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Program of FTP client and server

Posted By: Easy Tutor     Category: Java     Views: 78657

Write a program of FTP client and server.

Code for Program of FTP client and server in Java

// FTP Client

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


class FTPClient
{
    publicstaticvoid main(String args[]) throws Exception
    {
        Socket soc=new Socket("127.0.0.1",5217);
        transferfileClient t=new transferfileClient(soc);
        t.displayMenu();
        
    }
}
class transferfileClient
{
    Socket ClientSoc;

    DataInputStream din;
    DataOutputStream dout;
    BufferedReader br;
    transferfileClient(Socket soc)
    {
        try
        {
            ClientSoc=soc;
            din=new DataInputStream(ClientSoc.getInputStream());
            dout=new DataOutputStream(ClientSoc.getOutputStream());
            br=new BufferedReader(new InputStreamReader(System.in));
        }
        catch(Exception ex)
        {
        }        
    }
    void SendFile() throws Exception
    {        
        
        String filename;
        System.out.print("Enter File Name :");
        filename=br.readLine();
            
        File f=new File(filename);
        if(!f.exists())
        {
            System.out.println("File not Exists...");
            dout.writeUTF("File not found");
            return;
        }
        
        dout.writeUTF(filename);
        
        String msgFromServer=din.readUTF();
        if(msgFromServer.compareTo("File Already Exists")==0)
        {
            String Option;
            System.out.println("File Already Exists. Want to OverWrite (Y/N) ?");
            Option=br.readLine();            
            if(Option=="Y")    
            {
                dout.writeUTF("Y");
            }
            else
            {
                dout.writeUTF("N");
                return;
            }
        }
        
        System.out.println("Sending File ...");
        FileInputStream fin=new FileInputStream(f);
        int ch;
        do
        {
            ch=fin.read();
            dout.writeUTF(String.valueOf(ch));
        }
        while(ch!=-1);
        fin.close();
        System.out.println(din.readUTF());
        
    }
    
    void ReceiveFile() throws Exception
    {
        String fileName;
        System.out.print("Enter File Name :");
        fileName=br.readLine();
        dout.writeUTF(fileName);
        String msgFromServer=din.readUTF();
        
        if(msgFromServer.compareTo("File Not Found")==0)
        {
            System.out.println("File not found on Server ...");
            return;
        }
        elseif(msgFromServer.compareTo("READY")==0)
        {
            System.out.println("Receiving File ...");
            File f=new File(fileName);
            if(f.exists())
            {
                String Option;
                System.out.println("File Already Exists. Want to OverWrite (Y/N) ?");
                Option=br.readLine();            
                if(Option=="N")    
                {
                    dout.flush();
                    return;    
                }                
            }
            FileOutputStream fout=new FileOutputStream(f);
            int ch;
            String temp;
            do
            {
                temp=din.readUTF();
                ch=Integer.parseInt(temp);
                if(ch!=-1)
                {
                    fout.write(ch);                    
                }
            }while(ch!=-1);
            fout.close();
            System.out.println(din.readUTF());
                
        }
        
        
    }

    publicvoid displayMenu() throws Exception
    {
        while(true)
        {    
            System.out.println("[ MENU ]");
            System.out.println("1. Send File");
            System.out.println("2. Receive File");
            System.out.println("3. Exit");
            System.out.print("\nEnter Choice :");
            int choice;
            choice=Integer.parseInt(br.readLine());
            if(choice==1)
            {
                dout.writeUTF("SEND");
                SendFile();
            }
            elseif(choice==2)
            {
                dout.writeUTF("GET");
                ReceiveFile();
            }
            else
            {
                dout.writeUTF("DISCONNECT");
                System.exit(1);
            }
        }
    }
}

// FTP Server

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

publicclass FTPServer
{
    publicstaticvoid main(String args[]) throws Exception
    {
        ServerSocket soc=new ServerSocket(5217);
        System.out.println("FTP Server Started on Port Number 5217");
        while(true)
        {
            System.out.println("Waiting for Connection ...");
            transferfile t=new transferfile(soc.accept());
            
