Send a file through a socket connection
Submitted by thanushkag on Sat, 06/13/2009 - 03:38.
Hi All,
I need to read a file using a server socket and send the file to a client socket and assemble the file at the clients end. I tried to do it several ways, but failed.
Can someone tell me how to do it. Specially assemble the bits at the clients end and recreate the file and assign to a file object.
Thanks.
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Socket connection
Go to this link and good luck.
http://www.example-code.com/java/javasocket.asp
The Client just makes a
The Client just makes a connection to the port specified on the local machine and writes the received bytes to a file as specified.
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Good approach. Some tweaks
Good approach. Some tweaks are required against:
1. hardcoded byte array size
2. infinite while loop instead of timertask
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Just put together an
Just put together an extremely quick and dirty couple of example classes for you.
It only demonstrates a Server which waits for the first client connection, then just sends the contents of the specified file down the stream and closes up afterwards.
The Client just makes a connection to the port specified on the local machine and writes the received bytes to a file as specified.
It's not useful in itself, but it should show you all of the bits needed. Received over a ServerSocket is the same as the other way round, once you have the instance of Socket.
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import com.sun.xml.internal.messaging.saaj.util.ByteOutputStream;
public class Server {
private int port;
private String fileName;
public Server(int port, String fileName) {
this.port = port;
this.fileName = fileName;
}
private void listen() throws IOException {
BufferedInputStream in = null;
BufferedOutputStream out = null;
Socket client = null;
try {
ServerSocket socket = new ServerSocket(port);
client = socket.accept();
out = new BufferedOutputStream(client.getOutputStream());
File f = new File(fileName);
in = new BufferedInputStream(new FileInputStream(f));
byte[] b = new byte[256];
int read = -1;
while ((read = in.read(b)) >= 0) {
out.write(b, 0, read);
}
} finally {
try {
in.close();
} catch (Exception e) {}
try {
out.close();
} catch (Exception e) {}
try {
client.close();
} catch (Exception e) {}
}
}
public static void main(String[] args) throws IOException {
new Server(15000, "image.jpg").listen();
}
}
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.net.UnknownHostException;
public class Client {
private int port;
private String fileName;
public Client(int port, String fileName) {
this.port = port;
this.fileName = fileName;
}
private void connect() throws UnknownHostException, IOException {
BufferedInputStream in = null;
BufferedOutputStream out = null;
Socket socket = null;
try {
socket = new Socket("127.0.0.1", 15000);
in = new BufferedInputStream(socket
.getInputStream());
File f = new File(fileName);
out = new BufferedOutputStream(
new FileOutputStream(f));
byte[] b = new byte[256];
int read = -1;
while ((read = in.read(b)) >= 0) {
out.write(b, 0, read);
}
} finally {
try {
in.close();
} catch (Exception e) {
}
try {
out.close();
} catch (Exception e) {
}
try {
socket.close();
} catch (Exception e) {
}
}
}
public static void main(String[] args) throws UnknownHostException,
IOException {
new Client(15000, "receivedImage.jpg").connect();
}
}
Run Server first with a file named image.jpg in the working directory (or whatever you change the name to) then run Client.
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Nice post. Thanks OPC
Nice post.
Thanks
OPC
FileServer en client example
Here's what I cooked up for you. Obviously it's flawed in many ways, like selecting which file to send, where to save etc, but you'll get the point...
