Copy Files Between Two Unix Computers

Question

Hi,
I am trying to write a piece of code that will copy bunch of files from one Unix computer on to another Unix computer. On windows it seems to be pretty straight but on Unix I am trying to understand best way of copying the files. I don't have much expertise in Unix.
Is using FTP the only option for Unix?
I am not able to create a FILE object by referring to a file on some other Unix box? I tried new File("//unixbox2/temp/123.txt");
Please let me know the different ways to copy files between Unix computers.
Thanks
Gautham

Answer 1

This's a simple example of how you can send a file form one computer to another
import java.io.*;
import java.net.*;
public class Prf extends Thread {
     public void run() { //Read form file and writer to socket
          try {
               Thread.sleep(100);//sleep(100) while server is getting ready to accept connection
               System.out.println("Connecting...");
               Socket soc = new Socket("localhost",4070);
               OutputStream outS = soc.getOutputStream();
               FileInputStream fis = new FileInputStream("input.dat");
               int i = 0;
               byte[] b = new byte[1000000]; //1MB buffer
               for(;;) {
                    i = fis.read(b); //read from file (i - number of read bytes)
                    if (i != -1) {// checking for end of data
                         outS.write(b,0,i); //write portion (0..i) of bytes to socket
                    } else {
                         break;
               fis.close();
               outS.close();
               soc.close();
          } catch (IOException e) {
               System.out.println(e.getMessage());
          } catch (InterruptedException e) {
               System.out.println(e.getMessage());
     public static void main(String[] args) {//Read from socket and write to file
          Prf prf = new Prf();
          try {
               ServerSocket sSoc = new ServerSocket(4070);
               prf.start(); //start writer
               Socket soc = sSoc.accept();
               System.out.println("Connection's accepted");
               InputStream inS = soc.getInputStream();
               FileOutputStream fos = new FileOutputStream("output.dat");
               int i = 0;
               byte [] b = new byte[1000000]; //buffer
               while (true) {
                    i = inS.read(b);//read from socket (i - number of read bytes)
                    if (i != -1) { //check for end of date
                         fos.write(b,0,i); //write portion (0..i) of bytes to file
                    } else {
                         break;
               fos.close();
               inS.close();
               soc.close();
               sSoc.close();
          } catch (IOException e) {
               System.out.println(e.getMessage());
}