Embedded Chat Applet in HTML

[Tuan Bui]

Hi all,

I came across this site in search of help with a project for my java class. I have the parts but I have no idea as how to put them together. I need to embed this applet in html that also have a button on the bottom right for the user to login. The layout must have a text field, a list of users logged in on the right panel and on the bottom a textarea. I must use the dataobject give. Please help...I am trying it but not I don't know programming at all...this is way over my head. At this point I just want to get it to work so I can get some points. Thanks for your time and efforts.

import java.io.*;
import java.util.*;
 
public class DataObject implements Serializable{

private String name;
private String message;
private String command;
 
DataObject(){
message = "";
}

public String getName(){
return name;
}
 
public void setName(String in){
name = in;
}
 
public String getMessage(){
return message;
}
 
public void setMessage(String in){
message = in;
}
 
public String getCommand(){
return command;
}
 
public void setCommand(String in){
command = in;
}


 
}
 
 
 
import java.io.*;
import java.net.*;
import java.util.*;
 
public class ThreadedTuanChatServer
{  public static void main(String[] args) 
   {  

      try 
      { 
 if(args.length!=1){
 
System.err.println("Need a port number!!!!");
System.exit(0);
 }
 ServerSocket s = new ServerSocket(Integer.parseInt(args[0]));
 Vector v = new Vector();
         
         for (;  :wink:  
         {  Socket incoming = s.accept( );
            new ThreadedTuanChatHandler(incoming, v).start();
             
 }   
      }
      catch (Exception e) 
      {  System.out.println(e);
      } 
   } 
}
 
class ThreadedTuanChatHandler extends Thread 
{  public ThreadedTuanChatHandler(Socket i, Vector h) 
   { 
handlers = h;
   incoming = i;
   }
   
   public void run()
   {  try 
      { in = new ObjectInputStream(incoming.getInputStream());
 
out = new ObjectOutputStream(incoming.getOutputStream());
 
handlers.addElement(this);
 

boolean done = false;
         while (!done)
         {  
 
try{
myObject = (DataObject)in.readObject();
String str = myObject.getMessage();
DataObject temp = new DataObject();
temp.setMessage(str);
System.out.println("Message read: " + temp.getMessage());
System.out.println("Vector size: " + handlers.size());

            if (str == null){
 
 done = true;
}else{  

for (Enumeration e = handlers.elements() ; e.hasMoreElements()   :wink:   {
         ThreadedTuanChatHandler tch = (ThreadedTuanChatHandler)e.nextElement();
tch.out.writeObject(temp);
     }
 
 
//out.writeObject(myObject);
out.reset();
               if (str.endsWith("BYE")) 
                  done = true;
            }
}catch(Exception e){
 
if(e instanceof java.io.EOFException){
handlers.removeElement(this);
done = true;
System.out.println("Client Left");
}
}
         }
 
//myObject.setMessage("Got it!");
 
//System.out.println("Message written: " + myObject.getMessage());
 
//out.writeObject(myObject);

in.close();

out.close();
 
         incoming.close();    
    
      }
      catch (Exception e) 
      {  System.out.println(e);
      } 
   }
   
   Vector handlers;      
   DataObject myObject = null;
   private Socket incoming;
   ObjectInputStream in;
   ObjectOutputStream out;
   
}
 
 
import java.io.*;
import java.net.*;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
 
public class TuanChatClient extends Applet implements ActionListener{
 
DataObject myObject;
TextField tf;
TextArea ta;
Button b;
Vector v;
Socket socketToServer;
ObjectOutputStream myOutputStream;
ObjectInputStream myInputStream;
String newline;
String name;
SocketListener sl;

 
public void init(){
setLayout(new BorderLayout());
myObject = new DataObject();
tf = new TextField();
tf.addActionListener(this);
ta = new TextArea();
b = new Button("Connect");
b.addActionListener(this);
v = new Vector();
add(tf, BorderLayout.NORTH);
add(ta, BorderLayout.CENTER);
add(b, BorderLayout.SOUTH);
newline = System.getProperty("line.separator");
tf.setText("Enter Name");
tf.selectAll();
}
 
public void start(){
 
}
 
 
public void stop(){
 
}
 
public void destroy(){
 
}
 
public void actionPerformed(ActionEvent ae){
 
Object o = ae.getSource();
if(o instanceof Button){
if(b.getLabel().equals("Connect")){

String ip = getParameter("ip");
int port = Integer.parseInt(getParameter("port"));
try{
socketToServer = new Socket(ip, port);
 
myOutputStream = new ObjectOutputStream(socketToServer.getOutputStream());

//myInputStream = new ObjectInputStream(socketToServer.getInputStream());
 
sl = new SocketListener();

sl.start();

ta.append("LOGGED IN" + newline);
 
}catch(Exception e){
 
ta.append("COULD NOT CONNECT!!!!" + newline);
}
 

b.setLabel("Disconnect");
}else{
 
 
try{
sl = null;
 
myOutputStream.close();

myInputStream.close();
 
socketToServer.close();
}catch(Exception e){
 
ta.append("COULD NOT DISCONNECT!!!" + newline);
}
 
b.setLabel("Connect");
}//end else getLabel
 


}else{
String temp = tf.getText().trim();
if(name == null){
name = temp;
tf.setText("");
}else{
 
myObject.setMessage(name + ": " + temp);
try{
myOutputStream.writeObject(myObject);
myOutputStream.reset();
tf.setText("");

}catch(Exception e){
ta.append("PROBLEM SENDING MESSAGE!!!" + newline);
}

}
 
}
 
}
class SocketListener extends Thread{

SocketListener(){
 
try{
myInputStream = new ObjectInputStream(socketToServer.getInputStream());
}catch(Exception e){
 
System.out.println("COULD NOT CREATE SOCKETLISTENER!!!");
}
}
public void run(){
System.out.println("SocketListener Started!!!");
DataObject inObject = new DataObject();
while(sl != null){
try{
inObject = (DataObject)myInputStream.readObject();
ta.append("Messaged received : " + inObject.getMessage() + newline);
}catch(Exception e){
if(e.getLocalizedMessage().equals("socket closed")){

ta.append("LOGGED OUT" + newline);
}else{
ta.append("PROBLEM RECEIVING MESSAGE!!!" + newline);
}
}

}//end while
}
}
}

[ UD: added CODE tags ]
[ April 28, 2008: Message edited by: Ulf Dittmer ]

[Ulf Dittmer]

Welcome to JavaRanch.

At this point I just want to get it to work so I can get some points.

I hear what you're saying, but that's really not how JavaRanch works. We don't hand out solutions to someone's homework. Instead, we're trying to guide people towards coming up with their own solutions.

That's quite a list of requirements you need to implement. Let's tackle these one by one, e.g. by getting the GUI right before handling client/server communication, before adding the list of users. So ... what does the code do now, and where does it deviate from you'd like it to do?

As an aside, I'd say that building a multi-client/server communications scheme is not the best project to get started with if you're new to programming.

By the way, please UseCodeTags when posting code of any length. Otherwise it's unnecessarily hard to read and understand.