Dear Sir ,
I am from Virtual University , Pakistan , studying at home . I am stuck with file transfer problem . In text book code , they have used " localhost" as the server . I am trying to send a text file from my computer IP 192.168.1.33 to another computer next door ( on the same LAN ) IP 192.168.1.34 . Same is not getting through , presumably the coding problem. However , simple string like "Hello Abdul ... ..." , does pass on and is echoed back.

Please tell me how I can over came the problem ? Please send the code (snippet only) to send a text file like " stars.txt " , then recieving the confirmation of transfer. Same may be displayed on message box , or any other form.

Please help me as I am badly stuck , despite of trying several different codes. Thanking you with sincere wishes,

Abdul hayee ,
ahayee84@hotmail.com
ahayee84@yahoo.com

Rather show us your code so we can point out whats wrong instead.

: Rather show us your code so we can point out whats wrong instead.
....................
Dear Sir ,
The code is as under :
Regards,
ah.



/* "File transfer via sockets". */

/* i make a client - server file transfer but when server receive file i want serve send a msg to client that take the file. I try different but nothing.

my code is:

*/

/* ******** Client ******** */

import java.net.*;
import java.io.*;

class Client{
public static void main (String[] args){

DataInputStream input;

BufferedInputStream bis;
BufferedOutputStream bos;
int in;
byte[] byteArray;

try {

Socket client = new Socket("192.168.0.33", 2222);

input = new DataInputStream (client.getInputStream() );

output.writeUTF( "send a file" );
System.out.println("Server message: " +input.readUTF() );

bis = new BufferedInputStream(new FileInputStream("encryptAtmMsg.txt"));
bos = new BufferedOutputStream(client.getOutputStream());
byteArray = new byte[9999]; // Looks enough for a small file
while ((in = bis.read(byteArray)) != -1){
bos.write(byteArray,0,in);
}
bis.close();
bos.close();

System.out.println("Server message: " +input.readUTF() );
}
catch ( Exception e ) {
System.err.println(e);
}
}
}

/* ******* Server ********* */

import java.net.*;
import java.io.*;

class Server{
public static void main (String[] args){

ServerSocket server;
Socket connection;

DataOutputStream output;

BufferedInputStream bis;
BufferedOutputStream bos;

byte[] receivedData;
int in;
try {
server = new ServerSocket( 2222 );

while ( true ) {
connection = server.accept();

output = new DataOutputStream (connection.getOutputStream() );

System.out.println( "Client message: " +input.readUTF() );
output.writeUTF( " ack 1" );

receivedData = new byte[9999];
bis = new BufferedInputStream(connection.getInputStream());
bos = new BufferedOutputStream(new FileOutputStream("stars.txt"));
while ((in = bis.read(receivedData)) != -1){
bos.write(receivedData,0,in);
}
bos.close();

output.writeUTF( " ack 2" );
}
}
catch (IOException e ) { }
}
}

/* ********** File : stars.txt ************ */

Good friends are like stars........
You don't always see them,
but you know they are always there



/* The error shown is:
java.net.SocketException: socket closed


*/

If you are using Windows XP, Vista , disable firewall on both computers . and show us your code first.

: If you are using Windows XP, Vista , disable firewall on both
: computers . and show us your code first.
:
:
........................................................................
Dear Sir ,
I am using windows XP . with built in firewall . There is no additional firewall . My codes are as under :





/* "File transfer via sockets". */

/* i make a client - server file transfer but when server receive file i want serve

send a msg to client that take the file. I try different but nothing.

my code is:

*/

/* ******** Client ******** */

import java.net.*;
import java.io.*;

class Client{
public static void main (String[] args){

DataInputStream input;

BufferedInputStream bis;
BufferedOutputStream bos;
int in;
byte[] byteArray;

try {

Socket client = new Socket("192.168.0.33", 2222);

input = new DataInputStream (client.getInputStream() );

output.writeUTF( "send a file" );
System.out.println("Server message: " +input.readUTF() );

bis = new BufferedInputStream(new FileInputStream("encryptAtmMsg.txt"));
bos = new BufferedOutputStream(client.getOutputStream());
byteArray = new byte[9999]; // Looks enough for a small file
while ((in = bis.read(byteArray)) != -1){
bos.write(byteArray,0,in);
}
bis.close();
bos.close();

System.out.println("Server message: " +input.readUTF() );
}
catch ( Exception e ) {
System.err.println(e);
}
}
}

/* ******* Server ********* */

import java.net.*;
import java.io.*;

class Server{
public static void main (String[] args){

ServerSocket server;
Socket connection;

DataOutputStream output;

BufferedInputStream bis;
BufferedOutputStream bos;

byte[] receivedData;
int in;
try {
server = new ServerSocket( 2222 );

while ( true ) {
connection = server.accept();

output = new DataOutputStream (connection.getOutputStream() );

System.out.println( "Client message: " +input.readUTF() );
output.writeUTF( " ack 1" );

receivedData = new byte[9999];
bis = new BufferedInputStream(connection.getInputStream());
bos = new BufferedOutputStream(new FileOutputStream("stars.txt"));
while ((in = bis.read(receivedData)) != -1){
bos.write(receivedData,0,in);
}
bos.close();

output.writeUTF( " ack 2" );
}
}
catch (IOException e ) { }
}
}

/* ********** File : stars.txt ************ */

Good friends are like stars........
You don't always see them,
but you know they are always there



/* The error shown is:
java.net.SocketException: socket closed


*/

Refer the book, Java Network Programming by Elloit rusty Harold, Orielly publication.

Examples from this books can be found at http://www.cafeaulait.org/books/jnp/javanetexamples/

I am pasting a good example from this book which have good server implementation
----------------------------------------

import java.net.*;
import java.io.*;

public class clientTester {

public static void main(String[] args) {

int thePort;
ServerSocket ss;
Socket theConnection;

try {
thePort = Integer.parseInt(args[0]);
}
catch (Exception e) {
thePort = 0;
}

try {
ss = new ServerSocket(thePort);
System.out.println("Listening for connections on port " + ss.getLocalPort());

while (true) {
theConnection = ss.accept();
System.out.println("Connection established with " + theConnection);
InputThread it = new InputThread(theConnection.getInputStream());
it.start();
OutputThread ot = new OutputThread(theConnection.getOutputStream(), it);
ot.start();
// need to wait for ot and it to finish
try {
ot.join();
it.join();
}
catch (InterruptedException e) {
}
}
}
catch (IOException e) {

}

}

}

class InputThread extends Thread {

InputStream is;

public InputThread(InputStream is) {
this.is = is;
}

public void run() {

try {
while (true) {
int i = is.read();
if (i == -1) break;
char c = (char) i;
System.out.print(c);
}
}
catch (IOException e) {
System.err.println(e);
}

}

}

class OutputThread extends Thread {

PrintStream ps;
DataInputStream is;
InputThread it;

public OutputThread(OutputStream os, InputThread it) {
ps = new PrintStream(os);
this.it = it;
is = new DataInputStream(System.in);
}

public void run() {

String line;
try {
while (true) {
line = is.readLine();
if (line.equals(".")) break;
ps.println(line);
}
}
catch (IOException e) {

}
it.stop();
}

}