        }
    }
}

class transferfile extends Thread
{
    Socket ClientSoc;

    DataInputStream din;
    DataOutputStream dout;
    
    transferfile(Socket soc)
    {
        try
        {
            ClientSoc=soc;                        
            din=new DataInputStream(ClientSoc.getInputStream());
            dout=new DataOutputStream(ClientSoc.getOutputStream());
            System.out.println("FTP Client Connected ...");
            start();
            
        }
        catch(Exception ex)
        {
        }        
    }
    void SendFile() throws Exception
    {        
        String filename=din.readUTF();
        File f=new File(filename);
        if(!f.exists())
        {
            dout.writeUTF("File Not Found");
            return;
        }
        else
        {
            dout.writeUTF("READY");
            FileInputStream fin=new FileInputStream(f);
            int ch;
            do
            {
                ch=fin.read();
                dout.writeUTF(String.valueOf(ch));
            }
            while(ch!=-1);    
            fin.close();    
            dout.writeUTF("File Receive Successfully");                            
        }
    }
    
    void ReceiveFile() throws Exception
    {
        String filename=din.readUTF();
        if(filename.compareTo("File not found")==0)
        {
            return;
        }
        File f=new File(filename);
        String option;
        
        if(f.exists())
        {
            dout.writeUTF("File Already Exists");
            option=din.readUTF();
        }
        else
        {
            dout.writeUTF("SendFile");
            option="Y";
        }
            
            if(option.compareTo("Y")==0)
            {
                FileOutputStream fout=new FileOutputStream(f);
                int ch;
                String temp;
                do
                {
                    temp=din.readUTF();
                    ch=Integer.parseInt(temp);
                    if(ch!=-1)
                    {
                        fout.write(ch);                    
                    }
                }while(ch!=-1);
                fout.close();
                dout.writeUTF("File Send Successfully");
            }
            else
            {
                return;
            }
            
    }


    publicvoid run()
    {
        while(true)
        {
            try
            {
            System.out.println("Waiting for Command ...");
            String Command=din.readUTF();
            if(Command.compareTo("GET")==0)
            {
                System.out.println("\tGET Command Received ...");
                SendFile();
                continue;
            }
            elseif(Command.compareTo("SEND")==0)
            {
                System.out.println("\tSEND Command Receiced ...");                
                ReceiveFile();
                continue;
            }
            elseif(Command.compareTo("DISCONNECT")==0)
            {
                System.out.println("\tDisconnect Command Received ...");
                System.exit(1);
            }
            }
            catch(Exception ex)
            {
            }
        }
    }
}
  
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Easy Tutor
Easy Tutor author of Program of FTP client and server is from United States. Easy Tutor says

Hello Friends,

I am Free Lance Tutor, who helped student in completing their homework.

I have 4 Years of hands on experience on helping student in completing their homework. I also guide them in doing their final year projects.

I have share many programs on this website for everyone to use freely, if you need further assistance, than please contact me on easytutor.2ya [at the rate] gmail [dot] com

I have special discount scheme for providing tutor services. I am providing tutor service to students from various contries, currently most of my students are from United States, India, Australia, Pakistan, Germany, UK and Canada.

I am also here to expand my technical network to receive more opportunity in my career, make friends to help them in resolving their technical problem, learn and share my knowledge, If you like to be my friend, Please send me friend request.

Thanks,
Happy Programming :)

 
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Soryun Duong from United States Comment on: Jan 21
I has problem with client after add new client.
1-client1 after get file and disconnect it's ok
2- client2 request to get file from server it error can you show me how to fix this

Noma Villanueva from Mexico Comment on: Dec 20
how I can delete a file since client, and show files

Noma Villanueva from Mexico Comment on: Dec 20
how I can delete a file since server, and show

View All Comments