Arefe00/HW-10-Socket-Programming
1
0
Fork 0
forked from AdvancedProgramming1404/HW-10-Socket-Programming
Code Pull Requests Activity

HW10

Browse Source
This commit is contained in:
Arefe Talebi
2026-07-07 00:43:01 +03:30
parent 240eac0504
commit 55cd540fa0
4 changed files with 192 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/main/java/com/university/chat/Client/ServerListener.java
+18
View File
@@ -1,9 +1,19 @@
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() {
@@ -13,6 +23,14 @@ 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) {
Object obj = in.readObject();
if (obj instanceof ChatMessage msg) {
System.out.println(msg.getSender() + ": " + msg.getContent());
} else if (obj 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
+87 -2
View File
@@ -1,7 +1,18 @@
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.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Scanner;
public class chatClient {
public static void main() {
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)
@@ -9,6 +20,38 @@ public class chatClient {
// 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.
Scanner scanner = new Scanner(System.in);
String username;
ObjectOutputStream out;
ObjectInputStream in;
try {
Socket socket = new Socket("localhost", 12345);
out = new ObjectOutputStream(socket.getOutputStream());
in = new ObjectInputStream(socket.getInputStream());
System.out.print("Enter your username: ");
username = scanner.nextLine().trim();
out.writeObject(new ChatMessage(MessageType.LOGIN, username, null, null));
out.flush();
Object response = in.readObject();
if (response instanceof ChatMessage loginReply) {
System.out.println(loginReply.getContent());
if (loginReply.getType() == MessageType.LOGIN_FAILED) {
socket.close();
return;
}
}
new Thread(new ServerListener(in)).start();
} catch (Exception e) {
System.out.println("Could not connect to server: " + e.getMessage());
return;
}
while (true){
try {
@@ -21,9 +64,51 @@ public class chatClient {
// and send it as a FileMessage
// - anything else -> send a PUBLIC_MESSAGE
// Remember to flush() the output stream after writeObject().
String line = scanner.nextLine();
if (line.startsWith("/msg ")) {
String[] parts = line.substring(5).split(" ", 2);
if (parts.length < 2) {
System.out.println("Usage: /msg <username> <message>");
continue;
}
out.writeObject(new ChatMessage(MessageType.PRIVATE_MESSAGE, username, parts[0], parts[1]));
out.flush();
} else if (line.equals("/users")) {
out.writeObject(new ChatMessage(MessageType.USER_LIST, username, null, null));
out.flush();
} else if (line.startsWith("/sendfile ")) {
String[] parts = line.substring(10).split(" ", 2);
if (parts.length < 2) {
System.out.println("Usage: /sendfile <username> <filepath>");
continue;
}
String receiver = parts[0];
Path path = Path.of(parts[1]);
if (!Files.exists(path)) {
System.out.println("File not found: " + parts[1]);
continue;
}
byte[] data = Files.readAllBytes(path);
String filename = path.getFileName().toString();
TransferProgress progress = new TransferProgress(data.length);
progress.update(data.length);
out.writeObject(new FileMessage(username, receiver, filename, data));
out.flush();
} else {
out.writeObject(new ChatMessage(MessageType.PUBLIC_MESSAGE, username, null, line));
out.flush();
}
} catch (Exception e){
System.out.println("command failed: " + e.getMessage());
}
}
}
}
}
src/main/java/com/university/chat/Server/ChatServer.java
+18 -4
View File
@@ -1,15 +1,29 @@
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.
private static final UserManager userManager = new UserManager();
public static void main(String[] args) {
// TODO: Create a ServerSocket
try (ServerSocket serverSocket = new ServerSocket(12345)) {
// TODO: In an infinite loop:
// accept an incoming client connection
// make a new thread running ClientSession for each user.
// TODO: In an infinite loop:
// accept an incoming client connection
// make a new thread running ClientSession for each user.
while (true) {
Socket clientSocket = serverSocket.accept();
ClientSession session = new ClientSession(clientSocket, userManager);
new Thread(session).start();
}
} catch (IOException e) {
System.out.println("Server error: " + e.getMessage());
}
}
}
}
src/main/java/com/university/chat/Server/ClientSession.java
+69
View File
@@ -2,18 +2,34 @@ 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.in = new ObjectInputStream(socket.getInputStream());
} catch (IOException e) {
System.out.println("Failed to open streams: " + e.getMessage());
}
}
@Override
@@ -28,32 +44,81 @@ public class ClientSession implements Runnable {
// 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.
Object first = in.readObject();
if (!(first instanceof ChatMessage loginMsg) || loginMsg.getType() != MessageType.LOGIN) {
sendMessage(new ChatMessage(MessageType.LOGIN_FAILED, "server", null, "Expected LOGIN message"));
socket.close();
return;
}
username = loginMsg.getSender();
if (!userManager.addUser(username, this)) {
sendMessage(new ChatMessage(MessageType.LOGIN_FAILED, "server", username, "Username already taken"));
socket.close();
return;
}
FileManager.createUserFolders(username);
sendMessage(new ChatMessage(MessageType.LOGIN_SUCCESS, "server", username, "Welcome, " + username + "!"));
// 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 obj = in.readObject();
if (obj instanceof ChatMessage msg) {
handleChatMessage(msg);
} else if (obj 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);
}
try {
socket.close();
} catch (IOException ignored) {
}
}
}
public synchronized void sendMessage(Object obj) throws IOException {
out.writeObject(obj);
out.flush();
}
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 receiver = userManager.getUser(msg.getReceiver());
if (receiver != null) {
receiver.sendMessage(msg);
} else {
sendMessage(new ChatMessage(MessageType.PRIVATE_MESSAGE, "server", username,
"User '" + msg.getReceiver() + "' is not online."));
}
}
case USER_LIST -> {
// TODO: Reply to the requester with the list of online users.
sendMessage(new ChatMessage(MessageType.USER_LIST, "server", username, userManager.listUsers()));
}
default -> {
}
}
}
@@ -67,5 +132,9 @@ public class ClientSession implements Runnable {
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.sendMessage(fileMsg);
}
}
}