Java tutorial
import java.io.IOException; import java.io.OutputStream; import java.net.ServerSocket; import java.net.Socket; public class MainClass { public static void main(String[] args) throws Exception { int port = 37; ServerSocket server = new ServerSocket(port); while (true) { Socket connection = null; connection = server.accept(); OutputStream out = connection.getOutputStream(); out.write(123); out.flush(); connection.close(); } } }