i want to send large files,,,,,this program only send upto size:1024*1024 ,,,,plz help me out!!
client-

import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class ftpclient extends JFrame implements ActionListener
{
     JButton b1,b2;
    JTextField t1;
 ftpclient()
 {
  b1 =new JButton("Select File");
  b2 = new JButton("Send File to Server");
  t1 = new JTextField(15);
  setLayout(new FlowLayout());
  add(b1);
  add(t1);
  add(b2);
  b1.addActionListener(this);
  b2.addActionListener(this);
 }

 public void actionPerformed(ActionEvent ae)
 { 
     if(ae.getSource()==b1)
  {
   FileDialog fd;
   Frame f1=new Frame();
   fd=new FileDialog(f1,"Select File");
   fd.setSize(300,300); 
   fd.setVisible(true);
  t1.setText(fd.getDirectory()+fd.getFile());
   }

   if(ae.getSource()==b2)
  {
    String s=t1.getText();
  try
  {
FileInputStream f1 = new FileInputStream(s);
   byte b[]=new byte[1024*1024];

  DataInputStream dis1 = new DataInputStream(f1);


   Socket so = new Socket("127.0.0.1",20);
  OutputStream os=so.getOutputStream();


   dis1.read(b,0,b.length);
      os.write(b);
       os.flush();

        so.close();
        os.close();

      }
catch(Exception e) { e.printStackTrace(); }
 }    
}
public static void main(String s[])
 {
   new ftpclient().setVisible(true);
 }
}

server-

import java.io.*;
import java.net.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class ftpserver extends JFrame implements Runnable,ActionListener
{
  TextArea t1; Thread t;
  Button b1;
 ftpserver()
 {
   t1=new TextArea();
  add(t1);
 b1=new Button("Save File");
  b1.addActionListener(this);
 add(b1,BorderLayout.SOUTH);
t=new Thread(this);
t.start();
}

byte b[] = new byte[1024*1024];
public void run()
{

try {
  ServerSocket ss = new ServerSocket(20);
    while(true)
    {
        Socket s = ss.accept();
        System.out.println(s);
       InputStream is = s.getInputStream();

       is.read(b);


     }
    }catch(Exception e){e.printStackTrace(); }

    }
public void actionPerformed(ActionEvent ae)
 {
   Frame f1=new Frame();
   FileDialog fd = new FileDialog(f1,"Save",FileDialog.SAVE);
 fd.setSize(300,300);
 fd.setVisible(true);
try
 {
  FileOutputStream f=new FileOutputStream(fd.getDirectory()+fd.getFile());


  f.write(b);
 f.close();
 }catch(Exception e){ }
}
public static void main(String s[])
{
  new ftpserver().setVisible(true);
 }
}
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