From 564cfd069fc0c17d82237e45fc0591858e65a0a7 Mon Sep 17 00:00:00 2001 From: kasra Date: Mon, 22 Jun 2026 19:54:05 +0330 Subject: [PATCH] HW10 --- .../chat/Client/ServerListener.java | 35 ++++--- .../university/chat/Client/chatClient.java | 89 ++++++++++++----- .../university/chat/Server/ChatServer.java | 25 +++-- .../university/chat/Server/ClientSession.java | 99 ++++++++++++++----- 4 files changed, 181 insertions(+), 67 deletions(-) diff --git a/src/main/java/com/university/chat/Client/ServerListener.java b/src/main/java/com/university/chat/Client/ServerListener.java index b609d74..85f2101 100644 --- a/src/main/java/com/university/chat/Client/ServerListener.java +++ b/src/main/java/com/university/chat/Client/ServerListener.java @@ -1,20 +1,33 @@ package com.university.chat.Client; -public class ServerListener implements Runnable{ - // TODO: store the ObjectInputStream from the user socket - // (this should be the same input stream the - // chatClient created when connecting) +import com.university.chat.Common.ChatMessage; +import com.university.chat.Common.FileMessage; + +import java.io.ObjectInputStream; + +public class ServerListener implements Runnable { + + private ObjectInputStream in; + + public ServerListener(ObjectInputStream in) { + this.in = in; + } @Override public void run() { try { - // TODO: In an infinite loop read objects from the server - // - if it's a ChatMessage -> print ": " - // - if it's a FileMessage -> print that a file was received - // (filename + sender), it's already - // saved to disk by the server. - } catch (Exception e){ + while (true) { + Object obj = in.readObject(); + if (obj instanceof ChatMessage) { + ChatMessage msg = (ChatMessage) obj; + System.out.println(msg.getSender() + ": " + msg.getContent()); + } else if (obj instanceof FileMessage) { + FileMessage fileMsg = (FileMessage) obj; + System.out.println("File received: " + fileMsg.getFilename() + " from " + fileMsg.getSender()); + } + } + } catch (Exception e) { System.out.println("Disconnected from server"); } } -} +} \ No newline at end of file diff --git a/src/main/java/com/university/chat/Client/chatClient.java b/src/main/java/com/university/chat/Client/chatClient.java index dae0bad..4dc3d51 100644 --- a/src/main/java/com/university/chat/Client/chatClient.java +++ b/src/main/java/com/university/chat/Client/chatClient.java @@ -1,29 +1,72 @@ package com.university.chat.Client; -public class chatClient { - public static void main() { - // TODO: Connecting to the server - // 1. Create a socket and connect to the server - // 2. Create an ObjectOutputStream (out) and ObjectInputStream (in) - // from the socket's streams — output FIRST, then input. - // 2. Get the username, and send a LOGIN ChatMessage with that username - // 3. Start a new Thread running a ServerListener(in) so incoming - // messages are handled concurrently. +import com.university.chat.Common.ChatMessage; +import com.university.chat.Common.FileMessage; +import com.university.chat.Common.MessageType; - while (true){ - try { - // TODO: Program loop — read a line from the console and act on it: - // - "/msg " -> build & send a PRIVATE_MESSAGE - // - "/users" -> build & send a USER_LIST request - // - "/sendfile " -> read the file into a byte[] - // (you can use TransferProgress - // to show progress) - // and send it as a FileMessage - // - anything else -> send a PUBLIC_MESSAGE - // Remember to flush() the output stream after writeObject(). - } catch (Exception e){ - System.out.println("command failed: " + e.getMessage()); +import java.io.File; +import java.io.ObjectInputStream; +import java.io.ObjectOutputStream; +import java.net.Socket; +import java.nio.file.Files; +import java.util.Scanner; + +public class chatClient { + public static void main(String[] args) { + try { + Scanner scanner = new Scanner(System.in); + Socket socket = new Socket("localhost", 8080); + + ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream()); + out.flush(); + ObjectInputStream in = new ObjectInputStream(socket.getInputStream()); + + System.out.print("Enter your username: "); + String username = scanner.nextLine(); + + out.writeObject(new ChatMessage(MessageType.LOGIN, username, "Server", "")); + out.flush(); + + Thread listenerThread = new Thread(new ServerListener(in)); + listenerThread.start(); + + while (true) { + String input = scanner.nextLine(); + if (input.startsWith("/msg ")) { + String[] parts = input.split(" ", 3); + if (parts.length == 3) { + out.writeObject(new ChatMessage(MessageType.PRIVATE_MESSAGE, username, parts[1], parts[2])); + out.flush(); + } + } else if (input.equals("/users")) { + out.writeObject(new ChatMessage(MessageType.USER_LIST, username, "Server", "")); + out.flush(); + } else if (input.startsWith("/sendfile ")) { + String[] parts = input.split(" ", 3); + if (parts.length == 3) { + String receiver = parts[1]; + String filepath = parts[2]; + File file = new File(filepath); + + if (file.exists() && file.isFile()) { + byte[] fileData = Files.readAllBytes(file.toPath()); + + TransferProgress progress = new TransferProgress(fileData.length); + progress.update(fileData.length); + + out.writeObject(new FileMessage(username, receiver, file.getName(), fileData)); + out.flush(); + } else { + System.out.println("File not found or invalid path."); + } + } + } else { + out.writeObject(new ChatMessage(MessageType.PUBLIC_MESSAGE, username, "All", input)); + out.flush(); + } } + } catch (Exception e) { + System.out.println("command failed: " + e.getMessage()); } } -} +} \ No newline at end of file diff --git a/src/main/java/com/university/chat/Server/ChatServer.java b/src/main/java/com/university/chat/Server/ChatServer.java index b2a35ae..0128b52 100644 --- a/src/main/java/com/university/chat/Server/ChatServer.java +++ b/src/main/java/com/university/chat/Server/ChatServer.java @@ -1,15 +1,22 @@ package com.university.chat.Server; +import java.net.ServerSocket; +import java.net.Socket; + public class ChatServer { - // TODO: declare a single shared UserManager instance (static final) - // This MUST be shared by all ClientSession threads so that - // broadcasting and private messaging work correctly. + + private static final UserManager userManager = new UserManager(); public static void main(String[] args) { - // TODO: Create a ServerSocket - - // TODO: In an infinite loop: - // accept an incoming client connection - // make a new thread running ClientSession for each user. + try (ServerSocket serverSocket = new ServerSocket(8080)) { + System.out.println("Server started on port 8080"); + while (true) { + Socket clientSocket = serverSocket.accept(); + ClientSession session = new ClientSession(clientSocket, userManager); + new Thread(session).start(); + } + } catch (Exception e) { + e.printStackTrace(); + } } -} +} \ No newline at end of file diff --git a/src/main/java/com/university/chat/Server/ClientSession.java b/src/main/java/com/university/chat/Server/ClientSession.java index f09d64a..c62f968 100644 --- a/src/main/java/com/university/chat/Server/ClientSession.java +++ b/src/main/java/com/university/chat/Server/ClientSession.java @@ -2,70 +2,121 @@ package com.university.chat.Server; import com.university.chat.Common.ChatMessage; import com.university.chat.Common.FileMessage; +import com.university.chat.Common.MessageType; import java.io.IOException; +import java.io.ObjectInputStream; +import java.io.ObjectOutputStream; import java.net.Socket; import java.nio.file.Files; public class ClientSession implements Runnable { private String username; + private Socket socket; + private UserManager userManager; + private ObjectOutputStream out; + private ObjectInputStream in; public ClientSession(Socket socket, UserManager userManager) { - // TODO : Create an ObjectOutputStream from socket.getOutputStream() - // and an ObjectInputStream