Created
February 21, 2018 08:14
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Simple chat server in Java.
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import java.io.*; | |
import java.net.*; | |
import java.util.*; | |
public class Chat implements Runnable { | |
private static ArrayList<Chat> users = new ArrayList<>(); | |
private Socket socket; | |
private PrintStream writer; | |
private String name; | |
public Chat(Socket socket) { | |
this.socket = socket; | |
} | |
public void run() { | |
try { | |
users.add(this); | |
BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream())); | |
writer = new PrintStream(socket.getOutputStream(), false, "UTF-8"); | |
writer.println("Welcome to chat! What's your name?"); | |
String line = reader.readLine(); | |
if (line != null && line.length() > 0) { | |
name = line; | |
broadcast("user " + name + " joined."); | |
while ((line = reader.readLine()) != null) { | |
broadcast(name + " : " + line); | |
} | |
} | |
socket.close(); | |
} catch (IOException e) { | |
e.printStackTrace(); | |
} finally { | |
users.remove(this); | |
} | |
} | |
public static void broadcast(String message) { | |
for (Chat user : users) { | |
if (user.name != null) { | |
user.writer.println(message); | |
} | |
} | |
} | |
public static void main(String[] args) { | |
try { | |
ServerSocket listener = new ServerSocket(9000); | |
while (true) { | |
Socket socket = listener.accept(); | |
Chat chat = new Chat(socket); | |
new Thread(chat).start(); | |
} | |
} catch (IOException e) { | |
e.printStackTrace(); | |
} | |
} | |
} |
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