math-web-socket

Computer Networks semester project

Code sample (Java)

Client

import java.io.*; 
import java.net.*; 
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("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(); 
                         
          } 
      } 

Server

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); 
        } 
    } 
}