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Thread: Which protocol this simple chat application is using?

  1. #1
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    Default Which protocol this simple chat application is using?

    Which protocol this simple chat application is using?
    TCP or UDP?

    Server.java
    import java.io.*;
    import java.net.*;
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
     
    public class Server extends JFrame{
     
       private JTextField userText;
       private JTextArea chatWindow;
       private ObjectOutputStream output;
       private ObjectInputStream input;
       private ServerSocket server;
       private Socket connection;
     
       //constructor
       public Server(){
          super("Messenger");
          userText = new JTextField();
          userText.setEditable(false);
          userText.addActionListener(
             new ActionListener(){
                public void actionPerformed(ActionEvent event){
                   sendMessage(event.getActionCommand());
                   userText.setText("");
                }
             }
          );
          add(userText, BorderLayout.NORTH);
          chatWindow = new JTextArea();
          add(new JScrollPane(chatWindow));
          setSize(300,150);
          setVisible(true);
       }
     
       //set up and run the server
       public void startRunning(){
          try{
             server = new ServerSocket(6789, 100);
             while(true){
                try{
                   waitForConnection();
                   setupStreams();
                   whileChatting();
                }catch(EOFException eofException){
                   showMessage("\n Server ended the connection! ");
                }finally{
                   closeCrap();
                }
             }
          }catch(IOException ioException){
             ioException.printStackTrace();
          }
       }
     
       //wait for connection, then display connection information
       private void waitForConnection() throws IOException{
          showMessage(" Waiting for someone to connect... \n");
          connection = server.accept();
          showMessage(" Now connected to " + connection.getInetAddress().getHostName());
       }
     
       //get stream to send and receive data
       private void setupStreams() throws IOException{
          output = new ObjectOutputStream(connection.getOutputStream());
          output.flush();
          input = new ObjectInputStream(connection.getInputStream());
          showMessage("\n Streams are now setup! \n");
       }
     
       //during the chat conversation
       private void whileChatting() throws IOException{
          String message = " You are now connected! ";
          sendMessage(message);
          ableToType(true);
          do{
             try{
                message = (String) input.readObject();
                showMessage("\n" + message);
             }catch(ClassNotFoundException classNotFoundException){
                showMessage("\n I dont know what that user sent!");
             }
          }while(!message.equals("CLIENT - END"));
       }
     
       //close streams and sockets after you are done chatting
       private void closeCrap(){
          showMessage("\n Closing connections... \n");
          ableToType(false);
          try{
             output.close();
             input.close();
             connection.close();
          }catch(IOException ioException){
             ioException.printStackTrace();
          }
       }
     
       //send a message to client
       private void sendMessage(String message){
          try{
             output.writeObject("SERVER - " + message);
             output.flush();
             showMessage("\nSERVER - " + message);
          }catch(IOException ioException){
             chatWindow.append("\n ERROR: I CANT SEND THAT MESSAGE");
          }
       }
     
       //updates chatWindow
       private void showMessage(final String text){
          SwingUtilities.invokeLater(
             new Runnable(){
                public void run(){
                   chatWindow.append(text);
                }
             }
          );
       }
     
       //let the user type stuff into their box
       private void ableToType(final boolean tof){
          SwingUtilities.invokeLater(
             new Runnable(){
                public void run(){
                   userText.setEditable(tof);
                }
             }
          );
       }
     
    }

    Client.java

    import java.io.*;
    import java.net.*;
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
     
    public class Client extends JFrame{
     
       private JTextField userText;
       private JTextArea chatWindow;
       private ObjectOutputStream output;
       private ObjectInputStream input;
       private String message = "";
       private String serverIP;
       private Socket connection;
     
       //constructor
       public Client(String host){
          super("Client - User !");
          serverIP = host;
          userText = new JTextField();
          userText.setEditable(false);
          userText.addActionListener(
             new ActionListener(){
                public void actionPerformed(ActionEvent event){
                   sendMessage(event.getActionCommand());
                   userText.setText("");
                }
             }
          );
          add(userText, BorderLayout.NORTH);
          chatWindow = new JTextArea();
          add(new JScrollPane(chatWindow), BorderLayout.CENTER);
          setSize(300,150);
          setVisible(true);
       }
     
       //connect to server
       public void startRunning(){
          try{
             connectToServer();
             setupStreams();
             whileChatting();
          }catch(EOFException eofException){
             showMessage("\n Client terminated connection");
          }catch(IOException ioException){
             ioException.printStackTrace();
          }finally{
             closeCrap();
          }
       }
     
       //connect to server
       private void connectToServer() throws IOException{
          showMessage("Attempting connection... \n");
          connection = new Socket(InetAddress.getByName(serverIP), 6789);
          showMessage("Connected to: " + connection.getInetAddress().getHostName() );
       }
     
       //set up streams to send and receive messages
       private void setupStreams() throws IOException{
          output = new ObjectOutputStream(connection.getOutputStream());
          output.flush();
          input = new ObjectInputStream(connection.getInputStream());
          showMessage("\n Your streams are now good to go! \n");
       }
     
       //while chatting with server
       private void whileChatting() throws IOException{
          ableToType(true);
          do{
             try{
                message = (String) input.readObject();
                showMessage("\n" + message);
             }catch(ClassNotFoundException classNotfoundException){
                showMessage("\n I dont know that object type");
             }
          }while(!message.equals("SERVER - END"));
       }
     
       //close the streams and sockets
       private void closeCrap(){
          showMessage("\n closing chat down...");
          ableToType(false);
          try{
             output.close();
             input.close();
             connection.close();
          }catch(IOException ioException){
             ioException.printStackTrace();
          }
       }
     
       //send messages to server
       private void sendMessage(String message){
          try{
             output.writeObject("CLIENT - " + message);
             output.flush();
             showMessage("\nCLIENT - " + message);
          }catch(IOException ioException){
             chatWindow.append("\n something messed up sending message!");
          }
       }
     
       //change/update chatWindow
       private void showMessage(final String m){
          SwingUtilities.invokeLater(
             new Runnable(){
                public void run(){
                   chatWindow.append(m);
                }
             }
          );
       }
     
       //gives user permission to type crap into the text box
       private void ableToType(final boolean tof){
          SwingUtilities.invokeLater(
             new Runnable(){
                public void run(){
                   userText.setEditable(tof);
                }
             }
          );      
       }
    }
    Last edited by Kamrava; April 7th, 2014 at 06:44 AM.


  2. #2
    Junior Member Crash's Avatar
    Join Date
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    Default Re: Which protocol this simple chat application is using?

    If i'm not mistaken it's using TCP since its using Socket and not DatagramSocket but i'm not sure.

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