Problem with printing to files....................

Question

Well....i need to write a progr tat transfers filename from client to server asnd then the server coies that file(in a directory)....but im not able to do it...im unable to write to files...i dont know y?....
import java.io.*;
import java.net.*;
public class fserver
     public static void main(String args[]) throws Exception
          ServerSocket ss=new ServerSocket(9090);
          Socket s=ss.accept();
          while(true)
               DataInputStream dis=new DataInputStream(s.getInputStream());
               PrintStream ps=new PrintStream(s.getOutputStream());
               String s1=dis.readLine();
               DataInputStream dis1=new DataInputStream(new FileInputStream(s1));
String savepath="";
savepath=s1.substring(1+s1.lastIndexOf('\\'));
System.out.println("Saving file as:"+savepath);
FileWriter fw=new FileWriter(savepath);
               String st;
fw.write("dfjsdklfdlk");//well the file should atleast contain this.......but it is not receiving even this....but the next //system.out.pritln is working perfectly(in the while loop)
               /*while((st=dis1.readLine())!=null)
                    System.out.println(st);fw.write(st);
ps.println("File OK");
               System.out.println("Received the requested file");System.exit(1);
}

Answer 1

Hi,
I would recommend to start reading this http://java.sun.com/docs/books/tutorial/networking/sockets/index.html
Or
There is more efficient way by using FileChannel ex;
public class FileServer {
     static int counter = 1;
     public static void main(String args[]) throws IOException {
          ServerSocketChannel serverSocket = null;
          try{
                serverSocket = ServerSocketChannel.open();
               serverSocket.socket().bind(new InetSocketAddress(444));
               String fName = "c:\\tmp\\abc"+"_"+counter + " .txt";
               FileOutputStream fos = new FileOutputStream(fName);
               FileChannel incoming =fos.getChannel();
               long count = incoming.size();
               while(true){
                    SocketChannel sock = serverSocket.accept();
                    incoming.transferFrom(sock, 0, 1024);
                    counter++;
          }catch(Exception e){
               e.printStackTrace();
          }finally {
               serverSocket.close();
* This is any client tries to send a file into the server
* @author alan
public class FileClient {
     public static void main(String args[]) throws IOException{
          FileChannel fChannel = null;
          FileInputStream inFile = null;
          try {
               SocketChannel clientSocket = SocketChannel.open(new InetSocketAddress("localhost", 444));
                inFile = new FileInputStream("c:\\tmp\\file1.txt");
                fChannel = inFile.getChannel();
                long count = inFile.getChannel().size();
                System.out.println(count);
                fChannel.transferTo(0,count, clientSocket);
          } catch (NumberFormatException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          } catch (IOException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          }finally {
            fChannel.close(); // always
            inFile.close(); // always
}Regards,
Alan Mehio
London,UK