FTP(File transfer)

[kimi lynn]

Hello everyone,
I would like to transfer files from client to server with out using sun ftp package.As of now, the file content is being read and sent to the server but the file is being copied on to "sentfile.txt". So whatever file i send from the client, its been written on the sentfile.txt.(Thats how I've written in the following code but have no clue how to get the actual file which I've sent from the client.Any help would be appreciable.
I think, I've to read the file at the client using a file i/p stream and then write bytes to socket o/p stream.At the server, I've to read the bytes using the socket i/p stream and then write those bytes to file o/p stream.

Thanking you in advance
Client Code:

import java.net.*;
import java.io.*;
public class tcpClient {
     public static void main(String[] args) {

          int port = 1234;
          String server = "IP-address";//ip-address of the server
          Socket socket = null;
          int ERROR = 1;
          //connect to server
          try {
               socket = new Socket(server, port);
               System.out.println("Connected with server "+socket.getInetAddress()+":"+socket.getPort());
          }
          catch (UnknownHostException e) {
               System.out.println(e);
               System.exit(ERROR);
          }
          catch (IOException e) {
               System.out.println(e);
               System.exit(ERROR);
          }
          try {
               byte[] buf = new byte[1024];
               OutputStream os = socket.getOutputStream();
               BufferedOutputStream out = new BufferedOutputStream(os,1024);
       String file = uploadfile; // I'm using a file chooser program to select a file.
               FileInputStream in = new FileInputStream(file);
               int i; 
               int bytecount=1024;
               while ((i = in.read(buf,0,1024)) != -1) {
                    bytecount=bytecount+1024; 
                    out.write(buf,0,1024);
                    out.flush();
               } 
               in.close();
               out.close();
               System.out.println("Bytes Sent :"+bytecount);
          }
          catch (IOException e) {
               System.out.println(e);
          }
          try {
               socket.close();
          }
          catch (IOException e) {
               System.out.println(e);
          }
     } 
}

Server Program

  
import java.net.*;
import java.io.*;
public class tcpServer {
     public static void main(String args[]) {
          int port;
          ServerSocket server_socket;
          try { 
               port = Integer.parseInt(args[0]);
          }
          catch (Exception e) {
               System.out.println("port = 1234 (default)");
               port = 1234;
          }
          try {
               server_socket = new ServerSocket(port);
               System.out.println("Server waiting for client on port " + server_socket.getLocalPort());
               // server infinite loop
               while(true) {
                    Socket socket = server_socket.accept();
                    System.out.println("New connection accepted "+socket.getInetAddress()+":"+socket.getPort());
                    try { 
                         byte[] b = new byte[1024];
                         int len=0;
                         int bytcount=1024;
                         String FileName="sentfile.txt"; //writing to a file named sentfile.txt
                         FileOutputStream inFile = new FileOutputStream(FileName);
                         InputStream is = socket.getInputStream();
                         BufferedInputStream in2 = new BufferedInputStream(is,1024);
                         while( (len = in2.read(b,0,1024)) != -1 ) {
                              bytcount=bytcount+1024;
                              inFile.write(b,0,1024);
                         }
                         in2.close();
                         inFile.close(); 
                         System.out.println("Bytes Writen : "+bytcount);
                    }
                    catch(IOException e) {
                         System.out.println("Unable to open file" + e);
                         return;
                    }
                    try {
                         socket.close();
                         System.out.println("Connection closed by client");
                    }
                    catch (IOException e) {
                         System.out.println(e);
                    }
               }
          }
          catch (IOException e) {
               System.out.println(e);
          }
     }
}

[ February 16, 2004: Message edited by: kimi lynn ]

[kimi lynn]

I wonder where am sending the file name to the server,huh!

[kimi lynn]

Could somebody pls post the code of Jeff Holmes Contribution regarding ftp using sockets.I found the URLdead.
Thanks in advance

[Joe Ess]

From the context it looks like he was talking about FTP as in File Transfer Protocol. I don't think you are looking for a full-blown FTP client, you just want to upload a file name then a file. Of course, this would require creating your own protocol. Take a look at the Custom Networking part of the Java Tutorial, specifically the Client/Server Pair example.