Running networking in background

Question

Hi,
I've been working on a school project that needs networking, its a basic cafeteria program, where you can order from client pc's and your order is sent to the server where employees would see it. I'm having trouble making the server loop so that it i can receive unlimited orders, but it has to run in the background so that i can stop the server from a button
here is my coding: (its done in netbeans)
import java.io.*;
import java.net.*;
import java.util.*;
import javax.swing.*;
* @author Eben
public class ServerStatus extends javax.swing.JFrame {
    private final int PORT = 3308;
    ServerSocket servSock;
    Socket sock ;
private String e = "";
    /** Creates new form ServerStatus */
    public ServerStatus() throws IOException {
       class Task extends SwingWorker{
            @Override
            protected Object doInBackground() throws Exception {
              run();
              return null;
        initComponents();
    public void run() throws IOException
      while(sock.isConnected()){
                servSock = new ServerSocket(PORT);
                System.out.println("Waiting for a Connection ... ");
                sock = servSock.accept();
                System.out.println("Connection established with client " + sock.getInetAddress().getHostName());
                String reply = "Order was received";
                String echoLine, echoLine1, echoLine2, echoLine3, echoLine4, echoLine5, echoLine6, echoLine7, echoLine8, echoLine9;
                try {
                    System.out.println("1");
                    Scanner inFromClient = new Scanner(new InputStreamReader(sock.getInputStream()));
                    PrintWriter outToClient = new PrintWriter(new OutputStreamWriter(sock.getOutputStream()), true);
                    System.out.println("2");
                    echoLine1 = inFromClient.nextLine();
                    echoLine2 = inFromClient.nextLine();
                    echoLine3 = inFromClient.nextLine();
                    echoLine4 = inFromClient.nextLine();
                    echoLine5 = inFromClient.nextLine();
                    echoLine6 = inFromClient.nextLine();
                    echoLine7 = inFromClient.nextLine();
                    echoLine8 = inFromClient.nextLine();
                    echoLine9 = inFromClient.nextLine();
                    echoLine = echoLine1 + "\n" + echoLine2 + "\n" + echoLine3 + "\n" + echoLine4 + "\n" + echoLine5 + "\n" + echoLine6 + "\n" + echoLine7 + "\n" + echoLine8 + "\n" + echoLine9;
                    System.out.println("3");
                    JOptionPane.showMessageDialog(null, "Order from " + sock.getInetAddress().getHostName() + echoLine, "New Order Received", JOptionPane.INFORMATION_MESSAGE);
                    System.out.println("4");
                    outToClient.print(reply);
                    sock.close();
                    servSock.close();
                    servSock = new ServerSocket(PORT);
                    sock = servSock.accept();     } catch (Exception ex) {
                    System.out.print(ex);
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {
        jLabel1 = new javax.swing.JLabel();
        StopServer = new javax.swing.JButton();
        jLabel1.setText("jLabel1");
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        StopServer.setText("Stop Server");
        StopServer.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                StopServerActionPerformed(evt);
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(301, Short.MAX_VALUE)
                .addComponent(StopServer)
                .addContainerGap())
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(266, Short.MAX_VALUE)
                .addComponent(StopServer)
                .addContainerGap())
        pack();
    }// </editor-fold>
    private void StopServerActionPerformed(java.awt.event.ActionEvent evt) {
        try {
            sock.close();
            servSock.close();
        } catch (IOException ex) {
     * @param args the command line arguments
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    new ServerStatus().setVisible(true);
                } catch (Exception ex) {
    // Variables declaration - do not modify
    private javax.swing.JButton StopServer;
    private javax.swing.JLabel jLabel1;
    // End of variables declaration
}

Answer 1

The loop in the run method contains so many odd things, so I don't know where to begin.
E.g. why do you have a while loop that checks sock.isConnected(). What do you expect it to do? Why are you creating and closing a ServerSocket at each iteration? Why are you reading 9 lines? Why have you mixed UI and communication code?