code gets hang

[rungtashubham]

hey m developing a program which is based on swing. i want to open a new form when i select a radio button. i have done coding for this. but when new form opens my code gets hang. i don't know what to do for this...
plz help me as soon as possible.
i need to submit it at my college..

m posting u my code here.
problem is with File Transfer Radio button...

package FileTransferServer;

import java.net.*;
import java.awt.Desktop;
import java.io.*;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
 
public class FTPServer {
 
     public FTPServer() {

 		  DataInputStream din;
		  DataOutputStream dout;
		  BufferedReader br;
          int port;
          ServerSocket server_socket;
 		  String fileName;
         
          port = 6666;
 
          try {
 
               server_socket = new ServerSocket(port);
               FileInformationForm.txtInforamtion.append("\nServer waiting for client on port " + server_socket.getLocalPort());
 
               // server infinite loop
               while(true) {
                    Socket socket = server_socket.accept();
                    FileInformationForm.txtInforamtion.append("\nNew connection accepted "+socket.getInetAddress()+":"+socket.getPort());
 					din=new DataInputStream(socket.getInputStream());
					dout=new DataOutputStream(socket.getOutputStream());
					br=new BufferedReader(new InputStreamReader(System.in));
                    try { 
                         byte[] b = new byte[1024];
                         int len=0;
                         int bytcount=1024;
                         String FileName="ftptest.pdf"; 
                        
                         InputStream is = socket.getInputStream();
                         BufferedInputStream in2 = new BufferedInputStream(is,1024);
                         fileName=din.readUTF();
                         FileInformationForm.txtInforamtion.append("\nFile Name : "+fileName);
                         FileInformationForm.txtInforamtion.append("\nComputer Name  : "+din.readUTF());
                         FileInformationForm.txtInforamtion.append("\nTime  : "+din.readUTF());
                         FileOutputStream inFile ;
                         File file = new File(fileName);
                         int option = JOptionPane.showConfirmDialog(FTPServerMain.desk,"File Received Save Disk?");
                         if(option == JOptionPane.YES_OPTION){
                         	JFileChooser chooser = new JFileChooser();
							chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
							chooser.showOpenDialog(FTPServerMain.desk);
                         	inFile = new FileOutputStream(chooser.getSelectedFile()+"\\"+fileName);
                         	while( (len = in2.read(b,0,1024)) != -1 ) {
                        		 bytcount=bytcount+1024;
                        	 	inFile.write(b,0,1024);
                         	}
                         	in2.close();
                         	inFile.close(); 
                         	FileInformationForm.txtInforamtion.append("\nBytes Writen : "+bytcount);
                         	FileInformationForm.txtInforamtion.append("\nFile Transferred Successfully");
                         }
                         else {
                         	inFile = new FileOutputStream("tmp"+"\\"+fileName);
                         	while( (len = in2.read(b,0,1024)) != -1 ) {
                        		 bytcount=bytcount+1024;
                        	 	inFile.write(b,0,1024);
                         	}
                         	in2.close();
                         	inFile.close(); 
                         /*	FileInformationForm.txtInforamtion.append("\nBytes Writen : "+bytcount);
                         	File fileInput = new File(fileName);
                         	Desktop dsk = Desktop.getDesktop();
                        	dsk.open(fileInput);*/
                         }
                    }
				    catch(IOException e) {
                    	FileInformationForm.txtInforamtion.append("\nUnable to open file" + e);
                         return;
                    }
                    try {
                        File fileInput = new File(fileName);
                        if(fileInput.exists()) {
                        
                        }
                    }
                    catch (Exception e) {
                    	FileInformationForm.txtInforamtion.append("EXception "+e);
                    }
 
               }
 
          }
 
          catch (IOException e) {
        	  FileInformationForm.txtInforamtion.append("EXception "+e);
          }
     }
}

package FileTransferServer;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import serverside.*;


public class FTPServerMain extends JFrame implements ActionListener{
	static final long serialVersionUID = 101;
	 static JDesktopPane desk;

	public FTPServerMain() {
	 desk = new JDesktopPane();
		setJMenuBar(setMenuBar());
		setContentPane(desk);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setSize(1020,730);
		setVisible(true);
		desk.add(new FileInformationForm());
                //ServerSideApp.getApplication().hide(null);
                FTPServer fTPServer = new FTPServer();
	
	}
	
	public static void main(String[] arc) {
        FTPServerMain fTPServerMain = new FTPServerMain();
	}
	
	public void actionPerformed(ActionEvent ae) {
		if(ae.getActionCommand().equals("Exit")){
			System.exit(0);
		}
	}
	private JMenuBar setMenuBar() {
		JMenuBar mbr = new JMenuBar();
		JMenu mnuFile;
		JMenuItem mnuExit;
		
		mnuFile = new JMenu("File");
		mnuExit = new JMenuItem("Exit",'x');
		mnuFile.add(mnuExit);
		mnuFile.setMnemonic('f');
		
		mbr.add(mnuFile);
		
		
		mnuExit.addActionListener(this);
		
		return mbr;
	}
}

package FileTransferServer;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Toolkit;

import javax.swing.JInternalFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.border.CompoundBorder;
import javax.swing.border.EtchedBorder;
import javax.swing.border.TitledBorder;


public class FileInformationForm extends JInternalFrame{
	static final long serialVersionUID = 101;
	static JTextArea txtInforamtion;
	JScrollPane pane;
	public FileInformationForm() {
		
		toInitialize();
		
		Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
		setBounds((dim.width-600)/2,(dim.height-510)/2,600,510);
		setTitle("File Information");
		setVisible(true);
	}

	private void toInitialize() {
		txtInforamtion = new JTextArea();
		pane = new JScrollPane(txtInforamtion);
		
		getContentPane().setLayout(null);
		getContentPane().add(pane);
		
		txtInforamtion.setBackground(Color.black);
		txtInforamtion.setForeground(Color.green);
		txtInforamtion.setEditable(false);
		
		pane.setBorder(new CompoundBorder(new TitledBorder("FileInformation"),new EtchedBorder()));
		pane.setBounds(50,100, 500,300);
	}
}

this is my code which gets hang when i call it via another form.
plz tell me what wrong wid this or what should i do?

[Fubarable]

Read up on threading and Swing because it looks like you're trying to call long-running tasks on the Swing event thread or EDT which will freeze this thread and cause your application to become completely unresponsive. You can find out more in this tutorial: Concurrency in Swing

[rungtashubham]

thanx but i have followed all the steps mention in this link.. still getting same problem... :(

[Fubarable]

thanx but i have followed all the steps mention in this link.. still getting same problem... :(

Then show us your most recent SSCCE, and let's see if we can help you out further.

[Norm]

Does the FTPServer constructor return to where is is called in the FTPServerMain constructor?