Java IP Address Get getIP()

Description

get IP

License

Apache License

Declaration

public static byte[] getIP() 

Method Source Code

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

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;

import java.util.Enumeration;

public class Main {
    public static byte[] getIP() {
        try {/*from www  . j  a  va 2  s. com*/
            Enumeration allNetInterfaces = NetworkInterface.getNetworkInterfaces();
            InetAddress ip = null;
            byte[] internalIP = null;
            while (allNetInterfaces.hasMoreElements()) {
                NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();
                Enumeration addresses = netInterface.getInetAddresses();
                while (addresses.hasMoreElements()) {
                    ip = (InetAddress) addresses.nextElement();
                    if (ip != null && ip instanceof Inet4Address) {
                        byte[] ipByte = ip.getAddress();
                        if (ipByte.length == 4) {
                            if (ipCheck(ipByte)) {
                                if (!isInternalIP(ipByte)) {
                                    return ipByte;
                                } else if (internalIP == null) {
                                    internalIP = ipByte;
                                }
                            }
                        }
                    }
                }
            }
            if (internalIP != null) {
                return internalIP;
            } else {
                throw new RuntimeException("Can not get local ip");
            }
        } catch (Exception e) {
            throw new RuntimeException("Can not get local ip", e);
        }
    }

    private static boolean ipCheck(byte[] ip) {
        if (ip.length != 4) {
            throw new RuntimeException("illegal ipv4 bytes");
        }

        //        if (ip[0] == (byte)30 && ip[1] == (byte)10 && ip[2] == (byte)163 && ip[3] == (byte)120) {
        //        }

        if (ip[0] >= (byte) 1 && ip[0] <= (byte) 126) {
            if (ip[1] == (byte) 1 && ip[2] == (byte) 1 && ip[3] == (byte) 1) {
                return false;
            }
            if (ip[1] == (byte) 0 && ip[2] == (byte) 0 && ip[3] == (byte) 0) {
                return false;
            }
            return true;
        } else if (ip[0] >= (byte) 128 && ip[0] <= (byte) 191) {
            if (ip[2] == (byte) 1 && ip[3] == (byte) 1) {
                return false;
            }
            if (ip[2] == (byte) 0 && ip[3] == (byte) 0) {
                return false;
            }
            return true;
        } else if (ip[0] >= (byte) 192 && ip[0] <= (byte) 223) {
            if (ip[3] == (byte) 1) {
                return false;
            }
            if (ip[3] == (byte) 0) {
                return false;
            }
            return true;
        }
        return false;
    }

    public static boolean isInternalIP(byte[] ip) {
        if (ip.length != 4) {
            throw new RuntimeException("illegal ipv4 bytes");
        }

        //10.0.0.0~10.255.255.255
        //172.16.0.0~172.31.255.255
        //192.168.0.0~192.168.255.255
        if (ip[0] == (byte) 10) {

            return true;
        } else if (ip[0] == (byte) 172) {
            if (ip[1] >= (byte) 16 && ip[1] <= (byte) 31) {
                return true;
            }
        } else if (ip[0] == (byte) 192) {
            if (ip[1] == (byte) 168) {
                return true;
            }
        }
        return false;
    }
}

Related

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