The old machine was running OS 10.5.8. Not all my files transferred (or I can't find them). Help

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Use Socket to send a File

I'm looking for the best method to send a Text file to a Mainframe box using sockets, I know that I can do this whit FTP, but I'm trying to get the best way to do it, if anybody can give me an idea I'll appreciate that,
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You'll need to elaborate on your requirements to get the best solution... Otherwise, you'll be hard pressed to find something better than FTP. It's a standardised protocol for file transfer. What more could you want?

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