Echo Server in JAVA

Echo Server in JAVA :

Client Program:

TCPClient.java

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

public class TCPClient {
    public static void main(String argv[]) throws Exception {

        String sentence;

        String modifiedSentence;

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

        Socket clientSocket = new Socket("localhost", 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(modifiedSentence);

        clientSocket.close();

    }

}

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Server Program:

TCPServer.java

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import java.io.*;
import java.net.*;
public 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);

        }

    }

}

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