TCPServer.java

package classic.tcp;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

public 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();
			System.out.println("Received: " + clientSentence);
			capitalizedSentence = clientSentence.toUpperCase() + '\n';
			outToClient.writeBytes(capitalizedSentence);
		}
		//welcomeSocket.close();
	}
}