Modified KnockKnockClient as a type of Telnet

Question

I modified the KnockKnockClient.java from Sun's custom networking tutorial found here: http://java.sun.com/docs/books/tutorial/networking/index.html
I'm submitting this for those of us who need a good start on making a Telnet-like client.
I've added a GUI to the original code along with a thread for the client to constantly recieve strings from the server without having to send a string for each string from the server.
   import java.io.*;
   import java.net.*;
   import java.awt.*;
   import javax.swing.*;
   import java.awt.event.*;
   import java.awt.BorderLayout;
   import javax.swing.text.*;
   public class Client extends JFrame implements ActionListener, Runnable{
      private JTextArea main;
      private JScrollPane scrollPane;
      private JTextField tField;
      private Container content;
      public Thread m_Server = null;
      private String fromServer, fromUser, hostName;
      private static Socket kkSocket = null;
      private static PrintWriter out = null;
      private static BufferedReader in = null;
      private int getHost = 0, hostPort;
      private JTextPane pane;
      private SimpleAttributeSet set;
      private Document doc;
      public Client()
         content = getContentPane();
         content.setLayout(new BorderLayout());
         tField = new JTextField(9);
         tField.addActionListener(this);
         content.add(tField, BorderLayout.SOUTH);
         pane = new JTextPane();
         set = new SimpleAttributeSet();
         set.addAttribute(StyleConstants.CharacterConstants.Bold, Boolean.TRUE);
      // Initialize attributes before adding text
         pane.setCharacterAttributes(set, true);
         //pane.setText("Three");
         set = new SimpleAttributeSet();
         StyleConstants.setItalic(set, false);
         StyleConstants.setForeground(set, Color.BLACK);
         StyleConstants.setBackground(set, Color.WHITE);
         doc = pane.getStyledDocument();
         set = new SimpleAttributeSet();
         StyleConstants.setFontSize(set, 12);
         JScrollPane scrollPane = new JScrollPane(pane);
         content.add(scrollPane, BorderLayout.CENTER);
         scrollPane.setWheelScrollingEnabled(true);
         scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
         scrollPane.setPreferredSize(new Dimension(200, 700));
         pane.setFont(new Font("Courier", Font.PLAIN, 12));
         try {
            doc.insertString(doc.getLength(), "Enter host name: ", set);}
            catch (BadLocationException e) {
               System.err.println("Bad location");
               return;}
         getHost=1;
         tField.requestFocus();
      Object mylock = new Object();
      private void scroll()
         /*if(pane.getLineCount() >= 100)
            pane.replaceRange(null, 0, 95);
         int pos = pane.getText().length();
         synchronized(mylock)
            //pane.setCaretPosition(pos);
            pane.setCaretPosition(doc.getLength());
      private void startPlay() throws IOException
         try {
            kkSocket = new Socket(hostName, hostPort);
            out = new PrintWriter(kkSocket.getOutputStream(), true);
            in = new BufferedReader(new InputStreamReader(kkSocket.getInputStream()));
            catch (UnknownHostException e) {
               System.err.println("Don't know about host: "+hostName+".");
               System.exit(1);}
            catch (IOException e) {
               System.err.println("Couldn't get I/O for the connection to: "+hostName+".");
               System.exit(1);}
         start();
      public void actionPerformed(ActionEvent e)
         if(getHost==1)
            hostName = tField.getText();
            getHost=2;
            //pane.append(hostName+"\nEnter port: ");
            try {
               doc.insertString(doc.getLength(), hostName+"\nEnter port: ", set);}
               catch (BadLocationException f)
                  System.err.println("Bad location");
                  return;}}
         else if(getHost==2)
            hostPort = Integer.parseInt(tField.getText());
            getHost=0;
            //pane.append(""+hostPort+"\n\n\n");
            try {
               doc.insertString(doc.getLength(), ""+hostPort+"\n\n\n", set);}
               catch (BadLocationException f)
                  System.err.println("Bad location");
                  return;}
            try{
               startPlay();}
               catch (UnknownHostException f) {
                  System.err.println("Problem at startPlay()");
                  System.exit(1);}
               catch (IOException f) {
                  System.err.println("I/O problem at startPlay()");
                  System.exit(1);}}
         else if(getHost==0)
            fromUser = tField.getText();
            //pane.append("//"+fromUser+"\n");
            try {
               doc.insertString(doc.getLength(), fromUser+"\n", set);}
               catch (BadLocationException f)
                  System.err.println("Bad location");
                  return;}
            out.println(fromUser);
         //start();
         tField.selectAll();
      public void start()
         if(m_Server == null)
            m_Server = new Thread(this, "Server");
            m_Server.start();}}
      public void stop()      
         m_Server=null;
         try{
            Quit();}
            catch (UnknownHostException e) {
               System.err.println("Unknown Quit()");
               System.exit(1);}
            catch (IOException e) {
               System.err.println("Couldn't get I/O for Quit()");
               System.exit(1);}     
   //This "parser" is going to be used for ANSI color code parsing
   //from the string sent from the server.  It does nothing right
   //now, really.  ?? means new line for some MUDs. is a
   //square character that doesn't need to be in the string.
      private void parser()
         fromServer = fromServer.replaceAll("??","\n");
      //[0;37m[32mH:2799 [37m[1;33mM:1953 [0;37m[1;31mB:100% [0;37m[eb]
         //jack = "[37m[32mH:2799 [37m[1;33mM:1953 [0;37m[1;31mB:100% [0;37m[eb]";
         fromServer = fromServer.replaceAll("","");
         //fromServer = fromServer.replaceAll("","");
         try {
            doc.insertString(doc.getLength(), fromServer+"\n", set);}
            catch (BadLocationException f)
               System.err.println("Bad location");
               return;}
      public void run()
         Thread m_Server =  Thread.currentThread();
         Thread thisThread = Thread.currentThread();
         while(thisThread == m_Server)
            try
               fromServer = in.readLine();}
               catch (UnknownHostException e) {
                  System.err.println("Unknown in.readLine()");
                  System.exit(1);}
               catch (IOException e) {
                  System.err.println("Couldn't get I/O for the connection to: in.readLine()");
                  System.exit(1);}
            if(fromServer != null)
               parser();
            scroll();
      private void Quit() throws IOException
         out.close();
         in.close();
         kkSocket.close();}
      public static void main(String[] args) throws IOException {
         Client window = new Client();
         window.setSize(800, 640);
         window.setLocation(0, 0);
         window.setTitle("MMC v0.01c");
         window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         window.requestFocus();
         window.setVisible(true);
   }

Answer 1

Modify parser() it won't work because of this forum doesn't support special characters.
   private void parser(){
     try {
        doc.insertString(doc.getLength(), fromServer+"\n", set);
     catch (BadLocationException f) {
        System.err.println("Bad location");
        return;
   }If you modify the parser() method, you won't get a metta-tag error.