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MessagingClient.java
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212 lines (183 loc) · 7.02 KB
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package com.demo;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
public class MessagingClient extends JFrame {
private static final String SERVER_HOST = "localhost";
private static final int SERVER_PORT = 8093;
private Socket socket;
private BufferedReader reader;
private PrintWriter writer;
private String username;
// GUI Components
private JTextArea chatArea;
private JTextField messageField;
private JButton sendButton;
private JButton connectButton;
private JTextField usernameField;
private boolean connected = false;
public MessagingClient() {
initializeGUI();
}
private void initializeGUI() {
setTitle("Java Messaging Application");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(600, 400);
setLocationRelativeTo(null);
// Create components
chatArea = new JTextArea();
chatArea.setEditable(false);
chatArea.setFont(new Font(Font.MONOSPACED, Font.PLAIN, 12));
JScrollPane scrollPane = new JScrollPane(chatArea);
scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
// Top panel for connection
JPanel topPanel = new JPanel(new FlowLayout());
topPanel.add(new JLabel("Username:"));
usernameField = new JTextField(15);
topPanel.add(usernameField);
connectButton = new JButton("Connect");
topPanel.add(connectButton);
// Bottom panel for messaging
JPanel bottomPanel = new JPanel(new BorderLayout());
messageField = new JTextField();
messageField.setEnabled(false);
sendButton = new JButton("Send");
sendButton.setEnabled(false);
bottomPanel.add(messageField, BorderLayout.CENTER);
bottomPanel.add(sendButton, BorderLayout.EAST);
// Layout
setLayout(new BorderLayout());
add(topPanel, BorderLayout.NORTH);
add(scrollPane, BorderLayout.CENTER);
add(bottomPanel, BorderLayout.SOUTH);
// Event listeners
connectButton.addActionListener(e -> toggleConnection());
sendButton.addActionListener(e -> sendMessage());
messageField.addActionListener(e -> sendMessage());
// Window closing event
addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
disconnect();
System.exit(0);
}
});
}
private void toggleConnection() {
if (!connected) {
connect();
} else {
disconnect();
}
}
private void connect() {
username = usernameField.getText().trim();
if (username.isEmpty()) {
JOptionPane.showMessageDialog(this, "Please enter a username!");
return;
}
try {
socket = new Socket(SERVER_HOST, SERVER_PORT);
reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
writer = new PrintWriter(socket.getOutputStream(), true);
// Send username to server
writer.println("USERNAME:" + username);
// Start listening for messages
new Thread(this::listenForMessages).start();
// Update GUI
connected = true;
connectButton.setText("Disconnect");
usernameField.setEnabled(false);
messageField.setEnabled(true);
sendButton.setEnabled(true);
messageField.requestFocus();
appendToChat("Connected to server as " + username);
} catch (IOException e) {
JOptionPane.showMessageDialog(this, "Failed to connect to server: " + e.getMessage());
}
}
private void disconnect() {
if (connected) {
connected = false;
try {
if (writer != null) writer.close();
if (reader != null) reader.close();
if (socket != null) socket.close();
} catch (IOException e) {
e.printStackTrace();
}
// Update GUI
connectButton.setText("Connect");
usernameField.setEnabled(true);
messageField.setEnabled(false);
sendButton.setEnabled(false);
appendToChat("Disconnected from server");
}
}
private void sendMessage() {
if (connected && writer != null) {
String message = messageField.getText().trim();
if (!message.isEmpty()) {
writer.println("MESSAGE:" + message);
appendToChat("You: " + message);
messageField.setText("");
messageField.requestFocus();
}
}
}
private void listenForMessages() {
try {
String message;
while (connected && (message = reader.readLine()) != null) {
final String msg = message;
SwingUtilities.invokeLater(() -> {
if (msg.startsWith("MESSAGE:")) {
appendToChat(msg.substring(8));
} else if (msg.startsWith("SYSTEM:")) {
appendToChat("*** " + msg.substring(7) + " ***");
} else if (msg.startsWith("HISTORY:")) {
appendToChat(msg.substring(8));
}
});
}
} catch (IOException e) {
if (connected) {
SwingUtilities.invokeLater(() -> {
appendToChat("Connection lost!");
disconnect();
});
}
}
}
private void appendToChat(String message) {
chatArea.append(message + "\n");
chatArea.setCaretPosition(chatArea.getDocument().getLength());
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
}
new MessagingClient().setVisible(true);
});
}
}