ftpserver.java

FTPserver and Client

package networkftpdsgn;

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

/**
 * <p>Title: FTPDisign</p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: jnucs</p>
 * @author chxb
 * @version 1.0
 */

public class FTPServer {
    public static void main(String[] args) throws IOException {
        System.out.println("Server is running");

        ServerSocket serverSocket = null;
        try {
            serverSocket =new ServerSocket(3000);
        } catch (IOException e) {
            System.err.println("Could not listen on port: 3000.");
            System.exit(1);
        }

        Socket clientSocket = null;
        try {
            clientSocket = serverSocket.accept();
        } catch (IOException e) {
            System.err.println("Accept failed.");
            System.exit(1);
        }
        PrintWriter oStream = new
        PrintWriter(clientSocket.getOutputStream(), true);
        BufferedReader iStream = new BufferedReader(
                                new InputStreamReader(
                                clientSocket.getInputStream()));
        oStream.println("connect to server");
        String clientCommand="";
        clientCommand=iStream.readLine() ;
        System.out.println("Client:"+clientCommand);
        if(clientCommand.substring(0,4).compareToIgnoreCase("get:") == 0){
          String filename = clientCommand.substring(5,clientCommand.length());
          try{
            FileInputStream fileStream = new FileInputStream(filename);
            if(fileStream!=null){

            }
          }
          catch( FileNotFoundException e){
            oStream.println("The file doesn't exist!") ;
            System.exit(1) ;
          }
        }
        else if(clientCommand.substring(0,4).compareToIgnoreCase("dir") == 0){

        }
        String line;
        BufferedReader sin= new BufferedReader( new
               InputStreamReader(System.in));
        line=sin.readLine();
        while (!line.equals("bye")) {
             oStream.println(line);
             oStream.flush();
             System.out.println("Server:"+line);
             System.out.println("Client:"+
                                iStream.readLine());
             line=sin.readLine();
        }
        iStream.close();
        oStream.close();
        sin.close();
        clientSocket.close();
        serverSocket.close();
    }
}