ChatClient2.java

/* [ChatClient.java]
 * A not-so-pretty implementation of a basic chat client
 * @author Mangat
 * @ version 1.0a
 */

import java.awt.*;
import javax.swing.*;
import java.io.*;
import java.net.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
 
class ChatClient2 {
  
  private JButton sendButton, clearButton;
  private JTextField typeField;
  private JTextArea msgArea;  
  private JPanel southPanel;
  private Socket mySocket; //socket for connection
  private BufferedReader input; //reader for network stream
  private PrintWriter output;  //printwriter for network output
  private boolean running = true; //thread status via boolean
  
  public static void main(String[] args) { 
    new ChatClient2().go();
  }
    
  public void go() {
    JFrame window = new JFrame("Chat Client2");
    southPanel = new JPanel();
    southPanel.setLayout(new GridLayout(2,0));
    
    sendButton = new JButton("SEND");
    sendButton.addActionListener(new SendButtonListener());
    clearButton = new JButton("QUIT");
    clearButton.addActionListener(new QuitButtonListener());
    
    JLabel errorLabel = new JLabel("");
    
    typeField = new JTextField(10);
    
    msgArea = new JTextArea();
    
    southPanel.add(typeField);
    southPanel.add(sendButton);
    southPanel.add(errorLabel);
    southPanel.add(clearButton);
    
    window.add(BorderLayout.CENTER,msgArea);
    window.add(BorderLayout.SOUTH,southPanel);
    
    window.setSize(400,400);
    window.setVisible(true);
    
    // call a method that connects to the server 
    connect("192.168.2.21",5000);
    // after connecting loop and keep appending[.append()] to the JTextArea
    
    readMessagesFromServer();
    
  }
   
  //Attempts to connect to the server and creates the socket and streams
  public Socket connect(String ip, int port) { 
    System.out.println("Attempting to make a connection..");
    
    try {
      mySocket = new Socket("192.168.2.21",5000); //attempt socket connection (local address). This will wait until a connection is made
      
      InputStreamReader stream1 = new InputStreamReader(mySocket.getInputStream()); //Stream for network input
      input = new BufferedReader(stream1);     
      output = new PrintWriter(mySocket.getOutputStream()); //assign printwriter to network stream


      //** */
      try{ //displays the input from the server to the console
        System.out.println(input.readLine());
         
      }catch(NullPointerException npe){

        npe.printStackTrace();
      }



    } catch (IOException e) {  //connection error occured
      System.out.println("Connection to Server Failed");
      e.printStackTrace();
    }
    
    System.out.println("Connection made.");
    return mySocket;
  }
  
  //Starts a loop waiting for server input and then displays it on the textArea
  public void readMessagesFromServer() { 
    
  while(running) {  // loop unit a message is received
      try {
        
        if (input.ready()) { //check for an incoming messge
          String msg;          
          msg = input.readLine(); //read the message
          System.out.println("received: "+msg);
          msgArea.append(msg+"\n");
        }
        
      }catch (IOException e) { 
        System.out.println("Failed to receive msg from the server");
        e.printStackTrace();
      }
}
     try {  //after leaving the main loop we need to close all the sockets
      input.close();
      output.close();
      mySocket.close();
    }catch (Exception e) { 
      System.out.println("Failed to close socket");
    }
  
  }
  //****** Inner Classes for Action Listeners ****
  
    // send - send msg to server (also flush), then clear the JTextField
    class SendButtonListener implements ActionListener { 
     public void actionPerformed(ActionEvent event)  {
        //Send a message to the client
       output.println(typeField.getText());
       output.flush();             
       typeField.setText(""); 
     }     
   }

  // QuitButtonListener - Quit the program
     class QuitButtonListener implements ActionListener { 
     public void actionPerformed(ActionEvent event)  {
       running=false;
     }     
   }

  
}