finding the number of computer connected in LAN

[sushil]

hi
I am facing problem will performing my project

problem :1) finding the number of computer connected in LAN via java

2)How to broadcast message to all computer connected in LAN

if anybody know the solution plz help me out

[Bluefox815]

By computer number, I assume you mean IP address.

When you receive a connection from a client using a java.net.Socket object, you can use the getInetAddress() method in Socket to get an InetAddress object and then the getAddress() method in InetAddress to get an array of bytes.

Example:

import java.net.*;

ServerSocket serverSocket;
Socket client;
byte[] address;

...

try {
    serverSocket = new ServerSocket(4444); // open a port for listening
    client = serverSocket.accept(); // listen on the specified port
    address = client.getInetAddress().getAddress();
} catch (IOException ioe) {
    System.out.println("Handle IOException here.");
}

This code snippet should give you a basic idea of how to get the IP address of a host once it has connected. I did leave out how to broadcast the message, though. If you posted some code then I might be able to help you a little more.