from socket.getInputStream(). + this.socket = socket; + this.userManager = userManager; + try { + this.out = new ObjectOutputStream(socket.getOutputStream()); + this.out.flush(); + this.in = new ObjectInputStream(socket.getInputStream()); + } catch (IOException e) { + e.printStackTrace(); + } } @Override public void run() { try { + Object firstObject = in.readObject(); + if (firstObject instanceof ChatMessage) { + ChatMessage loginMsg = (ChatMessage) firstObject; + if (loginMsg.getType() == MessageType.LOGIN) { + this.username = loginMsg.getSender(); + if (!userManager.addUser(this.username, this)) { + out.writeObject(new ChatMessage(MessageType.LOGIN_FAILED, "Server", this.username, "Username already taken")); + out.flush(); + socket.close(); + return; + } + FileManager.createUserFolders(this.username); + out.writeObject(new ChatMessage(MessageType.LOGIN_SUCCESS, "Server", this.username, "Login successful")); + out.flush(); + } + } - // TODO: Welcome the user (login step) - // 1. Read the first object sent by the client. - // 2. Check it's a ChatMessage with type LOGIN. - // 3. Extract the username. - // 4. Try to register the user via userManager.addUser(...). - // 5. If the username is taken, send back LOGIN_FAILED and close the socket. - // 6. Otherwise, create the user's folders with FileManager.createUserFolders(...) - // and send back LOGIN_SUCCESS. - - // TODO: Main message loop - // In a loop, call in.readObject(), you can separate messages by their type: - // - if it's a ChatMessage -> call handleChatMessage(msg) - // - if it's a FileMessage -> call handleFileMessage(fileMsg) - // Keep looping until the connection is closed (an exception will be thrown). + while (true) { + Object msg = in.readObject(); + if (msg instanceof ChatMessage) { + handleChatMessage((ChatMessage) msg); + } else if (msg instanceof FileMessage) { + handleFileMessage((FileMessage) msg); + } + } } catch (Exception e) { System.out.println("Disconnected: " + username); } finally { - // TODO: Remove the user from UserManager so they no longer - // receive broadcasts or appear in users list + if (username != null) { + userManager.removeUser(username); + } + try { + if (socket != null && !socket.isClosed()) { + socket.close(); + } + } catch (IOException e) { + e.printStackTrace(); + } } } - private void handleChatMessage(ChatMessage msg) throws IOException { switch (msg.getType()) { case PUBLIC_MESSAGE -> { - // TODO: Broadcast this message to every connected client. + for (ClientSession session : userManager.getAllSessions()) { + if (!session.username.equals(this.username)) { + session.sendMessage(msg); + } + } } case PRIVATE_MESSAGE -> { - // TODO: Forward this message to the receiver user. + ClientSession receiverSession = userManager.getUser(msg.getReceiver()); + if (receiverSession != null) { + receiverSession.sendMessage(msg); + } } case USER_LIST -> { - // TODO: Reply to the requester with the list of online users. + String users = userManager.listUsers(); + sendMessage(new ChatMessage(MessageType.USER_LIST, "Server", this.username, users)); } } } private void handleFileMessage(FileMessage fileMsg) throws IOException { - // Storing the file var sentPath = FileManager.getSentPath(fileMsg.getSender(), fileMsg.getFilename()); var recvPath = FileManager.getReceivedPath(fileMsg.getReceiver(), fileMsg.getFilename()); Files.write(sentPath, fileMsg.getData()); Files.write(recvPath, fileMsg.getData()); - // TODO: Forward the received file-message to the destination user. + ClientSession receiverSession = userManager.getUser(fileMsg.getReceiver()); + if (receiverSession != null) { + receiverSession.sendFile(fileMsg); + } + } + + public void sendMessage(ChatMessage msg) throws IOException { + out.writeObject(msg); + out.flush(); + } + + public void sendFile(FileMessage fileMsg) throws IOException { + out.writeObject(fileMsg); + out.flush(); } } \ No newline at end of file