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| Java Chat room application using UDP |
Protocol) for chatting. The application gives you to options. One is to create a new chat room and the other is to join a chat room. The one who creates the chat room acts as a server for the chatroom. Others can join this chatroom id they know his IP address. This simple java chat room application is enough for server and clients. The GUI is basic one and not too attractive. Also i have used JOptionPane to reduce code. You may make improvements to the code. The chat rooms are not password protected. Anyone who know the server's IP address are granted access to the chat room. If you wish, you may improve the program. This Group chat application using java can be used in Local area networks. This code for java group chat program can be modified to enable chatting in multiple chat rooms. Try it.
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.util.ArrayList;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.WindowConstants;
public class ChatRoom extends JFrame{
public static final int HOST_MODE=0;
public static final int CLIENT_MODE=1;
JButton btn_send;
JScrollPane jScrollPane1;
JTextArea jTextArea1;
JLabel lbl_ipNroomName;
JTextField txt_mymsg;
int mode;
String Name;
String roomname;
InetAddress hostip;
ChatRoom pt;
DatagramSocket socket;
ArrayList<client> ClientList;
byte[] b;
public ChatRoom(String myname,int mod,String ip,String room)
{
try{
Name=myname;
mode=mod;
hostip=InetAddress.getByName(ip);
roomname=room;
setLayout(null);
setSize(400,460);
lbl_ipNroomName = new JLabel("",SwingConstants.CENTER);
txt_mymsg = new JTextField();
btn_send = new JButton("Send");
jScrollPane1 = new JScrollPane();
jTextArea1 = new JTextArea(8,15);
ClientList=new ArrayList<>();
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
add(lbl_ipNroomName);
lbl_ipNroomName.setBounds(10,10,getWidth()-30,40);
add(txt_mymsg);
pt=this;
txt_mymsg.setBounds(10,lbl_ipNroomName.getY()+lbl_ipNroomName.getHeight(),getWidth()-130,30);
add(btn_send);
btn_send.setBounds(txt_mymsg.getWidth()+20,txt_mymsg.getY(),80,30);
jScrollPane1.setViewportView(jTextArea1);
add(jScrollPane1);
jScrollPane1.setBounds(10,btn_send.getY()+40,lbl_ipNroomName.getWidth(),getHeight()-20-jScrollPane1.getY()-110);
btn_send.setEnabled(false);
jTextArea1.setEditable(false);
txt_mymsg.setEnabled(false);
btn_send.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String s=txt_mymsg.getText();
if(s.equals("")==false)
{
if(mode==HOST_MODE)
broadcast(Name+": "+s);
else
sendToHost(Name+": "+s);
txt_mymsg.setText("");
}
}
});
if(mode==HOST_MODE)
{
socket=new DatagramSocket(37988);
lbl_ipNroomName.setText("My IP:"+InetAddress.getLocalHost().getHostAddress());
}
else
{
socket=new DatagramSocket();
String reqresp="!!^^"+Name+"^^!!";
DatagramPacket pk=new DatagramPacket(reqresp.getBytes(),reqresp.length(),hostip,37988);
socket.send(pk);
b=new byte[300];
pk=new DatagramPacket(b,300);
socket.setSoTimeout(6000);
socket.receive(pk);
reqresp=new String(pk.getData());
if(reqresp.contains("!!^^"))
{
roomname=reqresp.substring(4,reqresp.indexOf("^^!!"));
lbl_ipNroomName.setText("ChatRoom: "+roomname);
btn_send.setEnabled(true);
txt_mymsg.setEnabled(true);
}
else{
JOptionPane.showMessageDialog(pt,"No response from the server");System.exit(0);
}
}
Messenger.start();
}catch(Exception ex){JOptionPane.showMessageDialog(null,ex);}
}
public static void main(String args[]) {
try {
String host="",room="";
String name=JOptionPane.showInputDialog("Enter Your Name");
if(name==null||name.equals(""))
{JOptionPane.showMessageDialog(null, "Name cannot be blank");return;}
int mode=JOptionPane.showConfirmDialog(null,"Create a chatroom or connect to existing one?\nYes - Create Chat Room\nNo - Jion a Chat Room","Create or Join?",JOptionPane.YES_NO_OPTION);
if(mode==1)
{
host=JOptionPane.showInputDialog("Enter the host ip address");
if(host==null||host.equals(""))
{JOptionPane.showMessageDialog(null, "IP of host is mandatory");return;}
}
else
room=JOptionPane.showInputDialog("Name your chat room");
ChatRoom obj= new ChatRoom(name,mode,host,room);
obj.setVisible(true);
} catch (Exception ex) {JOptionPane.showMessageDialog(null,ex);}
}
public void broadcast(String str)
{
try {
DatagramPacket pack=new DatagramPacket(str.getBytes(),str.length());
for(int i=0;i<ClientList.size();i++)
{
pack.setAddress(InetAddress.getByName(ClientList.get(i).ip));
pack.setPort(ClientList.get(i).port);
socket.send(pack);
}
jTextArea1.setText(jTextArea1.getText()+"\n"+str);
} catch (Exception ex) {JOptionPane.showMessageDialog(pt,ex);}
}
public void sendToHost(String str)
{
DatagramPacket pack=new DatagramPacket(str.getBytes(),str.length(),hostip,37988);
try {socket.send(pack);} catch (Exception ex)
{JOptionPane.showMessageDialog(pt,"Sending to server failed");}
}
Thread Messenger=new Thread()
{
public void run()
{
try {
while(true)
{
b=new byte[300];
DatagramPacket pkt=new DatagramPacket(b,300);
socket.setSoTimeout(0);
socket.receive(pkt);
String s=new String(pkt.getData());
if(mode==HOST_MODE)
{
if(s.contains("!!^^"))
{
client temp=new client();
temp.ip=pkt.getAddress().getHostAddress();
temp.port=pkt.getPort();
broadcast(s.substring(4,s.indexOf("^^!!"))+" joined.");
ClientList.add(temp);
s="!!^^"+roomname+"^^!!";
pkt=new DatagramPacket(s.getBytes(),s.length(),InetAddress.getByName(temp.ip),temp.port);
socket.send(pkt);
btn_send.setEnabled(true);
txt_mymsg.setEnabled(true);
}
else
{
broadcast(s);
}
}
else
{
jTextArea1.setText(jTextArea1.getText()+"\n"+s);
}
}
}catch (IOException ex) {JOptionPane.showMessageDialog(pt,ex);System.exit(0);}
}
};
}
class client
{
public String ip;
public int port;
public String name;
}
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