Java IP Address Get getIP()

Description

Get an IP.

License

Creative Commons License

Exception

Parameter	Description
SocketException	an exception

Declaration

public static InetAddress getIP() throws SocketException 

Method Source Code

//package com.java2s;
/*/*from ww w.j a  v a2  s  . c  o  m*/
 * This work is licensed under the Creative Commons Attribution 3.0 Unported
 * License. To view a copy of this license, visit
 * http://creativecommons.org/licenses/by/3.0/ or send a letter to Creative
 * Commons, 171 Second Street, Suite 300, San Francisco, California, 94105, USA.
 */

import java.net.InetAddress;
import java.net.InterfaceAddress;
import java.net.NetworkInterface;
import java.net.SocketException;

import java.util.Enumeration;

public class Main {
    private static InetAddress _ip;

    /**
     * Get an IP.
     *
     * @return
     * @throws SocketException
     */
    public static InetAddress getIP() throws SocketException {
        if (_ip != null) {
            return _ip;
        }

        Enumeration<NetworkInterface> nis = NetworkInterface.getNetworkInterfaces();
        NetworkInterface ni;
        while (nis.hasMoreElements()) {
            ni = nis.nextElement();
            if (!ni.isLoopback()/*not loopback*/ && ni.isUp()/*it works now*/) {
                for (InterfaceAddress ia : ni.getInterfaceAddresses()) {
                    //filter for ipv4/ipv6
                    if (ia.getAddress().getAddress().length == 4) {
                        //4 for ipv4, 16 for ipv6
                        _ip = ia.getAddress();
                        return _ip;
                    }
                }
            }
        }
        return null;
    }
}

Related

1. getInternalIp()
2. getInternalIp()
3. getInternetIpAddress()
4. getIntfFromLabelAdva(int n, Inet4Address ip)
5. getIntranetIp()
6. getIp()
7. getIP()
8. getIp()
9. getIp()