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Server.java
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Server.java
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import java.io.BufferedReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.io.InputStreamReader;
public class Server implements Runnable{
private ArrayList<ConnectionHandler> connections;
private ServerSocket server;
private boolean done;
private ExecutorService pool;
public Server(){
connections = new ArrayList<>();
done = false;
}
@Override
public void run(){
try {
server = new ServerSocket(9999);
pool = Executors.newCachedThreadPool();
while (!done){
Socket client = server.accept();
ConnectionHandler handler = new ConnectionHandler(client);
connections.add(handler);
pool.execute(handler);
}
} catch (Exception e) {
shutdown();
}
}
public void broadcast(String message){
for (ConnectionHandler ch : connections){
if (ch != null)
ch.sendMessage(message);
}
}
public void shutdown(){
try {
done = true;
pool.shutdown();
if (!server.isClosed()){
server.close();
}
for (ConnectionHandler ch : connections){
ch.shutdown();
}
} catch (IOException e){
//ignore
}
}
class ConnectionHandler implements Runnable{
private Socket client;
private BufferedReader in;
private PrintWriter out;
private String nickname;
public ConnectionHandler(Socket client){
this.client = client;
}
@Override
public void run(){
try {
out = new PrintWriter(client.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(client.getInputStream()));
out.println("Please enter a nickname: ");
nickname = in.readLine();
if (connections.contains?(nickname)){
out.println("Please enter a currect nickname.");
}
else{
System.out.println(nickname + " connected!");
broadcast(nickname + " joined the chat!");
String message;
while ((message = in.readLine()) != null){
if (message.startsWith("/nick ")){
String[] messageSplit = message.split(" ", 2);
if (messageSplit.length == 2){
broadcast(nickname + " changed their nickname to " + messageSplit[1]);
nickname = messageSplit[1];
out.println("Successfully changed nickname to " + nickname);
} else {
out.println("No nickname provided!");
}
} else if (message.startsWith("/quit")){
broadcast(nickname + " left the chat!");
shutdown();
} else {
broadcast(nickname + ": " + message);
}
}
}
} catch (IOException e) {
shutdown();
}
}
public void sendMessage(String message){
out.println(message);
}
public void shutdown(){
try {
in.close();
out.close();
if (!client.isClosed()){
client.close();
}
} catch (IOException e){
//ignore
}
}
}
public static void main(String[] args) {
Server server = new Server();
server.run();
}
}