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https://github.com/guilhermewerner/redes
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Initial chat room
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Guilherme Werner
111
src/main/java/org/example/ClientApp.java
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111
src/main/java/org/example/ClientApp.java
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package org.example;
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import javax.swing.*;
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import java.awt.*;
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import java.awt.event.ActionEvent;
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import java.awt.event.ActionListener;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.io.PrintWriter;
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import java.net.Socket;
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public class ClientApp extends JFrame {
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private static final String SERVER_IP = "localhost";
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private static final int SERVER_PORT = 1234;
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private JTextArea chatArea;
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private JTextField messageField;
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private JButton sendButton;
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private Socket socket;
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private BufferedReader in;
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private PrintWriter out;
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public ClientApp() {
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setTitle("Chat Client");
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setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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setSize(400, 300);
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setLayout(new BorderLayout());
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chatArea = new JTextArea();
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chatArea.setEditable(false);
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add(new JScrollPane(chatArea), BorderLayout.CENTER);
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JPanel bottomPanel = new JPanel();
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bottomPanel.setLayout(new BorderLayout());
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messageField = new JTextField();
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bottomPanel.add(messageField, BorderLayout.CENTER);
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sendButton = new JButton("Send");
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sendButton.addActionListener(new ActionListener() {
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@Override
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public void actionPerformed(ActionEvent e) {
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sendMessage();
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}
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});
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bottomPanel.add(sendButton, BorderLayout.EAST);
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add(bottomPanel, BorderLayout.SOUTH);
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setVisible(true);
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connectToServer();
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startListening();
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}
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private void connectToServer() {
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try {
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socket = new Socket(SERVER_IP, SERVER_PORT);
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in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
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out = new PrintWriter(socket.getOutputStream(), true);
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chatArea.append("Connected to server\n");
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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private void startListening() {
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Thread thread = new Thread(new Runnable() {
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@Override
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public void run() {
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try {
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String serverMessage;
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while ((serverMessage = in.readLine()) != null) {
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chatArea.append("Server: " + serverMessage + "\n");
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}
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} catch (IOException e) {
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e.printStackTrace();
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} finally {
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try {
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in.close();
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out.close();
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socket.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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});
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thread.start();
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}
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private void sendMessage() {
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String message = messageField.getText().trim();
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if (!message.isEmpty()) {
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out.println(message);
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messageField.setText("");
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chatArea.append("You: " + message + "\n");
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}
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}
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public static void main(String[] args) {
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SwingUtilities.invokeLater(new Runnable() {
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@Override
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public void run() {
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new ClientApp();
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}
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});
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}
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}
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@ -1,19 +0,0 @@
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package org.example;
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// Press Shift twice to open the Search Everywhere dialog and type `show whitespaces`,
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// then press Enter. You can now see whitespace characters in your code.
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public class Main {
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public static void main(String[] args) {
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// Press Alt+Enter with your caret at the highlighted text to see how
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// IntelliJ IDEA suggests fixing it.
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System.out.println("Hello and welcome!");
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// Press Shift+F10 or click the green arrow button in the gutter to run the code.
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for (int i = 1; i <= 5; i++) {
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// Press Shift+F9 to start debugging your code. We have set one breakpoint
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// for you, but you can always add more by pressing Ctrl+F8.
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System.out.println("i = " + i);
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}
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}
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}
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92
src/main/java/org/example/ServerApp.java
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92
src/main/java/org/example/ServerApp.java
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package org.example;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.io.PrintWriter;
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import java.net.ServerSocket;
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import java.net.Socket;
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import java.util.ArrayList;
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import java.util.List;
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public class ServerApp {
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private static final int PORT = 1234;
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private List<ClientHandler> clients;
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public ServerApp() {
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clients = new ArrayList<>();
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}
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public void start() {
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try {
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ServerSocket serverSocket = new ServerSocket(PORT);
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System.out.println("Server started on port " + PORT);
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while (true) {
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Socket clientSocket = serverSocket.accept();
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System.out.println("New client connected: " + clientSocket);
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ClientHandler clientHandler = new ClientHandler(clientSocket);
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clients.add(clientHandler);
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clientHandler.start();
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}
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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private void broadcastMessage(String message, ClientHandler sender) {
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for (ClientHandler client : clients) {
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if (client != sender) {
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client.sendMessage(message);
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}
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}
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}
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private void removeClient(ClientHandler client) {
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clients.remove(client);
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}
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private class ClientHandler extends Thread {
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private Socket clientSocket;
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private BufferedReader in;
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private PrintWriter out;
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public ClientHandler(Socket socket) {
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this.clientSocket = socket;
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}
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@Override
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public void run() {
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try {
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in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
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out = new PrintWriter(clientSocket.getOutputStream(), true);
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String clientMessage;
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while ((clientMessage = in.readLine()) != null) {
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broadcastMessage(clientMessage, this);
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}
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} catch (IOException e) {
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e.printStackTrace();
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} finally {
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try {
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in.close();
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out.close();
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clientSocket.close();
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removeClient(this);
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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public void sendMessage(String message) {
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out.println(message);
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}
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}
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public static void main(String[] args) {
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ServerApp server = new ServerApp();
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server.start();
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}
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}
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