Source Code : Finds a local, non-loopback, IPv4 address

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Finds a local, non-loopback, IPv4 address

      

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

public class Util{

  /**
   * Finds a local, non-loopback, IPv4 address
   * 
   * @return The first non-loopback IPv4 address found, or
   *         <code>null</code> if no such addresses found
   * @throws SocketException
   *            If there was a problem querying the network
   *            interfaces
   */
  public static InetAddress getLocalAddress() throws SocketException
  {
    Enumeration<NetworkInterface> ifaces = NetworkInterface.getNetworkInterfaces();
    while( ifaces.hasMoreElements() )
    {
      NetworkInterface iface = ifaces.nextElement();
      Enumeration<InetAddress> addresses = iface.getInetAddresses();

      while( addresses.hasMoreElements() )
      {
        InetAddress addr = addresses.nextElement();
        if( addr instanceof Inet4Address && !addr.isLoopbackAddress() )
        {
          return addr;
        }
      }
    }

    return null;
  }

}

   
    
    
    
    
    
  

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