Java Answers Forum - CLIENT SERVER PROBLEM

Articles |
News |
Weblogs |
Books |
Forums

Artima Forums | Articles | Weblogs | Java Answers | News

Sponsored Link •

Java Answers Forum
CLIENT SERVER PROBLEM

0 replies on 1 page.

Welcome Guest
Sign In

Back to Topic List

Reply to this Topic

Search Forum

Threaded View


Previous Topic		Next Topic

Flat View: This topic has 0 replies on 1 page

gordon

Posts: 2
Nickname: gordo
Registered: Apr, 2003

CLIENT SERVER PROBLEM

Posted: Apr 14, 2003 5:38 PM

OK, I've gotten this far on my own, but now I need a little help.

My program is supposed to allow a client to type in a file name in a JTextField and have the server return the file contents. The program does absolutely nothing. Both java files compile with no errors. First I run the server program. Then I open another MS-DOS window and run the client program. The GUI displays as expected. When I type in a file name (one that I created in the same directory to test the program) in the JTextField and press Enter, nothing happens.

Can you tell me why? The streams I am using to communicate between server and client and to read from a file are what I am required to use. Is there a problem with my streams? Is my connection on the client side coded correctly? Below is the code for server.java and client.java.

Thank you very much!

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

public class Server
{
private BufferedWriter output;
private BufferedReader input;
private Socket connection;
String str;

public void runServer ( )
{
int counter = 0;

try
{
ServerSocket server = new ServerSocket ( 8189 );

while ( counter < 2 )
{
connection = server.accept ( );
getStreams ( );
processConnection ( );
closeConnection ( );
counter++;
}
}

catch ( IOException ioException )
{
ioException.printStackTrace ( );
}
}

private void getStreams ( ) throws IOException
{
output = new BufferedWriter ( new OutputStreamWriter ( connection.getOutputStream ( ) ) );
output.flush ( );
input = new BufferedReader ( new InputStreamReader ( connection.getInputStream ( ) ) );
}

private void processConnection ( ) throws IOException
{
String fileName = input.readLine ( );
File file = new File ( fileName );
BufferedReader fileInput = new BufferedReader ( new InputStreamReader
( new FileInputStream ( file ) ) );
BufferedWriter writer = new BufferedWriter ( new FileWriter ( file ) );

while ( ( str = fileInput.readLine ( ) ) != null )
{
output.write ( str );
output.newLine ( );
}

output.flush ( );
writer.close ( );
}

private void closeConnection ( ) throws IOException
{
output.close ( );
input.close ( );
connection.close ( );
}

public static void main ( String [ ] args )
{
Server application = new Server ( );
application.runServer ( );
}
}

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

import javax.swing.*;

public class Client extends JFrame
{
private JTextField enterField;
private JButton saveButton;
private JTextArea displayArea;
private BufferedWriter output;
private BufferedReader input;
private Socket connection;

public Client ( )
{
super ( "Client" );
Container container = getContentPane ( );
JPanel panel = new JPanel ( );

JLabel displayLabel = new JLabel ( "Enter file name to retrieve: " );
panel.add ( displayLabel );

enterField = new JTextField ( 10 );
enterField.setEnabled ( false );

enterField.addActionListener (
new ActionListener ( )
{
public void actionPerformed ( ActionEvent event )
{
sendFile ( enterField.getText ( ) );
}

}

);

panel.add ( enterField );

saveButton = new JButton ( "Save Changes" );

saveButton.addActionListener (
new ActionListener ( )
{
public void actionPerformed ( ActionEvent event )
{
sendFile ( event.getActionCommand ( ) );
}

}

);

panel.add ( saveButton );

container.add ( panel, BorderLayout.NORTH );

displayArea = new JTextArea ( );
container.add ( new JScrollPane ( displayArea ), BorderLayout.CENTER );

setSize ( 500, 400 );
setVisible ( true );
}

public void runClient ( )
{
try
{
connection = new Socket ( InetAddress.getLocalHost ( ), 8189 );
getStreams ( );
processConnection ( );
closeConnection ( );
}

catch ( EOFException eofException )
{
System.out.println ( "Server terminated connection" );
}

catch ( IOException ioException )
{
ioException.printStackTrace ( );
}
}

private void getStreams ( ) throws IOException
{
output = new BufferedWriter ( new OutputStreamWriter ( connection.getOutputStream ( ) ) );
output.flush ( );
input = new BufferedReader ( new InputStreamReader ( connection.getInputStream ( ) ) );
}

private void processConnection ( ) throws IOException
{
String message;
enterField.setEnabled ( true );

while ( ( message = input.readLine ( ) ) != null)
{
displayArea.append ( message + "\n" );
}
}

private void closeConnection ( ) throws IOException
{
output.close ( );
input.close ( );
connection.close ( );
}

private void sendFile ( String message )
{
try
{
output.write ( message );
output.flush ( );
}

catch ( IOException ioException )
{
displayArea.append ( "\nError writing" );
}
}

public static void main ( String [ ] args )
{
Client application = new Client ( );
application.setDefaultCloseOperation ( JFrame.EXIT_ON_CLOSE );
application.runClient ( );
}

}

Previous Topic

Next Topic


	Web Artima.com