/*****************************
Para ejecutar:
1.- Instale Java Standard Edition development Kit (JDK)
si no lo tiene   http://java.sun.com
1.1.- Alternativamente puede correr estos comandos en
    aragorn.elo.utfsm.cl
2.- Configure adecuadamente la
variable de ambiente PATH 
3.- Compile el programa con:
% javac TCPServer.java
4.- Ejecute el programa con:
% java TCPServer
*******************************/

import java.io.*; 
import java.net.*; 

class TCPServer { 
   public static void main(String argv[]) throws Exception { 
      String clientSentence; 
      String capitalizedSentence; 
      ServerSocket welcomeSocket = new ServerSocket(6789); 
      while(true) { 
         Socket connectionSocket = welcomeSocket.accept(); 
         BufferedReader inFromClient = 
            new BufferedReader(new
                             InputStreamReader(
                               connectionSocket.getInputStream()));       
         DataOutputStream  outToClient = 
                new DataOutputStream(connectionSocket.getOutputStream()); 
         do {
            clientSentence = inFromClient.readLine(); 
            capitalizedSentence = clientSentence.toUpperCase() + "\n"; 
            outToClient.writeBytes(capitalizedSentence); 
         } while (clientSentence.compareTo("")!=0);
         outToClient.close();
      } 
   } 
}