implemet Server Listener + chat server + part of client session

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

@@ -1,9 +1,14 @@
 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{
+    private ObjectInputStream in ;
     public ServerListener(ObjectInputStream in) {
+        this.in = in ;
     }
     // TODO: store the ObjectInputStream from the user socket
     //          (this should be the same input stream the
@@ -12,6 +17,18 @@ public class ServerListener implements Runnable{
     @Override
     public void run() {
         try {
+                Object obj =in.readObject() ;
+                if (obj instanceof ChatMessage)
+                {
+                    ChatMessage msg = (ChatMessage) obj ;
+                    System.out.println("from : " + msg.getSender() + " ->" +msg.getContent() );
+                }
+                else if(obj instanceof FileMessage)
+                {
+                    FileMessage fmsg = (FileMessage) obj ;
+                    System.out.println("from : " + fmsg.getSender() + "-> File Name : " + fmsg.getFilename());
+
+                }
             // TODO: In an infinite loop read objects from the server
             //   - if it's a ChatMessage  -> print "<sender>: <content>"
             //   - if it's a FileMessage  -> print that a file was received

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

@@ -1,12 +1,25 @@
 package com.university.chat.Server;
 
+import java.io.IOException;
+import java.net.ServerSocket;
+import java.net.Socket;
+
 public class ChatServer {
     // TODO: declare a single shared UserManager instance (static final)
+    private static final UserManager usermanager = new UserManager() ;
     //         This MUST be shared by all ClientSession threads so that
     //         broadcasting and private messaging work correctly.
 
-    public static void main(String[] args) {
+    public static void main(String[] args) throws IOException {
         // TODO: Create a ServerSocket
+        ServerSocket serverSocket = new ServerSocket(8080) ;
+        while (true)
+        {
+            Socket socket = serverSocket.accept() ;
+            ClientSession clientSession = new ClientSession(socket , usermanager) ;
+            Thread thread = new Thread(clientSession) ;
+            thread.start();
+        }
 
         // TODO: In an infinite loop:
         //  accept an incoming client connection

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

@@ -2,23 +2,51 @@ 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 ObjectInputStream in;
+    private ObjectOutputStream out ;
+    private Socket socket ;
+    private UserManager userManager ;
 
-    public ClientSession(Socket socket, UserManager userManager) {
+    public ClientSession(Socket socket, UserManager userManager) throws IOException {
         // TODO : Create an ObjectOutputStream from socket.getOutputStream()
         //         and an ObjectInputStream from socket.getInputStream().
+        this.socket = socket ;
+        this.userManager = userManager ;
+        this.out = new ObjectOutputStream(socket.getOutputStream()) ;
+        out.flush();
+        this.in = new ObjectInputStream(socket.getInputStream()) ;
+
+
+
     }
 
     @Override
     public void run() {
         try {
+            Object obj = in.readObject() ;
+            if (obj instanceof ChatMessage loginmsg && loginmsg.getType() == MessageType.LOGIN)
+            {
+                this.username = loginmsg.getSender() ;
+                if (userManager.addUser(username , this))
+                {
+                    FileManager.createUserFolders(username);
+                    out.writeObject(new ChatMessage(MessageType.LOGIN_SUCCESS, "SERVER", username, "Welcome " + username));
+                    out.flush();
+                     System.out.println("User logged in successfully: " + username);
+
+                }
+            }
 
             // TODO: Welcome the user (login step)
             //  1. Read the first object sent by the client.