SimpleChatClient.java

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

public class SimpleChatClient{
    JTextArea incoming;
    JTextField outgoing;
    BufferedReader reader;
    PrintWriter writer;
    Socket sock;
    String name;
    
    public static void main(String[] args){
        SimpleChatClient client = new SimpleChatClient();
        client.go();
    }
    
    public void go(){
        JFrame frame = new JFrame("Simple Chat Client");
        JPanel mainPanel = new JPanel();
        
        incoming = new JTextArea(15,40);
        incoming.setLineWrap(true);
        incoming.setWrapStyleWord(true);
        incoming.setEditable(false);
        
        JScrollPane qScroller = new JScrollPane(incoming);
        qScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
        qScroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
        
        outgoing = new JTextField(20);
        JButton sendButton = new JButton("Send!");
        sendButton.addActionListener(new SendButtonListener());
        
        JButton nameButton = new JButton("Set your name!");
        nameButton.addActionListener(new NameButtonListener());
        
        mainPanel.add(nameButton);
        mainPanel.add(qScroller);
        mainPanel.add(outgoing);
        mainPanel.add(sendButton);
        
        
        setUpNetworking();
        
        Thread readerThread = new Thread(new IncomingReader());
        readerThread.start();
        
        frame.getContentPane().add(BorderLayout.CENTER, mainPanel);
        frame.setSize(600, 300);
        frame.setVisible(true);     
    } // close go
    
    private void setUpNetworking(){
        try{
            sock = new Socket("127.0.0.1", 5000);
            InputStreamReader streamReader = new InputStreamReader(sock.getInputStream());
            reader = new BufferedReader(streamReader);
            writer = new PrintWriter(sock.getOutputStream());
            System.out.println("networking established");
            
        } catch(IOException ex){
            ex.printStackTrace();
        }
    } // close setUpNetworking
    
    public class SendButtonListener implements ActionListener{
        public void actionPerformed(ActionEvent ev){
            try{
                writer.println(name + " said: " +outgoing.getText());
                writer.flush();
            } catch(Exception ex){
                ex.printStackTrace();
            }
            outgoing.setText("");
            outgoing.requestFocus();
        }
    } //close inner class
    
    public class NameButtonListener implements ActionListener{
        public void actionPerformed(ActionEvent ev){
            name = JOptionPane.showInputDialog("What is your name?", null);
        }
    } //close inner class
    
    public class IncomingReader implements Runnable{
        public void run(){
            String message;
            try{
                while((message = reader.readLine()) != null){
                    System.out.println("read " + message);
                    incoming.append(message + "\n");
                    
                } //close while
            } catch (Exception ex) { ex.printStackTrace();}
            
        } //close run
    } // close inner class   
}