A multithreaded Socket Server : ServerSocket « Network « Java Tutorial

1. Java Tutorial
2. Network
3. ServerSocket

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class EchoServer {
  public static void main(String[] args) throws Exception {
    ServerSocket m_ServerSocket = new ServerSocket(12111);
    int id = 0;
    while (true) {
      Socket clientSocket = m_ServerSocket.accept();
      ClientServiceThread cliThread = new ClientServiceThread(clientSocket, id++);
      cliThread.start();
    }
  }
}

class ClientServiceThread extends Thread {
  Socket clientSocket;
  int clientID = -1;
  boolean running = true;

  ClientServiceThread(Socket s, int i) {
    clientSocket = s;
    clientID = i;
  }

  public void run() {
    System.out.println("Accepted Client : ID - " + clientID + " : Address - "
        + clientSocket.getInetAddress().getHostName());
    try {
      BufferedReader   in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
      PrintWriter   out = new PrintWriter(new OutputStreamWriter(clientSocket.getOutputStream()));
      while (running) {
        String clientCommand = in.readLine();
        System.out.println("Client Says :" + clientCommand);
        if (clientCommand.equalsIgnoreCase("quit")) {
          running = false;
          System.out.print("Stopping client thread for client : " + clientID);
        } else {
          out.println(clientCommand);
          out.flush();
        }
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}