Java里面获取当前服务器(linux环境)的IP地址--与请求者的真实IP

 package com.wfd360.Util;

 import javax.servlet.http.HttpServletRequest;
 import java.net.Inet4Address;
 import java.net.InetAddress;
 import java.net.NetworkInterface;
 import java.net.SocketException;
 import java.util.Enumeration;
 import java.util.HashMap;
 import java.util.Map;

 /**
  * @Copyright (C)
  * @Author: 姿势帝
  * @Date: 6/3 16:37
  * @Description:
  */
 public class HostUtil {
     private static String ipstr = "127.0.0.1";
     private static Map<String, String> map = new HashMap();

     static {
         map.put("ip", getLinuxLocalIp());
     }

     public static String getHostIp() {
         String ip = map.get("ip");
         if (ip == null) {
             String ip1 = getLinuxLocalIp();
             map.put("ip", ip1);
             return ip1;
         }
         return ip;
     }

     /**
      * 获取Linux下的IP地址
      *
      * @return IP地址
      * @throws SocketException
      */
     private static String getLinuxLocalIp() {
         String ip = "";
         try {
             for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements(); ) {
                 NetworkInterface intf = en.nextElement();
                 String name = intf.getName();
                 if (!name.contains("docker") && !name.contains("lo")) {
                     for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements(); ) {
                         InetAddress inetAddress = enumIpAddr.nextElement();
                         if (!inetAddress.isLoopbackAddress()) {
                             String ipaddress = inetAddress.getHostAddress().toString();
                             if (!ipaddress.contains("::") && !ipaddress.contains("0:0:") && !ipaddress.contains("fe80")) {
                                 ip = ipaddress;
                             }
                         }
                     }
                 }
             }
         } catch (SocketException ex) {
             ip = "127.0.0.1";
             ex.printStackTrace();
         }
         return ip;
     }

     /**
      * 获取请求者的ip地址
      *
      * @param request
      * @return
      */
     public static String getIpAdrress(HttpServletRequest request) {
         String ip = null;

         //X-Forwarded-For：Squid 服务代理
         String ipAddresses = request.getHeader("X-Forwarded-For");
         String unknown = "unknown";
         if (ipAddresses == null || ipAddresses.length() == 0 || unknown.equalsIgnoreCase(ipAddresses)) {
             //Proxy-Client-IP：apache 服务代理
             ipAddresses = request.getHeader("Proxy-Client-IP");
         }

         if (ipAddresses == null || ipAddresses.length() == 0 || unknown.equalsIgnoreCase(ipAddresses)) {
             //WL-Proxy-Client-IP：weblogic 服务代理
             ipAddresses = request.getHeader("WL-Proxy-Client-IP");
         }

         if (ipAddresses == null || ipAddresses.length() == 0 || unknown.equalsIgnoreCase(ipAddresses)) {
             //HTTP_CLIENT_IP：有些代理服务器
             ipAddresses = request.getHeader("HTTP_CLIENT_IP");
         }

         if (ipAddresses == null || ipAddresses.length() == 0 || unknown.equalsIgnoreCase(ipAddresses)) {
             //X-Real-IP：nginx服务代理
             ipAddresses = request.getHeader("X-Real-IP");
         }

         //有些网络通过多层代理，那么获取到的ip就会有多个，一般都是通过逗号（,）分割开来，并且第一个ip为客户端的真实IP
         if (ipAddresses != null && ipAddresses.length() != 0) {
             ip = ipAddresses.split(",")[0];
         }

         //还是不能获取到，最后再通过request.getRemoteAddr();获取
         if (ip == null || ip.length() == 0 || unknown.equalsIgnoreCase(ipAddresses)) {
             ip = request.getRemoteAddr();
         }
         return ip;
     }

 }