all classes implementd

src/main/java/com/university/chat/Client/ServerListener.java

@@ -1,10 +1,17 @@
 package com.university.chat.Client;
 
+import com.university.chat.Common.ChatMessage;
+import com.university.chat.Common.FileMessage;
+
+import java.io.ObjectInputStream;
+
 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)
 
+    private ObjectInputStream objectInputStream;
+
     @Override
     public void run() {
         try {
@@ -13,6 +20,16 @@ public class ServerListener implements Runnable{
             //   - if it's a FileMessage  -> print that a file was received
             //                               (filename + sender), it's already
             //                               saved to disk by the server.
+
+            while (true) {
+                if (objectInputStream.readObject() instanceof ChatMessage chatMessage) {
+                    System.out.println(chatMessage.getSender() + " : " + chatMessage.getContent());
+                }
+                if (objectInputStream.readObject() instanceof FileMessage fileMessage) {
+                    System.out.println(" a file received from " + fileMessage.getSender() + " : " + fileMessage.getFilename());
+                }
+            }
+
         } catch (Exception e){
             System.out.println("Disconnected from server");
         }

src/main/java/com/university/chat/Client/chatClient.java

@@ -1,7 +1,24 @@
 package com.university.chat.Client;
 
+import com.university.chat.Common.ChatMessage;
+import com.university.chat.Common.FileMessage;
+
+import java.io.*;
+import java.net.Socket;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Scanner;
+
+import static com.university.chat.Common.MessageType.*;
+
 public class chatClient {
-    public static void main() {
+
+    private static String username;
+    private static ObjectOutputStream objectOutputStream;
+    private static ObjectInputStream objectInputStream;
+
+    public static void main(String[] args) {
         // TODO: Connecting to the server
         //  1. Create a socket and connect to the server
         //  2. Create an ObjectOutputStream (out) and ObjectInputStream (in)
@@ -10,6 +27,41 @@ public class chatClient {
         //  3. Start a new Thread running a ServerListener(in) so incoming
         //      messages are handled concurrently.
 
+        try {
+            Socket socket = new Socket("localhost", 5000);
+            objectOutputStream = new ObjectOutputStream(socket.getOutputStream());
+            objectOutputStream.flush();
+            objectInputStream = new ObjectInputStream(socket.getInputStream());
+
+            Scanner scanner = new Scanner(System.in);
+            System.out.print("Enter your username: ");
+            username = scanner.nextLine().trim();
+
+            ChatMessage loginMsg = new ChatMessage(LOGIN, username, null, null);
+            objectOutputStream.writeObject(loginMsg);
+            objectOutputStream.flush();
+
+            Object response = objectInputStream.readObject();
+            if (response instanceof ChatMessage chatResponse) {
+                if (chatResponse.getType() == LOGIN_SUCCESS) {
+                    System.out.println("Login successful!");
+                } else if (chatResponse.getType() == LOGIN_FAILED) {
+                    System.out.println("Login failed: " + chatResponse.getContent());
+                    return;
+                }
+            }
+
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        }
+
+        ServerListener serverListener = new ServerListener();
+        Thread thread = new Thread(serverListener);
+        thread.setDaemon(true);
+        thread.start();
+
         while (true) {
             try {
                 // TODO: Program loop — read a line from the console and act on it:
@@ -21,6 +73,69 @@ public class chatClient {
                 //                                     and send it as a FileMessage
                 //   - anything else               -> send a PUBLIC_MESSAGE
                 //   Remember to flush() the output stream after writeObject().
+
+                Scanner scanner = new Scanner(System.in);
+                String input = scanner.nextLine();
+
+                if (input == null || input.trim().isEmpty()) {
+                    continue;
+                }
+
+                input = input.trim();
+
+                if (input.startsWith("/msg ")) {
+                    String[] parts = input.split(" ", 3);
+                    if (parts.length < 3) {
+                        System.out.println("Usage: /msg <user> <message>");
+                        continue;
+                    }
+                    String receiver = parts[1];
+                    String message = parts[2];
+
+                    ChatMessage privateMsg = new ChatMessage(PRIVATE_MESSAGE, username, receiver, message);
+                    objectOutputStream.writeObject(privateMsg);
+                    objectOutputStream.flush();
+                }
+                else if (input.equals("/users")) {
+                    ChatMessage userListRequest = new ChatMessage(USER_LIST, username, null, null);
+                    objectOutputStream.writeObject(userListRequest);
+                    objectOutputStream.flush();
+                }
+                else if (input.startsWith("/sendfile ")) {
+                    String[] parts = input.split(" ", 3);
+                    if (parts.length < 3) {
+                        System.out.println("Usage: /sendfile <user> <filepath>");
+                        continue;
+                    }
+
+                    String receiver = parts[1];
+                    String filePath = parts[2];
+
+                    Path path = Paths.get(filePath);
+                    if (!Files.exists(path)) {
+                        System.out.println("File not found: " + filePath);
+                        continue;
+                    }
+
+                    String filename = path.getFileName().toString();
+                    long fileSize = Files.size(path);
+
+                    System.out.println("Sending file: " + filename + " (" + fileSize + " bytes)");
+
+                    byte[] fileData = Files.readAllBytes(path);
+
+                    FileMessage fileMsg = new FileMessage(username, receiver, filename, fileData);
+                    objectOutputStream.writeObject(fileMsg);
+                    objectOutputStream.flush();
+
+                    System.out.println("File sent: " + filename);
+                }
+                else {
+                    ChatMessage publicMsg = new ChatMessage(PUBLIC_MESSAGE, username, "all", input);
+                    objectOutputStream.writeObject(publicMsg);
+                    objectOutputStream.flush();
+                }
+
             } catch (Exception e) {
                 System.out.println("command failed: " + e.getMessage());
             }

src/main/java/com/university/chat/Server/ChatServer.java

@@ -1,15 +1,27 @@
 package com.university.chat.Server;
 