*** File FileServer.java ***
package fileserver;
import java.net.ServerSocket;
import java.net.Socket;
import java.io.*;
public class FileServer implements Runnable{
private final int PORT = 25573;
public static void main(String[] args) {
new Thread(new FileServer() ).start();
}
public void run() {
ServerSocket s = null;
try {
s = new ServerSocket(PORT);
}
catch (IOException e) {
e.printStackTrace();
}
while (s != null) {
try {
Socket client = s.accept();
System.out.println("client = " + client.getInetAddress());
new Thread( new FileServerClient(client) ).start();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
static class FileServerClient implements Runnable {
private Socket socket;
FileServerClient( Socket s) {
socket = s;
}
public void run() {
try {
BufferedOutputStream out = new BufferedOutputStream( socket.getOutputStream() );
FileInputStream fileIn = new FileInputStream( "/home/warner/yoursourcefile.ext");
byte[] buffer = new byte[8192];
int bytesRead =0;
while ((bytesRead = fileIn.read(buffer)) > 0) {
out.write(buffer, 0, bytesRead);
}
out.flush();
out.close();
fileIn.close();
}
catch (IOException e) {
e.printStackTrace();
}
finally {
try {
socket.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
*** File FileClient.java ***
package fileserver;
import java.net.Socket;
import java.net.InetSocketAddress;
import java.io.IOException;
import java.io.InputStream;
import java.io.FileOutputStream;
public class FileClient {
private String hostname;
private int port;
public static void main(String[] args) {
FileClient fc = new FileClient("localhost", 25573);
}
public FileClient(String hostname, int port) {
this.hostname = hostname;
this.port = port;
connect();
}
private void connect() {
Socket s = new Socket();
try {
s.connect( new InetSocketAddress(hostname, port) );
InputStream in = s.getInputStream();
FileOutputStream out = new FileOutputStream("/home/warner/your destinationfile.ext");
byte[] buffer = new byte[8192];
int bytesRead=0;
while ((bytesRead = in.read(buffer)) > 0) {
out.write(buffer, 0, bytesRead);
}
out.flush();
out.close();
}
catch (IOException e) {
e.printStackTrace();
}
finally {
try {
s.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
}
File server example
Here's what I cooked up for you. Flawed in many ways, like file selection, destination, error handling, but it works. Let me know how you get on with it...
*** FileServer.java ***
package fileserver;
import java.net.ServerSocket;
import java.net.Socket;
import java.io.*;
public class FileServer implements Runnable{
private final int PORT = 25573;
public static void main(String[] args) {
new Thread(new FileServer() ).start();
}
public void run() {
ServerSocket s = null;
try {
s = new ServerSocket(PORT);
}
catch (IOException e) {
e.printStackTrace();
}
while (s != null) {
try {
Socket client = s.accept();
System.out.println("client = " + client.getInetAddress());
new Thread( new FileServerClient(client) ).start();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
static class FileServerClient implements Runnable {
private Socket socket;
FileServerClient( Socket s) {
socket = s;
}
public void run() {
try {
BufferedOutputStream out = new BufferedOutputStream( socket.getOutputStream() );
FileInputStream fileIn = new FileInputStream( "/home/warner/yoursourcefile.ext");
byte[] buffer = new byte[8192];
int bytesRead =0;
while ((bytesRead = fileIn.read(buffer)) > 0) {
out.write(buffer, 0, bytesRead);
}
out.flush();
out.close();
fileIn.close();
}
catch (IOException e) {
e.printStackTrace();
}
finally {
try {
socket.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
*** FileClient.java ***
package fileserver;
import java.net.Socket;
import java.net.InetSocketAddress;
import java.io.IOException;
import java.io.InputStream;
import java.io.FileOutputStream;
public class FileClient {
private String hostname;
private int port;
public static void main(String[] args) {
FileClient fc = new FileClient("localhost", 25573);
}
public FileClient(String hostname, int port) {
this.hostname = hostname;
this.port = port;
connect();
}
private void connect() {
Socket s = new Socket();
try {
s.connect( new InetSocketAddress(hostname, port) );
InputStream in = s.getInputStream();
FileOutputStream out = new FileOutputStream("/home/warner/mydestinationfile.ext");
byte[] buffer = new byte[8192];
int bytesRead=0;
while ((bytesRead = in.read(buffer)) > 0) {
out.write(buffer, 0, bytesRead);
}
out.flush();
out.close();
}
catch (IOException e) {
e.printStackTrace();
}
finally {
try {
s.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
}
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Thanks
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Ever tried using java.nio
Ever tried using java.nio SocketChannels? less coding and seem easier to use,
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