Exception Connection Refused

[Pedro Fonseca]

I'm currently doing some server-related exercises, but can't make my localhost accept connections.

I'm using a MacBook Pro running Snow Leopard, the apache is turned on, firewall was off (I did try to turn it on and tell it to enable incoming connections, but didn't work) and I have Growl installed (tried disabling it already).

Here's the code I'm using:

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

public class SimpleChatClientA {
  JTextField outgoing;
  PrintWriter writer;
  Socket sock;

  public void go() {
    // make gui and register a listener with the send button
    // call the setUpNetworking() method
    JFrame frame = new JFrame("Ludicrously Simple Chat Client");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JPanel mainPanel = new JPanel();
    outgoing = new JTextField(20);
    JButton sendButton = new JButton("Send");
    sendButton.addActionListener(new SendButtonListener());
    mainPanel.add(outgoing);
    mainPanel.add(sendButton);
    frame.getContentPane().add(BorderLayout.CENTER, mainPanel);
    setUpNetworking();
    frame.setSize(400,500);
    frame.setVisible(true);
  }

  private void setUpNetworking() {
    // make a Socket, then make a PrintWriter
    // assign the PrintWriter to writer instance variable
    try {
      sock = new Socket("127.0.0.1", 5000);
      writer = new PrintWriter(sock.getOutputStream());
      System.out.println("networking established");
    } catch (IOException ex) {
      ex.printStackTrace();
    }
  }

  public class SendButtonListener implements ActionListener {
    public void actionPerformed(ActionEvent ev) {
      // get the text from the text field and
      // send it to the server using the writer (a PrintWriter)
      try {
        writer.println(outgoing.getText());
        writer.flush();
      } catch(Exception ex) {
        ex.printStackTrace();
      }
      outgoing.setText("");
      outgoing.requestFocus();
    }
  }

  public static void main(String[] args) {
    new SimpleChatClientA().go();
  }
}

And here's the exception stack

java.net.ConnectException: Connection refused
	at java.net.PlainSocketImpl.socketConnect(Native Method)
	at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
	at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:432)
	at java.net.Socket.connect(Socket.java:529)
	at java.net.Socket.connect(Socket.java:478)
	at java.net.Socket.<init>(Socket.java:375)
	at java.net.Socket.<init>(Socket.java:189)
	at SimpleChatClientA.setUpNetworking(SimpleChatClientA.java:33)
	at SimpleChatClientA.go(SimpleChatClientA.java:24)
	at SimpleChatClientA.main(SimpleChatClientA.java:57)

Searching around I found this command line to test the connection, but it gives me a connection refused too.

telnet localhost 5000

[Matthew Brown]

So do you actually have anything listening for port 5000?

[Pedro Fonseca]

I guess I don't...?

Gotta be honest, I'm yet to properly wrap my head around everything regarding connections, I understand the very basic bare bones (if that much).

EDIT: How can I add a listener to that code so it allows me to test it?

Something like printing the sent message on the terminal window, but anything will do.