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Thread: Chat Program Help

  1. #1
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    Default Chat Program Help

    I have some homework I need to finish but don't know how to do a part of it. Basically its a chat program that allows you to draw pictures to each other while you're chatting. I have everything working except I need to add a list for screen names and I need the screen names to show who typed what. Hopefully someone on here can help. Here is the code so far (5 different files but they work together). There is a server too.

    Project:
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    import java.io.*;
    import java.net.*;
     
    public class Project extends JFrame implements ActionListener{
     
    	JTextField tf;
    	JTextArea ta;
    	JScrollPane jsp;
    	JButton connect, close;	
    	Object in, out;
    	DataObject din, dout;
    	Socket s;
    	ObjectOutputStream oos;
    	ObjectInputStream ois;
    	Listener l;
     
    	DrawPanel dp;
    	JPanel cp; //chat panel
    	JPanel np; //name panel
     
    	public Project(){
     
    		setSize(500,400);
    		setTitle("My Chat Program (Alpha)");
    		setDefaultCloseOperation(EXIT_ON_CLOSE);
    		tf = new JTextField();
    		tf.addActionListener(this);
    		ta = new JTextArea();
    		jsp = new JScrollPane(ta);
     
    		connect = new JButton("Connect");
    		connect.addActionListener(this);
    		close = new JButton("Close");
    		close.addActionListener(this);
     
    		JPanel buttonpanel = new JPanel();
    		buttonpanel.add(connect);
    		buttonpanel.add(close);
     
    		dp = new DrawPanel(this);
     
    		cp = new JPanel();
    		cp.setLayout(new BorderLayout());
    		cp.add(tf,BorderLayout.NORTH);
    		cp.add(jsp, BorderLayout.CENTER);
     
    		np = new JPanel();
    		np.setLayout(new BorderLayout());
    		np.add(tf,BorderLayout.NORTH);
    		np.add(jsp, BorderLayout.CENTER);
     
    		JPanel wrapper = new JPanel();
    		wrapper.setLayout(new GridLayout(1,0));
    		wrapper.add(cp);
    		wrapper.add(dp);
    		wrapper.add(np);
     
    		getContentPane().add(wrapper, BorderLayout.CENTER);
    		getContentPane().add(buttonpanel, BorderLayout.SOUTH);
     
     
    		setVisible(true);
    	}
     
    	public void actionPerformed(ActionEvent ae){
    		Object obj = ae.getSource();
     
    		if(obj == connect){
    			try{
    				s = new Socket("localhost", 8189);
    				oos = new ObjectOutputStream(s.getOutputStream());
     
    				dout = new DataObject();
    				l = new Listener(s);
    				l.start();
    				connect.setEnabled(false);
     
    			}catch(Exception e){
     
    				System.out.println(e.getMessage());
    			}
    		}else{
    			String temp = tf.getText();
    			tf.setText("");
    			dout.setMessage(temp);
    			try{	
    				oos.writeObject(dout);
    				oos.reset();
    			}catch(Exception e){
     
    				System.out.println(e.getMessage());
    			}
    			//ta.append(temp + "\n");
    		}
    	}
     
    	class Listener extends Thread{
     
    		Socket s;
     
    		public Listener(Socket s){
    			this.s = s;
    		}
    		public void run(){
    		   try{
    		       ois = new ObjectInputStream(s.getInputStream());
     
    		       while(true){
    		          in = ois.readObject();
     
    			  if(in instanceof DataObject){
    			     din = (DataObject)in;
    			     String text = din.getMessage() + "\n";
    			     ta.append(text);
    			     SwingUtilities.invokeLater(new Runnable() {
            		          public void run() {
                  			      ta.setCaretPosition(ta.getText().length());
            			  }
          			     });
     
    			   }else if(in instanceof LineObject){
     
    				LineObject lo = (LineObject)in;
    				dp.backg.drawLine(lo.getStartX(), lo.getStartY(), 
    					lo.getEndX(), lo.getEndY());
    				dp.record(lo.getEndX(), lo.getEndY());
          				dp.repaint();
     
    				//grab the drawpanel
    				//draw the current line	
     
    			   }
    		      }//end while
    		   }catch(Exception e){
    			System.out.println(e.getMessage());
    		   }	
    		}
     
    	}
     
     
    	public static void main(String[] args){
     
    		new Project();
     
    	}
    }


    Server:
    import java.io.*;
    import java.net.*;
    import java.util.*;
     
    public class Server{
     
    	public static void main(String[] args) throws Exception{
    		ArrayList handlerList = new ArrayList();
    		ServerSocket ss = new ServerSocket(8189);
    		while(true){
    			Socket s = ss.accept();
    			Handler h = new Handler(s, handlerList);
    			h.start();
    			handlerList.add(h);
    		}
    	}
    }
     
    class Handler extends Thread{
     
    	Socket s;
    	//DataObject d;
    	Object d;	
    	ArrayList handlers;
    	ObjectInputStream ois;
    	ObjectOutputStream oos;
     
    	public Handler(Socket s, ArrayList al){
     
    		this.s = s;
    		handlers = al;
    	}
     
    	public void broadcast(Object in){
    		Iterator itr = handlers.iterator();
     
        		//use hasNext() and next() methods to iterate through the elements
        		//System.out.println("Iterating through ArrayList elements...");
        		while(itr.hasNext()){
          			Handler current = (Handler)itr.next();
    			current.writeObject(in);
     
