Merge PR 'HW-10-last-edition' (#1) from develop into main
Full Mark - No Bonus - Late Submission
This commit was merged in pull request #1.
This commit is contained in:
@@ -9,8 +9,8 @@
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<version>1.0-SNAPSHOT</version>
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<properties>
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<maven.compiler.source>25</maven.compiler.source>
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<maven.compiler.target>25</maven.compiler.target>
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<maven.compiler.source>21</maven.compiler.source>
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<maven.compiler.target>21</maven.compiler.target>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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@@ -1,19 +1,35 @@
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package com.university.chat.Client;
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public class ServerListener implements Runnable{
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// TODO: store the ObjectInputStream from the user socket
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// (this should be the same input stream the
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// chatClient created when connecting)
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import com.university.chat.Common.ChatMessage;
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import com.university.chat.Common.FileMessage;
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import com.university.chat.Common.MessageType;
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import java.io.ObjectInputStream;
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public class ServerListener implements Runnable {
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private final ObjectInputStream in;
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public ServerListener(ObjectInputStream in) {
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this.in = in;
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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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// TODO: In an infinite loop read objects from the server
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// - if it's a ChatMessage -> print "<sender>: <content>"
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// - if it's a FileMessage -> print that a file was received
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// (filename + sender), it's already
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// saved to disk by the server.
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} catch (Exception e){
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while (true) {
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Object obj = in.readObject();
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if (obj instanceof ChatMessage msg) {
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if (msg.getType() == MessageType.USER_LIST) {
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System.out.println("[Online users] " + msg.getContent());
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} else {
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System.out.println(msg.getSender() + ": " + msg.getContent());
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}
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} else if (obj instanceof FileMessage fileMsg) {
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System.out.println("[File received] '" + fileMsg.getFilename() + "' from " + fileMsg.getSender());
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}
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}
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} catch (Exception e) {
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System.out.println("Disconnected from server");
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}
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}
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@@ -1,29 +1,121 @@
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package com.university.chat.Client;
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public class chatClient {
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public static void main() {
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// TODO: Connecting to the server
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// 1. Create a socket and connect to the server
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// 2. Create an ObjectOutputStream (out) and ObjectInputStream (in)
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// from the socket's streams — output FIRST, then input.
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// 2. Get the username, and send a LOGIN ChatMessage with that username
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// 3. Start a new Thread running a ServerListener(in) so incoming
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// messages are handled concurrently.
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import com.university.chat.Common.ChatMessage;
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import com.university.chat.Common.FileMessage;
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import com.university.chat.Common.MessageType;
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while (true){
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try {
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// TODO: Program loop — read a line from the console and act on it:
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// - "/msg <user> <text>" -> build & send a PRIVATE_MESSAGE
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// - "/users" -> build & send a USER_LIST request
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// - "/sendfile <user> <path>" -> read the file into a byte[]
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// (you can use TransferProgress
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// to show progress)
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// and send it as a FileMessage
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// - anything else -> send a PUBLIC_MESSAGE
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// Remember to flush() the output stream after writeObject().
