i try to write simple messenger look like it's example in book(Java How To Program 9th Edition Paul Deitel Harvey Deitel, part 27.6). after i finished , i try to test it. it work on localhost(127.0.0.1), also work on computer which connect same modem (i mean ips such 192.168.0.1 and etc) but when i want to test it on some computer cross the internet a client side code got connection refused error. i think when i client(which is my friend in somewhere in my city) try to connect server(which is me, again some where in city), when he enter my ip to connect me he connect to my modem and my modem don't send it's information to me(it's hard to explain something that u can't deeply understand it in none mother language so i'm sorry at all ) any help is important to me.
here is server code
//:D
//hello every Body:! this is my first program which use some networks !!! :-khatkeif
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.net.ServerSocket;
import java.awt.BorderLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.io.IOException;
import java.io.EOFException;
public class Server extends JFrame
{
JTextField enteredText;//input message from user
JTextArea displayArea;//display information to user
ObjectInputStream input;//input object from cilent
ObjectOutputStream output;//output Object to client
ServerSocket server;//server Socket
Socket connection;//connecton to cilent
public Server()//constructor
{
super("Server");
setLayout(new BorderLayout(5,5));
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
add(new JLabel("Server Messenger"),BorderLayout.NORTH);
enteredText= new JTextField("entered message here");
enteredText.setEditable(false);
enteredText.addActionListener(new TextHandler());
add(enteredText,BorderLayout.SOUTH);
displayArea= new JTextArea();
displayArea.setEditable(false);
add(new JScrollPane(displayArea),BorderLayout.CENTER);
setSize(500,500);
setVisible(true);
}
public void runServer()
{
try
{
server = new ServerSocket(12345,10);//create server Socket
while(true)
{
waitForConnection();//wait util a client want to connect
openStreams();//open streams for send/get data
processConnection();//recive message from client
}
}
catch(IOException ioe)
{
ioe.printStackTrace();
}
}
public void waitForConnection() throws IOException
{
displayMessage("waiting for client");
connection=server.accept();//alow server for connection
displayMessage("connect to "+connection.getInetAddress().getHostName());
}
public void openStreams() throws IOException//open stream that help me to send and recive message
{
displayMessage("setting I/O");
output= new ObjectOutputStream(connection.getOutputStream());//create output to send message
output.flush();//send headers to client
input = new ObjectInputStream(connection.getInputStream());//create input from client message
displayMessage("Got I/O");
}
public void processConnection() throws IOException//recive message from client & alow server to send message to client
{
try
{
displayMessage("connected successfully");
setTextEditable(true);//alow server to send message to client
String reciveMessage = (String)input.readObject();//recive message form client
while(!reciveMessage.equals("TERMINATE"))//if client send this string,make process connection finish
{
displayMessage(connection.getInetAddress().getHostName()+">>> "+reciveMessage);//display clinet message in display erea
reciveMessage=(String)input.readObject();//read next message
}
}
catch(ClassNotFoundException cnfe)
{
cnfe.printStackTrace();
}
displayMessage(connection.getInetAddress().getHostName()+" disconnect`");
close();
}
public void close() throws IOException//close every thing
{
sendMessage("TERMINATE");
input.close();
output.close();
connection.close();
setTextEditable(false);
displayMessage("connection terminated");
}
public void setTextEditable(final boolean val)//set text field editable
{
SwingUtilities.invokeLater
(
new Runnable()
{
public void run()
{
enteredText.setEditable(val);
}
}
);
}
public void displayMessage(final String message)//display message in displayArea
{
SwingUtilities.invokeLater(
new Runnable()
{
public void run()
{
displayArea.append(message+"\n");
}
}
);
}
public void sendMessage(String message) throws IOException//send message to client
{
