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Assignment-10

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Soroush
2026-06-27 19:03:05 +03:30
parent 240eac0504
commit 38e0efa807
4 changed files with 229 additions and 56 deletions
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src/main/java/com/university/chat/Client/ServerListener.java
+22 -8
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@@ -1,18 +1,32 @@
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 final 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 "<sender>: <content>"
// - if it's a FileMessage -> print that a file was received
// (filename + sender), it's already
// saved to disk by the server.
while (true) {
Object receivedObject = in.readObject();
if (receivedObject instanceof ChatMessage) {
ChatMessage chatMsg = (ChatMessage) receivedObject;
System.out.println(chatMsg.getSender() + ": " + chatMsg.getContent());
} else if (receivedObject instanceof FileMessage) {
FileMessage fileMsg = (FileMessage) receivedObject;
System.out.println("[System] File received: " + fileMsg.getFilename() +
" sent by " + fileMsg.getSender() + ".");
}
}
} catch (Exception e){
System.out.println("Disconnected from server");
}
src/main/java/com/university/chat/Client/chatClient.java
+100 -17
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@@ -1,26 +1,109 @@
package com.university.chat.Client;
import com.university.chat.Common.ChatMessage;
import com.university.chat.Common.FileMessage;
import com.university.chat.Common.MessageType;
import java.io.*;
import java.net.Socket;
import java.util.Scanner;
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.
private static final String SERVER_HOST = "127.0.0.1";
private static final int SERVER_PORT = 5000;
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
Socket socket;
ObjectOutputStream out;
ObjectInputStream in;
String username;
try {
System.out.println("Connecting to server at " + SERVER_HOST + ":" + SERVER_PORT + "...");
socket = new Socket(SERVER_HOST, SERVER_PORT);
out = new ObjectOutputStream(socket.getOutputStream());
out.flush();
in = new ObjectInputStream(socket.getInputStream());
System.out.print("Enter your username: ");
username = scanner.nextLine().trim();
ChatMessage loginMsg = new ChatMessage(MessageType.LOGIN, username, "SERVER", "");
out.writeObject(loginMsg);
out.flush();
ServerListener listener = new ServerListener(in);
Thread listenerThread = new Thread(listener);
listenerThread.setDaemon(true);
listenerThread.start();
System.out.println("Logged in successfully! You can now type your message.");
} catch (IOException e) {
System.err.println("Could not connect to server: " + e.getMessage());
return;
}
while (true){
try {
// TODO: Program loop — read a line from the console and act on it:
// - "/msg <user> <text>" -> build & send a PRIVATE_MESSAGE
// - "/users" -> build & send a USER_LIST request
// - "/sendfile <user> <path>" -> 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().
String line = scanner.nextLine().trim();
if (line.isEmpty()) continue;
if (line.startsWith("/msg")) {
String[] parts = line.split(" ", 3);
if (parts.length < 3) {
System.out.println("Usage: /msg <username> <message>");
continue;
}
String receiver = parts[1];
String message = parts[2];
ChatMessage privateMsg = new ChatMessage(MessageType.PRIVATE_MESSAGE, username, receiver, message);
out.writeObject(privateMsg);
System.out.println("[To " + receiver + "]: " + message);
} else if (line.trim().equals("/users")) {
ChatMessage listMsg = new ChatMessage(MessageType.USER_LIST, username, "SERVER", "");
out.writeObject(listMsg);
} else if (line.startsWith("/sendfile")) {
String[] parts = line.split(" ", 3);
if (parts.length < 3) {
System.out.println("Usage: /sendfile <username> <filepath>");
continue;
}
String receiver = parts[1];
String filePath = parts[2];
File file = new File(filePath);
if (!file.exists()) {
System.out.println("File does not exist: " + filePath);
continue;
}
long fileSize = file.length();
byte[] fileData = new byte[(int) fileSize];
try (FileInputStream fis = new FileInputStream(file)) {
fis.read(fileData);
}
TransferProgress progress = new TransferProgress(fileSize);
progress.update(fileSize);
FileMessage fileMsg = new FileMessage(username, receiver, file.getName(), fileData);
out.writeObject(fileMsg);
System.out.println(file.getName() + " Sent successfully.");
} else {
ChatMessage publicMsg = new ChatMessage(MessageType.PUBLIC_MESSAGE, username, "ALL", line);
out.writeObject(publicMsg);
}
out.flush();
} catch (Exception e){
System.out.println("command failed: " + e.getMessage());
}
src/main/java/com/university/chat/Server/ChatServer.java
+26 -7
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@@ -1,15 +1,34 @@
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)
// This MUST be shared by all ClientSession threads so that
// broadcasting and private messaging work correctly.