+import java.io.IOException;
+import java.net.ServerSocket;
+
 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.
+    static final UserManager userManager = new UserManager();
 
     public static void main(String[] args) {
         // TODO: Create a ServerSocket
-
+        try (ServerSocket serverSocket = new ServerSocket(5000);) {
             // TODO: In an infinite loop:
             //  accept an incoming client connection
             //  make a new thread running ClientSession for each user.
+            while (true) {
+                ClientSession clientSession = new ClientSession(serverSocket.accept(), userManager);
+                Thread thread = new Thread(clientSession);
+                thread.start();
+            }
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
     }
 }

src/main/java/com/university/chat/Server/ClientSession.java

@@ -4,16 +4,34 @@ import com.university.chat.Common.ChatMessage;
 import com.university.chat.Common.FileMessage;
 
 import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
 import java.net.Socket;
 import java.nio.file.Files;
 
+import static com.university.chat.Common.MessageType.*;
+import static com.university.chat.Server.ChatServer.userManager;
+
 public class ClientSession implements Runnable {
 
     private String username;
+    private ObjectOutputStream objectOutputStream;
+    private ObjectInputStream objectInputStream;
+    private UserManager userManager;
+    private Socket socket;
 
     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 {
+            objectOutputStream = new ObjectOutputStream(socket.getOutputStream());
+            objectInputStream = new ObjectInputStream(socket.getInputStream());
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
     }
 
     @Override
@@ -29,17 +47,51 @@ public class ClientSession implements Runnable {
             //  6. Otherwise, create the user's folders with FileManager.createUserFolders(...)
             //      and send back LOGIN_SUCCESS.
 
+            Object object = objectInputStream.readObject();
+
+            if (object instanceof ChatMessage chatMessage) {
+                if (chatMessage.getType() == LOGIN) {
+                    username = chatMessage.getSender();
+                    if (userManager.addUser(username, this)) {
+                        FileManager.createUserFolders(username);
+                        ChatMessage successMsg = new ChatMessage(LOGIN_SUCCESS, "Server", username, "Welcome" + username);
+                        objectOutputStream.writeObject(successMsg);
+                        objectOutputStream.flush();
+                    } else {
+                        ChatMessage failedMsg = new ChatMessage(LOGIN_FAILED, "Server", username, "this username ia already taken!");
+                        objectOutputStream.writeObject(failedMsg);
+                        objectOutputStream.flush();
+                        socket.close();
+                        return;
+                    }
+                } else {
+                    ChatMessage failedMsg = new ChatMessage(LOGIN_FAILED, "Server", "anonymous", "LOGIN FIRST!");
+                }
+            } else {
+                socket.close();
+                return;
+            }
+
             // 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) {
+                if (objectInputStream.readObject() instanceof ChatMessage chatMessage1) {
+                    handleChatMessage(chatMessage1);
+                } else if (objectInputStream.readObject() instanceof FileMessage fileMessage) {
+                    handleFileMessage(fileMessage);
+                }
+            }
+
         } 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
+            userManager.removeUser(username);
         }
     }
 
@@ -48,12 +100,29 @@ public class ClientSession implements Runnable {
         switch (msg.getType()) {
             case PUBLIC_MESSAGE -> {
                 // TODO: Broadcast this message to every connected client.
+                for (ClientSession session : userManager.getAllSessions()) {
+                    session.objectOutputStream.writeObject(msg);
+                    session.objectOutputStream.flush();
+                }
             }
             case PRIVATE_MESSAGE -> {
                 // TODO: Forward this message to the receiver user.
+                String receiver = msg.getReceiver();
+                ClientSession receiverS = userManager.getUser(receiver);
+                if (receiverS != null) {
+                    receiverS.objectOutputStream.writeObject(msg);
+                    receiverS.objectOutputStream.flush();
+                } else {
+                    ChatMessage errorMsg = new ChatMessage(PUBLIC_MESSAGE, "Server", msg.getSender(), receiver + " is not online!");
+                    objectOutputStream.writeObject(errorMsg);
+                    objectOutputStream.flush();
+                }
             }
             case USER_LIST -> {
                 // TODO: Reply to the requester with the list of online users.
+                ChatMessage userListMsg = new ChatMessage(USER_LIST, "Server", msg.getSender(), userManager.listUsers());
+                objectOutputStream.writeObject(userListMsg);
+                objectOutputStream.flush();
             }
         }
     }
@@ -67,5 +136,21 @@ public class ClientSession implements Runnable {
         Files.write(recvPath, fileMsg.getData());
 
         // TODO: Forward the received file-message to the destination user.
+
+        String receiver = fileMsg.getReceiver();
+        ClientSession receiverSession = userManager.getUser(receiver);
+        if (receiverSession != null) {
+            try {
+                receiverSession.objectOutputStream.writeObject(fileMsg);
+                receiverSession.objectOutputStream.flush();
+            } catch (IOException e) {
+                System.out.println("Error sending file to " + receiver);
+            }
+        } else {
+            ChatMessage errorMsg = new ChatMessage(PUBLIC_MESSAGE, "Server", fileMsg.getSender(), receiver + " is not online!"
+            );
+            objectOutputStream.writeObject(errorMsg);
+            objectOutputStream.flush();
+        }
     }
 }