Compilar

– Versão servidora ? nome do arquivo TCPServer.java

import <a href="http://java.io">java.io</a>.<em>;

import <a href="http://java.net">java.net</a>.</em>;

class TCPServer {

public static void main(String args[]) 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);

System.out.println("FROM CLIENT: " + clientSentence);

}

}

}

– Versão Cliente ? nome do arquivo TCPClient.java

import <a href="http://java.io">java.io</a>.<em>;

import <a href="http://java.net">java.net</a>.</em>;

class TCPClient {

public static void main(String args[]) throws Exception

{

String sentence;

String modifiedSentence;

BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in));

Socket clientSocket = new Socket(“127.0.0.1”, 6789);

DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());

BufferedReader inFromServer =  new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));

sentence = inFromUser.readLine();

outToServer.writeBytes(sentence + ‘\n’);

modifiedSentence = inFromServer.readLine();

System.out.println("FROM SERVER: " + modifiedSentence);

clientSocket.close();

}

}