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} catch (Exception e){
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System.out.println("command failed: " + e.getMessage());
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import java.io.FileInputStream;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.net.Socket;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.util.Scanner;
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public class chatClient {
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private static final String SERVER_HOST = "localhost";
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private static final int SERVER_PORT = 12345;
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public static void main(String[] args) {
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try {
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Socket socket = new Socket(SERVER_HOST, SERVER_PORT);
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// Output stream MUST come first on both ends to avoid handshake deadlock
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ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream());
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out.flush();
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ObjectInputStream in = new ObjectInputStream(socket.getInputStream());
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Scanner scanner = new Scanner(System.in);
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System.out.print("Enter username: ");
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String username = scanner.nextLine().trim();
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out.writeObject(new ChatMessage(MessageType.LOGIN, username, null, null));
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out.flush();
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// Wait for login response before starting the listener
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Object resp = in.readObject();
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if (resp instanceof ChatMessage loginResp) {
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if (loginResp.getType() == MessageType.LOGIN_FAILED) {
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System.out.println("Login failed: " + loginResp.getContent());
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socket.close();
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return;
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}
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System.out.println(loginResp.getContent());
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}
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// Listener thread handles all incoming messages from now on
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Thread listener = new Thread(new ServerListener(in));
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listener.setDaemon(true);
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listener.start();
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System.out.println("Commands: /msg <user> <text> | /users | /sendfile <user> <path> | <text>");
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while (true) {
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try {
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String line = scanner.nextLine();
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if (line.startsWith("/msg ")) {
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String[] parts = line.split(" ", 3);
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if (parts.length < 3) {
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System.out.println("Usage: /msg <user> <text>");
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continue;
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}
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out.writeObject(new ChatMessage(MessageType.PRIVATE_MESSAGE, username, parts[1], parts[2]));
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out.flush();
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} else if (line.equals("/users")) {
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out.writeObject(new ChatMessage(MessageType.USER_LIST, username, null, null));
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out.flush();
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} else if (line.startsWith("/sendfile ")) {
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String[] parts = line.split(" ", 3);
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if (parts.length < 3) {
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System.out.println("Usage: /sendfile <user> <path>");
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continue;
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}
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String targetUser = parts[1];
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Path filePath = Paths.get(parts[2]);
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if (!Files.exists(filePath)) {
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System.out.println("File not found: " + filePath);
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continue;
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}
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long fileSize = Files.size(filePath);
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byte[] fileData = new byte[(int) fileSize];
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TransferProgress progress = new TransferProgress(fileSize);
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// Read file in chunks so the progress bar actually updates
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try (FileInputStream fis = new FileInputStream(filePath.toFile())) {
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int bytesRead = 0;
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byte[] buffer = new byte[8192];
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int chunk;
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while ((chunk = fis.read(buffer)) != -1) {
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System.arraycopy(buffer, 0, fileData, bytesRead, chunk);
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bytesRead += chunk;
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progress.update(bytesRead);
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}
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}
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String filename = filePath.getFileName().toString();
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out.writeObject(new FileMessage(username, targetUser, filename, fileData));
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out.flush();
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System.out.println("Sent '" + filename + "' to " + targetUser);
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} else {
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out.writeObject(new ChatMessage(MessageType.PUBLIC_MESSAGE, username, null, line));
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out.flush();
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}
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} catch (Exception e) {
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System.out.println("command failed: " + e.getMessage());
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}
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}
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} catch (Exception e) {
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System.out.println("Failed to connect to server: " + e.getMessage());
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}
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}
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}
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@@ -1,15 +1,25 @@
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package com.university.chat.Server;
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import java.io.IOException;
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import java.net.ServerSocket;
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import java.net.Socket;
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public class ChatServer {
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// TODO: declare a single shared UserManager instance (static final)
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// This MUST be shared by all ClientSession threads so that
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// broadcasting and private messaging work correctly.
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private static final int PORT = 12345;
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private static final UserManager userManager = new UserManager();
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public static void main(String[] args) {
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// TODO: Create a ServerSocket
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// TODO: In an infinite loop:
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// accept an incoming client connection
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// make a new thread running ClientSession for each user.
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System.out.println("Chat server started on port " + PORT);
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try (ServerSocket serverSocket = new ServerSocket(PORT)) {
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while (true) {
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Socket clientSocket = serverSocket.accept();
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System.out.println("New connection from " + clientSocket.getInetAddress());
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Thread thread = new Thread(new ClientSession(clientSocket, userManager));
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thread.start();
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}
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} catch (IOException e) {
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System.out.println("Server error: " + e.getMessage());
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}
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}
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}
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@@ -2,70 +2,124 @@ package com.university.chat.Server;
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import com.university.chat.Common.ChatMessage;
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import com.university.chat.Common.FileMessage;
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import com.university.chat.Common.MessageType;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.net.Socket;
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import java.nio.file.Files;
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public class ClientSession implements Runnable {
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private String username;
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private final Socket socket;
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private final UserManager userManager;
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private ObjectOutputStream out;
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private ObjectInputStream in;
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public ClientSession(Socket socket, UserManager userManager) {
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// TODO : Create an ObjectOutputStream from socket.getOutputStream()
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// and an ObjectInputStream from socket.getInputStream().
