Contoh Program Java Multi Chat

Artikel Kali ini yaitu tentang program java multichat, diman program ini bisa melakukan chat dengan sesama komputer cuma hanya menganti sebuah alamat IP di programnya. Bisa juga dengan cara salah satu komputer dijadikan sebuah server untuk melihat siapa saja yang telah login dan chat dengan orang lain.

Langsung aja, ne berikut programmnya, program ini menggunakan java JCreator. Nanti klo dah jalan, yang pertama dijalankan yaitu multichatclientnya.

/* Program multichatserver
/* multichatserver.java

import java.net.*;
import java.awt.event.*;
import java.awt.*;
import java.io.*;
import java.util.*;

class  ClientInfo{
String name;
Socket cs;
public ClientInfo(String nm,Socket s)
{
name = nm;
cs = s;
}
}
public class multichatserver {
ServerSocket  ss;
Socket s;
Hashtable list;
PrintStream chatLog;
Vector namevect;
public multichatserver()
{
list = new Hashtable();
namevect = new Vector();
try
{
chatLog = new PrintStream(new FileOutputStream("multichat.log"));
}catch(IOException e)
{
System.out.println("Error opening file");
System.exit(1);
}
   try{
ss = new ServerSocket(2000);
while(true)
{
 System.out.println("SERVER READY TO TAKE REQUESTS");
 s = ss.accept();
 new FileThread(s).start();
}
}catch(IOException ioe)
{
System.out.println("IOException Caught");
}
}
class FileThread extends Thread{

Socket fs;
BufferedReader br;
String name;
public FileThread(Socket s)
{
fs = s;
}
public void run()
{
try
{
InputStream  is = fs.getInputStream();
OutputStream os = fs.getOutputStream();
br = new BufferedReader (new InputStreamReader(is));
while((name = br.readLine())!=null)
{
  if(list.containsKey(name))
  {
    continue;
  }
  else
  {
  ClientInfo cinfo = new ClientInfo(name,fs);
  chatLog.println(name+" Registered from Host:"+fs.getInetAddress().getHostName()+"and IP address:"+fs.getInetAddress().getHostAddress() );
  list.put(name,cinfo);
  Enumeration enum1 = list.elements();
  namevect.addElement(name);
  while(enum1.hasMoreElements())
  {
    ClientInfo clinfo =(ClientInfo)enum1.nextElement();
    System.out.println("client name"+clinfo.name);
    new DataOutputStream(clinfo.cs.getOutputStream()).writeInt(1);
    ObjectOutputStream obos = new ObjectOutputStream(clinfo.cs.getOutputStream());
    obos.writeObject(namevect);
    obos.flush();
  }
  new messageThread(name,fs).start();
  System.out.println("Thread Started.");
  break;
  }
   }

   }
   catch(IOException ioe)
   {
   System.out.println("IOException Caught");
   }
}
}
class messageThread extends Thread{
Socket ms;
String name;
public messageThread(String nm,Socket s)
{
ms = s;
name = nm;
}
public void run()
{
InputStream is;
OutputStream os;
BufferedReader br;
String message;
try{
is = ms.getInputStream();
    os = ms.getOutputStream();
    br = new BufferedReader(new InputStreamReader(is));

while((message = br.readLine())!=null)
    {
   System.out.println("message sent from "+ name);
       Enumeration en = list.elements();
   while(en.hasMoreElements())
    {
     ClientInfo clinf = (ClientInfo)en.nextElement();
     if(!clinf.name.equals(name))
     {
       new DataOutputStream(clinf.cs.getOutputStream()).writeInt(0);
      
      PrintWriter pw = new PrintWriter(new OutputStreamWriter(clinf.cs.getOutputStream()),true);
      pw.println(name+": "+message);
        }
 
    }
   }
   System.out.println("out of while loop");

}catch(IOException ioe)
{
list.remove(name);
chatLog.println(name + "Quits.");
return;
}

}
  }
  public static void main(String args[])
  {
  multichatserver mcs = new multichatserver();
  }
}


Kemudian Program Keduannya yaitu : "Simpan dengan extensi java, menggunakan JCreator".
/* Program multichatclient
/* multichatclient.java


import java.io.*;
import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;


public class multichatclient extends Frame implements ActionListener,KeyListener {