    		}
     
    	}
    	public void writeObject(Object d){
    		try{
    			oos.writeObject(d);
    			oos.reset();
    		}catch(Exception e){
    			System.out.println(e.getMessage());
    		}
    	}
     
    	public void run(){
    		try{
    			ois = new ObjectInputStream(s.getInputStream());
    			oos = new ObjectOutputStream(s.getOutputStream());
    			while(true){
    				d = ois.readObject();
    				if(d == null){
    					break;
    				}	
    				//System.out.println(d.getMessage());
     
    				//d.setMessage("This is the changed message.");
    				//System.out.println(d.getMessage());		
     
    				broadcast(d);
    				//oos.writeObject(d);
    				//oos.reset();
    			}
     
     
    			ois.close();
    			oos.close();
    			s.close();
    		}catch(IOException ioe){
    			System.out.println(ioe.getMessage());
    		}catch(ClassNotFoundException cnfe){
    			System.out.println("Class DataObject not found.");
    		}
    	}
    }
    /*
    ArrayList arrayList = new ArrayList();
     
        //Add elements to Arraylist
        arrayList.add("1");
        arrayList.add("2");
        arrayList.add("3");
        arrayList.add("4");
        arrayList.add("5");
     
        Iterator itr = arrayList.iterator();
     
        while(itr.hasNext())
          System.out.println(itr.next());
    */


    Data Object:
    (For Server and Project)
    import java.io.*;
     
    public class DataObject implements Serializable{
     
    	String message;
     
    	public DataObject(){}
     
    	public void setMessage(String m){
     
    		message = m;
    	}
    	public String getMessage(){
     
    		return message;
    	}
    }

    DrawPanel:
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
     
    public class DrawPanel extends Panel
    	implements MouseListener, MouseMotionListener {
     
    	int lastx, lasty;
       	int width, height;
       	Image backbuffer;
       	Graphics backg;
    		LineObject lo;
    		Project parent;
     
       	public DrawPanel() {
          	width = 400;
          	height = 400;
    			Dimension d = new Dimension(width, height);
          	setPreferredSize(d);	
    			addMouseListener(this);
    			addMouseMotionListener( this );
       	}
    	public DrawPanel(Project p){
    		this();
    		parent = p;
     
    	}
    	public void record(int x, int y){
    		lastx = x;
    		lasty = y;
    	}
       	public void createBackBuffer(){
     
          		backbuffer = createImage( width, height );
          		backg = backbuffer.getGraphics();
          		backg.setColor( Color.black );
          		backg.fillRect( 0, 0, width, height );
          		backg.setColor( Color.white );
       	}
     
    	public void mouseEntered( MouseEvent e ) { 
    		record(e.getX(), e.getY());
    	}
    	public void mouseExited( MouseEvent e ) { }
    	public void mousePressed( MouseEvent e ) {
    		record(e.getX(), e.getY());
    	}
    	public void mouseClicked( MouseEvent e ) { 
    		if(e.getModifiers() == InputEvent.BUTTON3_MASK){
    			backg.setColor( Color.black );
          			backg.fillRect( 0, 0, width, height );
          			backg.setColor( Color.white );
    			repaint();
    		}
    	}
    	public void mouseReleased( MouseEvent e ) { }
     
     
     
       	public void mouseMoved( MouseEvent e ) { }
       	public void mouseDragged( MouseEvent e ) {
          		int x = e.getX();
          		int y = e.getY();
     
    		lo = new LineObject(lastx, lasty, x, y);
     
    		//backg.drawLine(lo.getStartX(), lo.getStartY(), 
    		//			lo.getEndX(), lo.getEndY());
     
     
    		//record(x, y);
          		//repaint();
          		//e.consume();
     
    		try{	
    			parent.oos.writeObject(lo);
    			parent.oos.reset();
    		}catch(Exception ex){
    			System.out.println(ex.getMessage());
    		}
       	}
     
       	public void update( Graphics g ) {
    		if(backg == null){	
    			createBackBuffer();
    		}
          		g.drawImage( backbuffer, 0, 0, this );
       	}
     
       	public void paint( Graphics g ) {
          		update( g );
       	}
     
    	public static void main(String[] args){
    		DrawPanel dp = new DrawPanel();	
    		dp.setSize(400,400);
     
    		Frame f = new Frame();
    		f.setSize(400,400);
    		f.setTitle("Drawing");
    		f.addWindowListener(new WindowAdapter(){
    			public void windowClosing(WindowEvent we){
     
    				System.exit(0);
    			}
    		});
     
    		f.add(dp, BorderLayout.CENTER);
    		f.pack();
    		f.setVisible(true);
    	}
    }

    Line Object:
    (For Draw Panel and Project)
    import java.io.*;
     
    public class LineObject implements Serializable{
     
    	int startx, starty, endx, endy;
     
    	public LineObject(int sx, int sy, int ex, int ey){ 
     
    		startx = sx;
    		starty = sy;
    		endx = ex;
    		endy = ey;
    	}
    	public void setLine(int sx, int sy, int ex, int ey){ 
     
    		startx = sx;
    		starty = sy;
    		endx = ex;
    		endy = ey;
    	}
     
    	public int getStartX(){
    		return startx;
    	}
    	public int getStartY(){
    		return starty;
    	}
    	public int getEndX(){
    		return endx;
    	}
    	public int getEndY(){
    		return endy;
    	}
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Chat Program Help

    Cross posted at Chat Program Help
    If you don't understand my answer, don't ignore it, ask a question.

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