Java IP Address Get getLocalIP()

Description

get Local IP

License

Apache License

Declaration

public static String getLocalIP() throws Exception 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.net.*;

import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

public class Main {
    public static String EXCLUDE_IP = "10.";
    public static String NET_INTERFACE;

    public static List<String> getLocalIP(String nic, String exclude) throws Exception {
        List<String> result = new ArrayList<String>();
        NetworkInterface ni;//from w  ww .  ja  va2 s.  c o  m
        Enumeration<InetAddress> ias;
        InetAddress address;
        String ip;
        Enumeration<NetworkInterface> netInterfaces = NetworkInterface.getNetworkInterfaces();
        while (netInterfaces.hasMoreElements()) {
            ni = netInterfaces.nextElement();
            if (nic != null && !nic.isEmpty() && !ni.getName().equals(nic)) {
                continue;
            }
            ias = ni.getInetAddresses();
            while (ias.hasMoreElements()) {
                address = ias.nextElement();
                if (!address.isLoopbackAddress() && (address instanceof Inet4Address)) {
                    ip = address.getHostAddress();
                    result.add(ip);
                }
            }
        }

        int count = result.size();
        if (count <= 1) {
            return result;
        }
        if (exclude != null && !exclude.isEmpty()) {
            for (int i = count - 1; i >= 0; i--) {
                ip = result.get(i);
                if (ip.startsWith(exclude)) {
                    result.remove(i);
                    count--;
                    if (count == 1) {
                        break;
                    }
                }
            }
        }

        return result;
    }

    public static String getLocalIP(final String exclude) throws Exception {
        List<String> ips = getLocalIP(NET_INTERFACE, exclude);
        if (ips != null && !ips.isEmpty()) {
            if (ips.size() == 1) {
                return ips.get(0);
            }
            for (String ip : ips) {
                if (ip.startsWith("172.")) {
                    return ip;
                } else if (ip.startsWith("192.")) {
                    return ip;
                }
            }
            return ips.get(0);
        }
        return null;
    }

    public static String getLocalIP() throws Exception {
        return getLocalIP(EXCLUDE_IP);
    }
}

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