output.writeObject(message);
output.flush();
displayMessage("Me>>> "+message);
enteredText.setText("");
}
private class TextHandler implements ActionListener//when user press enter a text in enteredText send to client
{
public void actionPerformed(ActionEvent ev)
{
try
{
sendMessage(ev.getActionCommand());
}
catch(IOException ioe)
{
ioe.printStackTrace();
}
}
}
}
and it's main
//:D
public class ServerRun
{
public static void main(String[] args)
{
Server server = new Server();
server.runServer();
}
}
let's go for client code :D
//:D
//this is client side
import java.awt.BorderLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JTextArea;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.net.InetAddress;
public class Client extends JFrame
{
JTextField enteredText;//user input message
JTextArea displayArea;//display information
ObjectOutputStream output;//send message to server
ObjectInputStream input;//recive message from server;
Socket connection;//connection to server
String serverInfo;//server name
JButton closeB;
JPanel downPanel;
public Client ()
{
super("Client");
setLayout(new BorderLayout(5,5));
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
add(new JLabel("Client Messenger"),BorderLayout.NORTH);
enteredText= new JTextField("Enter message Here");
setTextEditable(false);
enteredText.addActionListener(
new ActionListener()
{
public void actionPerformed(ActionEvent ev)
{
try
{
sendMessage(ev.getActionCommand());
}
catch(IOException ioe)
{
ioe.printStackTrace();
}
}
}
);
closeB= new JButton("close");
closeB.addActionListener(
new ActionListener()
{
public void actionPerformed(ActionEvent ev)
{
try
{
close();
}
catch(IOException ioe)
{
ioe.printStackTrace();
}
}
}
);
downPanel= new JPanel(new BorderLayout(5,5));
downPanel.add(enteredText,BorderLayout.CENTER);
downPanel.add(closeB,BorderLayout.EAST);
add(downPanel,BorderLayout.SOUTH);
displayArea= new JTextArea();
displayArea.setEditable(false);
add(new JScrollPane(displayArea),BorderLayout.CENTER);
setSize(500,500);
setVisible(true);
}
public void runClient(String host)//run client program
{
try
{
connectToServer(host);
openStreams();
processConnection();
}
catch(IOException ioe)
{
ioe.printStackTrace();
}
}
public void connectToServer(String host) throws IOException//connect to server
{
displayMessage("connceting to " + host);
connection = new Socket(InetAddress.getByName(host),12345);//create connection to server
}
public void openStreams() throws IOException // open streams for recive/send messages
{
output= new ObjectOutputStream( connection.getOutputStream());//create output for send messages
output.flush();//send headers
input = new ObjectInputStream(connection.getInputStream());//create input for recive messages
displayMessage("connected to "+connection.getInetAddress().getHostName());
}
public void processConnection()throws IOException //recive message util server trminate
{
try
{
setTextEditable(true);//alow user to send message
String reciveMessage=(String) input.readObject();
while(!reciveMessage.equals("TERMINATE"))
{
displayMessage(connection.getInetAddress().getHostName()+">>> "+reciveMessage);
reciveMessage=(String)input.readObject();
}
displayMessage("connection lost");
}
catch(ClassNotFoundException cnfe)
{
displayMessage("server message is not clear");
}
}
public void close() throws IOException//close every thing
{
sendMessage("TERMINATE");
input.close();
output.close();
connection.close();
System.exit(0);
}
public void sendMessage(String message) throws IOException//send message to server
{
output.writeObject(message);//send message to server
output.flush();//send headers
displayMessage("Me>>> "+message);//displate sent message to user
enteredText.setText("");
}
public void displayMessage(final String message)
{
SwingUtilities.invokeLater(
new Runnable()
{
public void run()
{
displayArea.append(message+"\n");
}
}
);
}
public void setTextEditable(final boolean val)
{
SwingUtilities.invokeLater(
new Runnable()
{
public void run()
{
enteredText.setEditable(val);
}
}
);
}
}
and it's main :
//:D
import javax.swing.JOptionPane;
public class ClientRun
{
public static void main(String args[])
{
Client client = new Client();
client.runClient(JOptionPane.showInputDialog(null,"please enter host IP:"));
}
}
again thanks
