Complete network chat system with file sharing

2026-06-28 20:53:23 +03:30
parent 240eac0504
commit 33a49821fc
4 changed files with 266 additions and 57 deletions
@@ -1,29 +1,112 @@
 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){
+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;
+
+public class chatClient {
+
+    private static ObjectOutputStream out;
+    private static ObjectInputStream in;
+    private static String username;
+
+
+    public static void main(String[] args) {
+        try {
+
+            Socket socket = new Socket("localhost", 12345);
+
+            out = new ObjectOutputStream(socket.getOutputStream());
+            in = new ObjectInputStream(socket.getInputStream());
+
+            Scanner scanner = new Scanner(System.in);
+            System.out.print("Enter your username: ");
+            username = scanner.nextLine().trim();
+
+            ChatMessage loginMsg = new ChatMessage(MessageType.LOGIN, username, null, "");
+            out.writeObject(loginMsg);
+            out.flush();
+
+
+            ServerListener listener = new ServerListener(in);
+            new Thread(listener).start();
+            while (true){
+                try {
+                    System.out.print("> ");
+                    String line = scanner.nextLine();
+                    if (line == null) break;
+
+                    if (line.equals("/exit") || line.equals("/quit")) {
+                        System.out.println("Disconnecting...");
+                        break;
+                    }
+
+                    if (line.startsWith("/msg ")) {
+                        String[] parts = line.split(" ", 3);
+                        if (parts.length < 3) {
+                            System.out.println("Usage: /msg <username> <message>");
+                            continue;
+                        }
+                        String target = parts[1];
+                        String content = parts[2];
+                        ChatMessage privateMsg = new ChatMessage(MessageType.PRIVATE_MESSAGE,
+                                username, target, content);
+                        out.writeObject(privateMsg);
+                        out.flush();
+                    } else if (line.equals("/users")) {
+                        ChatMessage userListReq = new ChatMessage(MessageType.USER_LIST,
+                                username, null, "");
+                        out.writeObject(userListReq);
+                        out.flush();
+                    } else if (line.startsWith("/sendfile ")) {
+                        String[] parts = line.split(" ", 3);
+                        if (parts.length < 3) {
+                            System.out.println("Usage: /sendfile <username> <filepath>");
+                            continue;
+                        }
+                        String target = parts[1];
+                        String filePath = parts[2];
+
+                        Path path = Paths.get(filePath);
+                        if (!Files.exists(path) || Files.isDirectory(path)) {
+                            System.out.println("File does not exist or is a directory.");
+                            continue;
+                        }
+
+                        byte[] data = Files.readAllBytes(path);
+                        String filename = path.getFileName().toString();
+
+                        TransferProgress progress = new TransferProgress(data.length);
+                        progress.update(data.length);
+
+                        FileMessage fileMsg = new FileMessage(username, target, filename, data);
+                        out.writeObject(fileMsg);
+                        out.flush();
+                        System.out.println("File sent to " + target);
+                    } else {
+                        ChatMessage publicMsg = new ChatMessage(MessageType.PUBLIC_MESSAGE,
+                                username, null, line);
+                        out.writeObject(publicMsg);
+                        out.flush();
+                    }
+                }catch (IOException e) {
+                    System.out.println("Connection lost. Exiting...");
+                    break;
+                } catch (Exception e){
                System.out.println("command failed: " + e.getMessage());
            }
        }
+            socket.close();
+            scanner.close();
+        } catch (Exception e) {
+            System.out.println("Connection error: " + e.getMessage());
+        }
    }
 }