/*****************************
Para ejecutar:
1.- Instale Java Standard Edition development Kit (JDK)
si no lo tiene   http://java.sun.com
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()); 
        clientSentence = inFromClient.readLine(); 
        capitalizedSentence = clientSentence.toUpperCase() + '\n'; 
        outToClient.writeBytes(capitalizedSentence); 
      } 
    } 
}