public static final UserManager userManager = new UserManager();
private static final int PORT = 5000;
public static void main(String[] args) {
// TODO: Create a ServerSocket
System.out.println("Initializing Chat Server on port " + PORT + "...");
// TODO: In an infinite loop:
// accept an incoming client connection
// make a new thread running ClientSession for each user.
try (ServerSocket serverSocket = new ServerSocket(PORT)) {
System.out.println("Server successfully connected to port. Waiting for clients...");
while (true) {
try {
Socket clientSocket = serverSocket.accept();
System.out.println("Connection established with: " + clientSocket.getRemoteSocketAddress());
ClientSession clientSession = new ClientSession(clientSocket, userManager);
Thread sessionThread = new Thread(clientSession);
sessionThread.start();
} catch (IOException e) {
System.err.println("Failed to accept a specific client connection: " + e.getMessage());
}
}
} catch (IOException e) {
System.err.println("Critical Server Error: Could not listen on port " + PORT);
System.err.println(e.getMessage());
}
}
}
src/main/java/com/university/chat/Server/ClientSession.java
+81 -24
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@@ -2,70 +2,127 @@ 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 final Socket socket;
private final UserManager userManager;
private ObjectOutputStream out;
private ObjectInputStream in;
private String username;
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) {
System.err.println("Error initializing streams for session: " + e.getMessage());
}
}
@Override
public void run() {
try {
Object firstObject = in.readObject();
// 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.
if (firstObject instanceof ChatMessage loginMsg && loginMsg.getType() == MessageType.LOGIN) {
this.username = loginMsg.getSender();
// 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).
if (userManager.addUser(username, this)) {
FileManager.createUserFolders(username);
sendMessage(new ChatMessage(MessageType.LOGIN_SUCCESS, "SERVER", username, "Login successful."));
System.out.println("[Server] User logged in: " + username);
} else {
sendMessage(new ChatMessage(MessageType.LOGIN_FAILED, "SERVER", username, "Username is already taken."));
socket.close();
return;
}
} else {
socket.close();
return;
}
while (true) {
Object receivedObject = in.readObject();
if (receivedObject instanceof ChatMessage) {
handleChatMessage((ChatMessage) receivedObject);
} else if (receivedObject instanceof FileMessage) {
handleFileMessage((FileMessage) receivedObject);
}
}
} 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) {
if (userManager.getUser(username) == this) {
userManager.removeUser(username);
System.out.println("[Server] Safely removed active user: " + username);
}
}
try {
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()) {
session.sendMessage(msg);
}
}
case PRIVATE_MESSAGE -> {
// TODO: Forward this message to the receiver user.
ClientSession recipient = userManager.getUser(msg.getReceiver());
if (recipient != null) {
recipient.sendMessage(msg);
} else {
sendMessage(new ChatMessage(MessageType.PUBLIC_MESSAGE, "SERVER", username, "User " + msg.getReceiver() + " is offline."));
}
}
case USER_LIST -> {
// TODO: Reply to the requester with the list of online users.
String activeUsers = userManager.listUsers();
ChatMessage listMsg = new ChatMessage(MessageType.USER_LIST, "SERVER", username, activeUsers);
sendMessage(listMsg);
}
default -> System.out.println("Unknown ChatMessage type received.");
}
}
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 recipient = userManager.getUser(fileMsg.getReceiver());
if (recipient != null) {
recipient.sendMessage(fileMsg);
}
}
public synchronized void sendMessage(Object msg) {
try {
if (out != null) {
out.writeObject(msg);
out.flush();
}
} catch (IOException e) {
System.err.println("Failed to send packet to " + username + ": " + e.getMessage());
}
}
}