Label meslabel;
Vector namevect;
TextField mesg;
Button send,login,exit;
TextArea ta,usrlist;
Panel top,mid,bot;
String message,messg,usr,name;
InputStream is ;
OutputStream os ;
BufferedReader br ;
PrintStream ps ;
Socket s;
public multichatclient(String title)
{
super(title);
initComponents();
setLayout(new BorderLayout());
top = new Panel();
top.setLayout(new GridLayout(1,2));
bot = new Panel();
bot.setLayout(new GridLayout(1,3,5,5));
setSize(500,500);
setBackground(Color.gray);
setForeground(Color.black);
meslabel = new Label("Message",Label.RIGHT);
mesg = new TextField(20);
ta = new TextArea("Client: hello!\n",50,50,TextArea.SCROLLBARS_BOTH);
usrlist = new TextArea("user list",50,20,TextArea.SCROLLBARS_BOTH);
send = new Button("Send");
login = new Button("Login");
exit = new Button("Exit");
send.setEnabled(false);
top.add(meslabel);
top.add(mesg);
bot.add(login);
bot.add(send);
bot.add(exit);
add(top,BorderLayout.NORTH);
add(bot,BorderLayout.SOUTH);
add(ta,BorderLayout.CENTER);
add(usrlist,BorderLayout.EAST);
send.addActionListener(this);
mesg.addKeyListener(this);
login.addActionListener(this);
exit.addActionListener(this);
try
 {
s = new Socket("192.168.7.27",2000);
is = s.getInputStream();
os = s.getOutputStream();
ps = new PrintStream(os);
  } catch(IOException ie)
  {
  ie.printStackTrace();
  }
  }
public void actionPerformed(ActionEvent ae)
{
Button btn = (Button)ae.getSource();
byte reply = 0;
if(btn == login)
{
loginDialog ld = new loginDialog(this);
ld.show();
usr = ld.user;

ps.println(usr);
ps.flush();
login.setEnabled(false);
send.setEnabled(true);
new MessageReader().start();
}
if(btn == send)
{
  String txt = mesg.getText();
  ps.println(txt);
  ps.flush();
  ta.append(txt+"\n");
          mesg.setText("");
       }
if(btn == exit)
{
try
{
s.close();
}catch(IOException ioe)
{
}
System.exit(1);
}
}
public void keyPressed(KeyEvent ke)
{
}
public void keyReleased(KeyEvent ke)
{
}
public void keyTyped(KeyEvent ke)
{
}
    public void initComponents()
    {
addWindowListener(new WindowAdapter(){
public void  windowClosing(WindowEvent we)
{
setVisible(false);
}
});
}
 class MessageReader extends Thread {
 int check=0;
 ObjectInputStream objis;
 DataInputStream dis;
 String msg;
 public void run()
   {
  try
   {
   while(true)
   {
   dis = new DataInputStream(is);
   check = dis.readInt();
   if(check == 1)
   {
     objis = new ObjectInputStream(is);
       namevect =(Vector)objis.readObject();
       System.out.println("No of users in list:"+namevect.size());
       Enumeration en = namevect.elements();
       usrlist.setText("User List");
     while(en.hasMoreElements())
      {
        name = (String)en.nextElement();
        System.out.println("name added to list:"+name);
        usrlist.append("\n"+name);
        }
        System.out.println("check: "+check);
       }
       else
       {
   br = new BufferedReader(new InputStreamReader(is));
   msg = br.readLine();
   ta.append(msg+"\n");
   while((msg = br.readLine())!=null)
   {
 String mymsg = msg;
 mymsg = mymsg.substring(4,mymsg.length()-1);
 System.out.println("message received is:"+mymsg);
 //mymsg = "hello";
 JOptionPane.showMessageDialog(null,mymsg,"Message Received",JOptionPane.INFORMATION_MESSAGE);
 ta.append(mymsg+"\n");
 System.out.println("check: "+check);
   }
   }
   }
      }catch(Exception e)
   {
     System.out.println(e);
   }
      }
 }
  public static void main(String s[])
    {
      multichatclient mcc= new multichatclient("Messenger");
      mcc.setVisible(true);
      mcc.show();
    }
}
class  loginDialog extends Dialog implements ActionListener{
Label loginname;
TextField logintext;
Button okay;
Panel top,central;
String user;

loginDialog(Frame parent)
{
super(parent,"User Login",true);
setSize(400,100);
setResizable(false);
setFont(new Font("ComicSans",Font.BOLD|Font.ITALIC,15));
loginname = new Label("Enter Login:",Label.RIGHT);
logintext = new TextField(15);
okay = new Button("OK");

top = new Panel();
central = new Panel();
central.setLayout(new FlowLayout());
top.setLayout(new GridLayout(1,2,5,5));
top.add(loginname);
top.add(logintext);
central.add(okay);
add(central,BorderLayout.CENTER);
add(top,BorderLayout.NORTH);
okay.addActionListener(this);
}
public void actionPerformed(ActionEvent ae)
{
user = logintext.getText();
dispose();
}
}

Output :