simple FTP server and FTP client

hi to all expert from java-forum. i`m a new user,and currently a student here.

well..i need help. i hv problem wiht my ftp transfer. i found my file crash after it deliver to server side. can anyone help me.

can anyone help me to solve this problmes?? thx

Quote:

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i found my file crash after it deliver to server side.

---

?

Please provide some details.

Post some code and errors and exceptions if any.

//server

//FtpServer.java
import java.io.*;
import java.net.*;

public class FtpServer
{
public static void main(String [] args)
{
int i=1;

System.out.println("****************************** ************************************************** ");
System.out.println("****************************** FTP SERVER***********************************");

System.out.println("****************************** ************************************************** ");
System.out.println("Server Started...");
System.out.println("Waiting for connections...");
System.out.println(" ");
try
{

ServerSocket s = new ServerSocket(100);
for(;;)
{
Socket incoming = s.accept();
System.out.println("New Client Connected with id " + i +" from "+incoming.getInetAddress().getHostName()+"... " );
Thread t = new ThreadedServer(incoming,i);
i++;
t.start();
}
}
catch(Exception e)
{
System.out.println("Error: " + e);
}
}
}

class ThreadedServer extends Thread
{
int n;
String c,fn,fc;
String filenm;
Socket incoming;
int counter;
String dirn="c:/FTP SERVER DIRECTORY";
public ThreadedServer(Socket i,int c)
{
incoming=i;
counter=c;
}

public void run()
{
try
{

BufferedReader in =new BufferedReader(new
InputStreamReader(incoming.getInputStream()));
PrintWriter out = new
PrintWriter(incoming.getOutputStream(), true);
OutputStream output=incoming.getOutputStream();
fn=in.readLine();
c=fn.substring(0,1);

if(c.equals("#"))
{
n=fn.lastIndexOf("#");
filenm=fn.substring(1,n);
FileInputStream fis=null;
boolean filexists=true;
System.out.println("Request to download file "+filenm+" recieved from "+incoming.getInetAddress().getHostName()+"... ");
try
{
fis=new FileInputStream(filenm);
}
catch(FileNotFoundException exc)
{
filexists=false;
System.out.println("FileNotFoundException: "+exc.getMessage());
}
if(filexists)
{
sendBytes(fis, output) ;
fis.close();
}
}
else
{
try
{
boolean done=true;
System.out.println("Request to upload file " +fn+" recieved from "+incoming.getInetAddress().getHostName()+"... ");

File dir=new File(dirn);
if(!dir.exists())
{
dir.mkdir();
}
else
{}
File f=new File(dir,fn);
FileOutputStream fos=new FileOutputStream(f);
DataOutputStream dops=new DataOutputStream(fos);

while(done)
{
fc=in.readLine();
if(fc==null)
{
done=false;
}
else
{
dops.writeChars(fc);
// System.out.println(fc);

}
}
fos.close();
}
catch(Exception ecc)
{
System.out.println(ecc.getMessage());
}
}
incoming.close();
}
catch(Exception e)
{
System.out.println("Error: " + e);
}
}
private static void sendBytes(FileInputStream f,OutputStream op)
throws Exception
{
byte[] buffer=new byte[1024];
int bytes=0;

while((bytes=f.read(buffer))!=-1)
{
op.write(buffer,0,bytes);
}
}
}




//client

//FtpClient.java

import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.lang.*;
class FtpClient extends JFrame implements ActionListener
{
String fn,filenm;
String fc;
String dirn="";
String dirn1="";
//String dirn="c:/FTP CLIENT DIRECTORY";
JPanel pnl;
JLabel lbltle,lblud;
Font fnt;
JTextField txtfn;
JButton btnu,btnd,btnselect;
Socket s;
InputStreamReader in;
OutputStream out;
BufferedReader br;
PrintWriter pw;

JTextField _fileNameTF = new JTextField(15);
JTextField _wordCountTF = new JTextField(4);
JFileChooser _fileChooser = new JFileChooser();


public FtpClient()
{
super("FTP CLIENT");

pnl=new JPanel(null);

fnt=new Font("Times New Roman",Font.BOLD,25);

lbltle=new JLabel("FTP CLIENT");
lbltle.setFont(fnt);
lbltle.setBounds(225,35,200,30);
pnl.add(lbltle);

lblud=new JLabel("ENTER FILE-NAME :");
lblud.setBounds(100,100,150,35);
pnl.add(lblud);

txtfn=new JTextField();
txtfn.setBounds(300,100,200,25);
pnl.add(txtfn);

btnu=new JButton("UPLOAD");
btnu.setBounds(150,200,120,35);
pnl.add(btnu);


btnd=new JButton("DOWNLOAD");
btnd.setBounds(320,200,120,35);
pnl.add(btnd);

btnselect = new JButton("Select");
btnselect.setBounds(150,150,170,35);
pnl.add(btnselect);


btnu.addActionListener(this);
btnd.addActionListener(this);
btnselect.addActionListener(this);
getContentPane().add(pnl);

try
{
s=new Socket("localhost",100);
br=new BufferedReader(new InputStreamReader(s.getInputStream()));
pw=new PrintWriter(s.getOutputStream(),true);
out=s.getOutputStream();
}
catch(Exception e)
{
System.out.println("ExCEPTION :"+e.getMessage());
}
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==btnselect)
{

System.out.println("haha");

JFileChooser chooser = new JFileChooser();
chooser.showOpenDialog(this);
File file = chooser.getSelectedFile();
System.out.println(file);


dirn1= file.getName();
System.out.println("first" + dirn1);

dirn = file.getAbsolutePath(); ///get file path
System.out.println("second" + dirn);

txtfn.setText(dirn1);

// _fileNameTF = file;
// int retval = _fileChooser.showOpenDialog(CountWords.this);
// if (retval == JFileChooser.APPROVE_OPTION) {
//... The user selected a file, get it, use it.
//File file = _fileChooser.getSelectedFile();
//System.out.println(file);

//... Update user interface.
// _fileNameTF.setText(file.getName());
// _wordCountTF.setText("" + countWordsInFile(file));
// }

}





if(e.getSource()==btnu)
{
try
{
filenm=txtfn.getText();

System.out.println(filenm);
//filenm="testing.txt";
pw.println(filenm);
FileInputStream fis=new FileInputStream(filenm);


byte[] buffer=new byte[1024];
int bytes=0;

while((bytes=fis.read(buffer))!=-1)
{
out.write(buffer,0,bytes);
}
fis.close();

}
catch(Exception exx)
{
System.out.println(exx.getMessage());
}
}

if(e.getSource()==btnd)
{
try
{
File dir=new File(dirn); //directory---need to upgrade it
if(!dir.exists())
{
dir.mkdir();
}
else{}
boolean done=true;
filenm=txtfn.getText(); /// the name of the file---upgrade into imageview



fn=new String("#"+filenm+"#");

//System.out.println(filenm);
pw.println(fn);

File f=new File(dir,filenm);
FileOutputStream fos=new FileOutputStream(f);
DataOutputStream dops=new DataOutputStream(fos);
while(done)
{
fc=br.readLine();
if(fc==null)
{
done=false;
}
else
{
dops.writeChars(fc);
// System.out.println(fc);

}
}
fos.close();
}

catch(Exception exx)
{}

}
}
public static void main(String args[])
{
FtpClient ftpc=new FtpClient();
ftpc.setSize(600,300);
ftpc.show();
}
}





after i send the file from client to server, i found that the file was crash,and it couldnt be open.