content: package act.util;
  
  /*-
   * #%L
   * ACT Framework
   * %%
   * Copyright (C) 2014 - 2017 ActFramework
   * %%
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   * 
   *      http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   * #L%
   */
  
  import java.net.InetAddress;
  import java.net.NetworkInterface;
  import java.net.SocketException;
  import java.util.Enumeration;
  import java.util.HashSet;
  import java.util.Set;
  
  /**
   * Credential: source code copied from https://gist.github.com/pfmiles/9f7273b12b4b486e2e9c
   */
  class LocalIpAddressUtil {
      /**
       * 获取本地ip地址，有可能会有多个地址, 若有多个网卡则会搜集多个网卡的ip地址
       */
      public static Set<InetAddress> resolveLocalAddresses() {
          Set<InetAddress> addrs = new HashSet<InetAddress>();
          Enumeration<NetworkInterface> ns = null;
          try {
              ns = NetworkInterface.getNetworkInterfaces();
          } catch (SocketException e) {
              // ignored...
          }
          while (ns != null && ns.hasMoreElements()) {
              NetworkInterface n = ns.nextElement();
              Enumeration<InetAddress> is = n.getInetAddresses();
              while (is.hasMoreElements()) {
                  InetAddress i = is.nextElement();
                  if (!i.isLoopbackAddress() && !i.isLinkLocalAddress() && !i.isMulticastAddress()
                          && !isSpecialIp(i.getHostAddress())) addrs.add(i);
              }
          }
          return addrs;
      }
  
      public static Set<String> resolveLocalIps() {
          Set<InetAddress> addrs = resolveLocalAddresses();
          Set<String> ret = new HashSet<String>();
          for (InetAddress addr : addrs)
              ret.add(addr.getHostAddress());
          return ret;
      }
  
      /**
       * 取得当前机器的address信息，若有多个则随机选一个
       */
      public static InetAddress resolveLocalAddress() {
          Set<InetAddress> addrs = resolveLocalAddresses();
          if (addrs != null && !addrs.isEmpty()) return addrs.iterator().next();
          return null;
      }
  
      public static String ip() {
          InetAddress addr = resolveLocalAddress();
          if (null == addr) {
              // you are running the app in a host without network connection
              return "127.0.0.1";
          }
          return addr.getHostAddress();
      }
  
      private static boolean isSpecialIp(String ip) {
          if (ip.contains(":")) return true;
          if (ip.startsWith("127.")) return true;
          if (ip.startsWith("169.254.")) return true;
          if (ip.equals("255.255.255.255")) return true;
          return false;
      }
  
  }
  