So, i am trying to create a Client Server chat program. Since, i don't have an external server so my client and server will be hosted in my computer. Now, i was following online tutorials and created the Server side of the chat program but then i get an error while i test the Server side of the program. When i create the server socket, what port number should i put if i am using my computer. I used a random number and i get the following errors:- Can someone please help me to fix the error or suggest me what should i do? Thanks
This is my Server class:-
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.*;
import java.io.*;
import java.awt.*;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class Server extends JFrame {
private JTextField usertext;
private JTextArea chatwindow;
private ObjectOutputStream output;
private ObjectInputStream input;
private ServerSocket server;
private Socket connection;
public Server()
{
super("Missy's Instant Messenger");//This sets the title of the messenger window
usertext = new JTextField(); //this is for creating the textfield where the user will enter data
usertext.setEditable(false);//this is set to false such that the user can only send message if he is connected to someone
usertext.addActionListener( //this activity is for sending the message when the user clicks on enter
new ActionListener(){
public void actionPerformed(ActionEvent event){
sendMessage(event.getActionCommand());
usertext.setText(" ");
}
/* private void sendMessage(String string) {
// TODO Auto-generated method stub
}*/
});
add(usertext,BorderLayout.NORTH);
chatwindow = new JTextArea();
add(new JScrollPane(chatwindow));
setSize(500,500);
}
public void startrunning(){
try {
server = new ServerSocket(6800,100);
//6789 is the port number and 100 is the number of people that can wait in the queue to connect to the server
while(true)
{
try{
waitforConnection();//this is to connect to the server
setupStreams();//setting up the input and output streams to send and receive messages
whilechatting();//this is allow to send messages using the input and output streams
}catch (Exception e)
{
showMessage("Connection has ended");//this will be displayed when the connection is ended by the server
}finally{
closecrap(); //close all the streams and sockets
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void waitforConnection() throws IOException
{
showMessage("waiting for someone to connect.....");
connection = server.accept(); //this will connect the server and the client
showMessage("Now connected to "+connection.getInetAddress().getHostName());
}
private void setupStreams() throws IOException
{
output = new ObjectOutputStream(connection.getOutputStream());
output.flush();
input = new ObjectInputStream(connection.getInputStream());
showMessage("Your streams are now set up......");
}
private void whilechatting() throws IOException
{
String message = "You are now connected";
sendMessage(message);
abletotype(true);
do{
try{
message = (String)input.readObject();
showMessage("\n" +message);
}catch(ClassNotFoundException e)
{
showMessage("wtf is that");
}
}while(!message.equals("CLIENT END"));
}
private void showMessage(final String a)
{
SwingUtilities.invokeLater(
new Runnable(){
public void run(){
chatwindow.append(a);
}
}
);
// System.out.println(a);
}
public void closecrap()
{
showMessage("\n Connections closing .....");
abletotype(false);
try{
output.close();
input.close();
connection.close();
}catch(IOException ioException)
{
ioException.printStackTrace();
}
}
public void sendMessage(String message)
{
try{
output.writeObject("SERVER - "+message);//this is where you put the message in the output stream
output.flush(); //flush out the junk if there is any left
showMessage("\nSERVER -"+message); //show Message in the chat window
}catch(Exception e)
{
chatwindow.append("\n ERROR sending the message dude");
}
}
private void abletotype(final Boolean t)
{
SwingUtilities.invokeLater(
new Runnable(){
public void run(){
usertext.setEditable(t);
}
}
);
}
}
Servertest class:-
import javax.swing.*;
public class ServerTest {
public static void main(String[] args) {
// TODO Auto-generated method stub
Server st = new Server();
st.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
st.startrunning();
}
}
References:- ThenewBoston.com