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this.socket = socket;
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this.userManager = userManager;
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try {
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// Output stream MUST come first on both ends to avoid handshake deadlock
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out = new ObjectOutputStream(socket.getOutputStream());
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out.flush();
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in = new ObjectInputStream(socket.getInputStream());
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} catch (IOException e) {
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System.out.println("Error setting up streams: " + e.getMessage());
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}
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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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// Login step
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Object firstObj = in.readObject();
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if (!(firstObj instanceof ChatMessage loginMsg) || loginMsg.getType() != MessageType.LOGIN) {
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socket.close();
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return;
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}
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// TODO: Welcome the user (login step)
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// 1. Read the first object sent by the client.
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// 2. Check it's a ChatMessage with type LOGIN.
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// 3. Extract the username.
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// 4. Try to register the user via userManager.addUser(...).
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// 5. If the username is taken, send back LOGIN_FAILED and close the socket.
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// 6. Otherwise, create the user's folders with FileManager.createUserFolders(...)
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// and send back LOGIN_SUCCESS.
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username = loginMsg.getSender();
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// TODO: Main message loop
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// In a loop, call in.readObject(), you can separate messages by their type:
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// - if it's a ChatMessage -> call handleChatMessage(msg)
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// - if it's a FileMessage -> call handleFileMessage(fileMsg)
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// Keep looping until the connection is closed (an exception will be thrown).
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if (!userManager.addUser(username, this)) {
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sendMessage(new ChatMessage(MessageType.LOGIN_FAILED, "Server", username, "Username already taken."));
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socket.close();
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return;
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}
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FileManager.createUserFolders(username);
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sendMessage(new ChatMessage(MessageType.LOGIN_SUCCESS, "Server", username, "Welcome, " + username + "!"));
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System.out.println(username + " logged in.");
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// Main message loop
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while (true) {
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Object obj = in.readObject();
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if (obj instanceof ChatMessage msg) {
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handleChatMessage(msg);
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} else if (obj instanceof FileMessage fileMsg) {
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handleFileMessage(fileMsg);
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}
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}
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} catch (Exception e) {
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System.out.println("Disconnected: " + username);
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} finally {
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// TODO: Remove the user from UserManager so they no longer
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// receive broadcasts or appear in users list
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if (username != null) {
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userManager.removeUser(username);
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}
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try {
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socket.close();
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} catch (IOException ignored) {}
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}
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}
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// synchronized so concurrent broadcast calls don't interleave bytes on the stream
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public synchronized void sendMessage(Object obj) throws IOException {
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out.writeObject(obj);
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out.flush();
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}
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private void handleChatMessage(ChatMessage msg) throws IOException {
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switch (msg.getType()) {
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case PUBLIC_MESSAGE -> {
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// TODO: Broadcast this message to every connected client.
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for (ClientSession session : userManager.getAllSessions()) {
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try {
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session.sendMessage(msg);
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} catch (IOException e) {
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System.out.println("Failed to deliver to " + session.username);
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}
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}
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}
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case PRIVATE_MESSAGE -> {
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// TODO: Forward this message to the receiver user.
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ClientSession receiver = userManager.getUser(msg.getReceiver());
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if (receiver != null) {
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receiver.sendMessage(msg);
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} else {
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sendMessage(new ChatMessage(MessageType.PUBLIC_MESSAGE, "Server", username,
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"User '" + msg.getReceiver() + "' is not online."));
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}
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}
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case USER_LIST -> {
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// TODO: Reply to the requester with the list of online users.
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sendMessage(new ChatMessage(MessageType.USER_LIST, "Server", username, userManager.listUsers()));
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}
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}
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}
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private void handleFileMessage(FileMessage fileMsg) throws IOException {
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// Storing the file
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var sentPath = FileManager.getSentPath(fileMsg.getSender(), fileMsg.getFilename());
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var recvPath = FileManager.getReceivedPath(fileMsg.getReceiver(), fileMsg.getFilename());
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Files.write(sentPath, fileMsg.getData());
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Files.write(recvPath, fileMsg.getData());
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// TODO: Forward the received file-message to the destination user.
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ClientSession receiver = userManager.getUser(fileMsg.getReceiver());
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if (receiver != null) {
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receiver.sendMessage(fileMsg);
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} else {
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sendMessage(new ChatMessage(MessageType.PUBLIC_MESSAGE, "Server", username,
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"User '" + fileMsg.getReceiver() + "' is not online; file was saved locally."));
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}
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}
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}
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}
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Reference in New Issue
Block a user