Hi, I have just recently been teaching myself networking and threads in java and I have encountered a problem. I'm trying to make a server - client type chat room and I'm having trouble with a thread in the client code.
//ChitChatClient
import java.io.*;
import java.net.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class ChitChatClient extends JFrame implements Runnable, ActionListener {
// Declares input/output variables
static Socket clientSocket = null;
static BufferedReader inFromServer = null;
static DataOutputStream outToServer = null;
static String input = "", output = "", strPort = "", username = "", numIp = "";
static int numPort = 0;
// Declares the gui objects
static JTextArea inputBox, displayBox, userList;
static JButton send, connect;
static JTextField ip, port, txtUsername;
JLabel lblIp, lblPort, lblUsername;
public ChitChatClient() {
super("ChitChatClient 2.0");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(null);
//frame.getContentPane().setBackground(Color.blue);
setBounds(400, 100, 600, 600);
setResizable(false);
// Make the inputBox
inputBox = new JTextArea();
inputBox.setLineWrap(true);
inputBox.setBorder(BorderFactory.createEmptyBorder(4, 4, 4, 4));
JScrollPane inputScroll = new JScrollPane(inputBox);
inputScroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
inputScroll.setBounds(20, 450, 440, 100);
// Makes the displayBox
displayBox = new JTextArea("");
displayBox.setBounds(20, 50, 350, 375);
displayBox.setLineWrap(true);
displayBox.setEditable(false);
JScrollPane displayScroll = new JScrollPane(displayBox);
displayScroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
displayScroll.setBounds(20, 50, 350, 375);
// Makes the button send
send = new JButton("Send");
send.setEnabled(false);
send.setBounds(480, 490, 100, 25);
send.addActionListener(this);
// Makes the connect button
connect = new JButton("Connect");
connect.setBounds(20, 10, 100, 25);
connect.addActionListener(this);
// Makes lblIp label
lblIp = new JLabel("Ip address:");
lblIp.setBounds(130, 10, 75, 25);
// Makes the lblPort label
lblPort = new JLabel("Port:");
lblPort.setBounds(310, 10, 50, 25);
// Makes the lblUsername label
lblUsername = new JLabel("Username:");
lblUsername.setBounds(400, 10, 75,25);
// Makes the ip JtextField
ip = new JTextField();
ip.setBounds(200, 15, 95, 20);
// Makes the port JTextField
port = new JTextField();
port.setBounds(345, 15, 40, 20);
// Makes the txtUsername JTextField
txtUsername = new JTextField();
txtUsername.setBounds(470, 15, 100, 20);
// Add objects to frame
add(inputScroll);
add(displayScroll);
add(send);
add(connect);
add(lblIp);
add(lblPort);
add(ip);
add(port);
add(lblUsername);
add(txtUsername);
repaint();
}
public void actionPerformed(ActionEvent e) {
if(e.getSource() == send) {
try {
output = inputBox.getText();
outToServer.writeBytes(username + ": " + output + "\n");
inputBox.setText("");
}
catch(IOException er) {}
}
else if(e.getSource() == connect) {
// Disable connection controls
connect.setEnabled(false);
ip.setEnabled(false);
port.setEnabled(false);
txtUsername.setEnabled(false);
// Assign connection variables
numIp = ip.getText();
strPort = port.getText();
numPort = Integer.parseInt(strPort);
username = txtUsername.getText();
// Creates socket to connect to the server
try {
displayBox.append("\nConnecting to server...");
clientSocket = new Socket(numIp, numPort);
}
catch(UnknownHostException er) {
displayBox.append("\nCan't connect to server.");
// Enable connection controls
connect.setEnabled(true);
ip.setEnabled(true);
port.setEnabled(true);
txtUsername.setEnabled(true); }
catch(IOException er) {
displayBox.append("\nCan't connect to server.");
// Enable connection controls
connect.setEnabled(true);
ip.setEnabled(true);
port.setEnabled(true);
txtUsername.setEnabled(true);
}
// Creates an input and output streams
try {
// Creates input from the server
inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
// Creates output from the server
outToServer = new DataOutputStream(clientSocket.getOutputStream());
}
catch (IOException er) {
System.out.println(er);
}
(new Thread(new ChitChatClient())).start();
}
}
public static void main(String args[]) throws Exception {
JFrame frame = new ChitChatClient();
frame.setVisible(true);
displayBox.append("Welcome to ChitChatClient Version 2.0");
// Reads the ip text file
File file = new File("ClientConfig.txt");
if (file.exists()) {
// Create a BufferedReader from the file
BufferedReader inFile = new BufferedReader(new java.io.FileReader(file));
// Reads the ip
numIp = inFile.readLine();
strPort = inFile.readLine();
username = inFile.readLine();
// Close the buffered reader input stream attached to the file
inFile.close();
// Put the variables in the JTextFields
ip.setText(numIp);
port.setText(strPort);
txtUsername.setText(username);
}
}
public void run() {
try {
displayBox.append("\nServer Connected");
send.setEnabled(true);
outToServer.writeBytes("User '" + username + "' has joined.\n");
while(true) {
input = inFromServer.readLine();
displayBox.append("\n" + input);
Toolkit.getDefaultToolkit().beep();
}
}
catch(IOException er) {
System.out.println(er);
}
finally {
try {
clientSocket.close ();
inFromServer.close();
outToServer.close();
}
catch (IOException ex) {
ex.printStackTrace ();
}
}
}
}
The GUI is a JFrame and is made in the constructor method. What I want to happen is when the user clicks the connect JButton, they connect to the server. I'm assuming I need a thread to handle everything coming in from the server so the user can interact with the GUI at the same time. I start the thread in the actionPerformed method (highlighted in blue). The text "Connecting to server..." shows up but when it gets to the thread it just stops and doesn't implement any of the code in the run() method. I had this program working without the GUI and is basically the same code. The only thing different that I can think of is I started the thread from the main method and not the actionPerformed method. Any help would be greatly appreciated.
Linear Mode
