Parmis_jamami/HW-10-Socket-Programming
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Merge pull request 'Develop' (#1) from develop into main

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This commit was merged in pull request #1.
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Aeen
2026-07-30 10:17:51 +00:00
parent 240eac0504 2d9883e684
commit b6e6e69270
4 changed files with 263 additions and 67 deletions
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src/main/java/com/university/chat/Client/ServerListener.java
+31 -11
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@@ -1,20 +1,40 @@
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 "<sender>: <content>"
// - 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 object = in.readObject();
if (object instanceof ChatMessage msg) {
System.out.println(msg.getSender() + ": " + msg.getContent());
}
if (object instanceof FileMessage fileMsg) {
System.out.println(
"File received: " +
fileMsg.getFilename() +
" from " +
fileMsg.getSender()
);
}
}
} catch (Exception e) {
System.out.println("Disconnected from server");
}
}
}
}
src/main/java/com/university/chat/Client/chatClient.java
+100 -23
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@@ -1,29 +1,106 @@
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 <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().
} 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 {
Socket socket = new Socket("localhost", 5000);
ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream());
ObjectInputStream in = new ObjectInputStream(socket.getInputStream());
Scanner scanner = new Scanner(System.in);
System.out.print("Enter username: ");
String username = scanner.nextLine();
ChatMessage loginMessage = new ChatMessage(
MessageType.LOGIN,
username,
null,
""
);
out.writeObject(loginMessage);
out.flush();
new Thread(new ServerListener(in)).start();
while (true) {
try {
String line = scanner.nextLine();
if (line.startsWith("/msg ")) {
String[] parts = line.split(" ", 3);
ChatMessage privateMessage = new ChatMessage(
MessageType.PRIVATE_MESSAGE,
username,
parts[1],
parts[2]
);
out.writeObject(privateMessage);
}
else if (line.equals("/users")) {
ChatMessage userListMessage = new ChatMessage(
MessageType.USER_LIST,
username,
null,
""
);
out.writeObject(userListMessage);
}
else if (line.startsWith("/sendfile ")) {
String[] parts = line.split(" ", 3);
File file = new File(parts[2]);
byte[] data = Files.readAllBytes(file.toPath());
FileMessage fileMessage = new FileMessage(
username,
parts[1],
file.getName(),
data
);
out.writeObject(fileMessage);
}
else {
ChatMessage publicMessage = new ChatMessage(
MessageType.PUBLIC_MESSAGE,
username,
null,
line
);
out.writeObject(publicMessage);
}
out.flush();
} catch (Exception e) {
System.out.println("command failed: " + e.getMessage());
}
}
} catch (Exception e) {
System.out.println("Could not connect to server");
}
}
}
}
src/main/java/com/university/chat/Server/ChatServer.java
+17 -8
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@@ -1,15 +1,24 @@
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
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) {
Socket socket = serverSocket.accept();
ClientSession session = new ClientSession(socket, userManager);
new Thread(session).start();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
src/main/java/com/university/chat/Server/ClientSession.java
+115 -25
View File
@@ -2,70 +2,160 @@ 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 ObjectInputStream in;
private ObjectOutputStream out;
public ClientSession(Socket socket, UserManager userManager) {
// TODO : Create an ObjectOutputStream from socket.getOutputStream()
// and an ObjectInputStream from socket.getInputStream().
try {
this.socket = socket;
this.userManager = userManager;
out = new ObjectOutputStream(socket.getOutputStream());
in = new ObjectInputStream(socket.getInputStream());
} catch (IOException e) {
e.printStackTrace();
}
}
@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 loginMessage)) {
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).
if (loginMessage.getType() != MessageType.LOGIN) {
socket.close();
return;
}
username = loginMessage.getSender();
boolean added = userManager.addUser(username, this);
if (!added) {
ChatMessage failedMessage = new ChatMessage(
MessageType.LOGIN_FAILED,
"SERVER",
username,
"Username already exists"
);
send(failedMessage);
socket.close();
return;
}
FileManager.createUserFolders(username);
ChatMessage successMessage = new ChatMessage(
MessageType.LOGIN_SUCCESS,
"SERVER",
username,
"Login successful"
);
send(successMessage);
while (true) {
Object object = in.readObject();
if (object instanceof ChatMessage msg) {
handleChatMessage(msg);
}
if (object instanceof FileMessage fileMsg) {
handleFileMessage(fileMsg);
}
}
} 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);
}
}
}
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.send(msg);
}
}
case PRIVATE_MESSAGE -> {
// TODO: Forward this message to the receiver user.
ClientSession receiver = userManager.getUser(msg.getReceiver());
if (receiver != null) {
receiver.send(msg);
}
}
case USER_LIST -> {
// TODO: Reply to the requester with the list of online users.
ChatMessage userListMessage = new ChatMessage(
MessageType.USER_LIST,
"SERVER",
username,
userManager.listUsers()
);
send(userListMessage);
}
default -> {
}
}
}
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());
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 receiver = userManager.getUser(fileMsg.getReceiver());
if (receiver != null) {
receiver.send(fileMsg);
}
}
public void send(ChatMessage msg) throws IOException {
out.writeObject(msg);
out.flush();
}
public void send(FileMessage msg) throws IOException {
out.writeObject(msg);
out.flush();
}
}