com.litongjava.tio.utils.network.IpUtils Maven / Gradle / Ivy

package com.litongjava.tio.utils.network;

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

/**
 *
 * @author tanyaowu
 * 2017年8月10日 下午5:05:49
 */
public class IpUtils {

  /**
   * 获取本机 ip
   * @return 本机IP
   */
  public static String getLocalIp(){
    String localip = null; // 本地IP，如果没有配置外网IP则返回
    String netip = null; // 外网IP

    Enumeration netInterfaces;
    try {
      netInterfaces = NetworkInterface.getNetworkInterfaces();
    } catch (SocketException e) {
      throw new RuntimeException(e);
    }
    InetAddress ip = null;
    boolean finded = false; // 是否找到外网IP
    while (netInterfaces.hasMoreElements() && !finded) {
      NetworkInterface ni = netInterfaces.nextElement();
      Enumeration address = ni.getInetAddresses();
      while (address.hasMoreElements()) {
        ip = address.nextElement();
        if (!ip.isSiteLocalAddress() && !ip.isLoopbackAddress() && ip.getHostAddress().indexOf(":") == -1) {// 外网IP
          netip = ip.getHostAddress();
          finded = true;
          break;
        } else if (ip.isSiteLocalAddress() && !ip.isLoopbackAddress() && ip.getHostAddress().indexOf(":") == -1) {// 内网IP
          localip = ip.getHostAddress();
        }
      }
    }

    if (netip != null && !"".equals(netip)) {
      return netip;
    } else {
      return localip;
    }
  }

}