Java programming to achieve the server IP address and MAC address method

This article illustrates how to obtain the server IP address and MAC address by Java programming. Share with you for your reference, as follows:

Tested system:
Windows, Linux Unix

Exclude abnormal IP such as 127.0.0.1 and 0.0.0.0.1

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
public class IpUtil {
 private IpUtil(){}
 
 public static String getLocalIP() {
  String sIP = "";
  InetAddress ip = null;
  try {
   boolean bFindIP = false;
   Enumeration<NetworkInterface> netInterfaces = (Enumeration<NetworkInterface>) NetworkInterface
     .getNetworkInterfaces();
   while (netInterfaces.hasMoreElements()) {
    if (bFindIP) {
     break;
    }
    NetworkInterface ni = (NetworkInterface) netInterfaces
      .nextElement();
    Enumeration<InetAddress> ips = ni.getInetAddresses();
    while (ips.hasMoreElements()) {
     ip = (InetAddress) ips.nextElement();
     if (!ip.isLoopbackAddress() 
       && ip.getHostAddress().matches(
         "(\d{1,3}\.){3}\d{1,3}")) {
      bFindIP = true;
      break;
     }
    }
   }
  } catch (Exception e) {
   OutUtil.error(IpUtil.class, e.getMessage());
  }
  if (null != ip) {
   sIP = ip.getHostAddress();
  }
  return sIP;
 }
 
 public static List<String> getLocalIPS() {
  InetAddress ip = null;
  List<String> ipList = new ArrayList<String>();
  try {
   Enumeration<NetworkInterface> netInterfaces = (Enumeration<NetworkInterface>) NetworkInterface
     .getNetworkInterfaces();
   while (netInterfaces.hasMoreElements()) {
    NetworkInterface ni = (NetworkInterface) netInterfaces
      .nextElement();
    Enumeration<InetAddress> ips = ni.getInetAddresses();
    while (ips.hasMoreElements()) {
     ip = (InetAddress) ips.nextElement();
     if (!ip.isLoopbackAddress() 
       && ip.getHostAddress().matches(
         "(\d{1,3}\.){3}\d{1,3}")) {
      ipList.add(ip.getHostAddress());
     }
    }
   }
  } catch (Exception e) {
   OutUtil.error(IpUtil.class, e.getMessage());
  }
  return ipList;
 }
 
 public static String getMacId() {
  String macId = "";
  InetAddress ip = null;
  NetworkInterface ni = null;
  try {
   boolean bFindIP = false;
   Enumeration<NetworkInterface> netInterfaces = (Enumeration<NetworkInterface>) NetworkInterface
     .getNetworkInterfaces();
   while (netInterfaces.hasMoreElements()) {
    if (bFindIP) {
     break;
    }
    ni = (NetworkInterface) netInterfaces
      .nextElement();
    //-- specific case, you can consider using ni.getname judgment
    //Iterate over all ips
    Enumeration<InetAddress> ips = ni.getInetAddresses();
    while (ips.hasMoreElements()) {
     ip = (InetAddress) ips.nextElement();
     if (!ip.isLoopbackAddress() //The 127.0.0.1
       && ip.getHostAddress().matches(
         "(\d{1,3}\.){3}\d{1,3}")) {
      bFindIP = true;
      break;
     }
    }
   }
  } catch (Exception e) {
   OutUtil.error(IpUtil.class, e.getMessage());
  }
  if (null != ip) {
   try {
    macId = getMacFromBytes(ni.getHardwareAddress());
   } catch (SocketException e) {
    OutUtil.error(IpUtil.class, e.getMessage());
   }
  }
  return macId;
 }
 
 public static List<String> getMacIds() {
  InetAddress ip = null;
  NetworkInterface ni = null;
  List<String> macList = new ArrayList<String>();
  try {
   Enumeration<NetworkInterface> netInterfaces = (Enumeration<NetworkInterface>) NetworkInterface
     .getNetworkInterfaces();
   while (netInterfaces.hasMoreElements()) {
    ni = (NetworkInterface) netInterfaces
      .nextElement();
    //-- specific case, you can consider using ni.getname judgment
    //Iterate over all ips
    Enumeration<InetAddress> ips = ni.getInetAddresses();
    while (ips.hasMoreElements()) {
     ip = (InetAddress) ips.nextElement();
     if (!ip.isLoopbackAddress() //The 127.0.0.1
       && ip.getHostAddress().matches(
         "(\d{1,3}\.){3}\d{1,3}")) {
      macList.add(getMacFromBytes(ni.getHardwareAddress()));
     }
    }
   }
  } catch (Exception e) {
   OutUtil.error(IpUtil.class, e.getMessage());
  }
  return macList;
 }
 private static String getMacFromBytes(byte[] bytes) {
  StringBuffer mac = new StringBuffer();
  byte currentByte;
  boolean first = false;
  for (byte b : bytes) {
   if (first) {
    mac.append("-");
   }
   currentByte = (byte) ((b & 240) >> 4);
   mac.append(Integer.toHexString(currentByte));
   currentByte = (byte) (b & 15);
   mac.append(Integer.toHexString(currentByte));
   first = true;
  }
  return mac.toString().toUpperCase();
 }
}

I hope this article has been helpful to you in Java programming.