参考：https://www.jb51.net/article/243543.htm

    1. package com.tj.demo.utils;
    3. import org.apache.commons.lang.StringUtils;
    5. import javax.servlet.http.HttpServletRequest;
    7. public class TjIpUtils {
    9.     /***
    10.      * 获取客户端ip地址
    11.      * @param request
    12.      */
    13.     public static String getIP(final HttpServletRequest request) throws Exception {
    14.         if (request == null) {
    15.             throw (new Exception("getIpAddr method HttpServletRequest Object is null"));
    16.         }
    17.         String ipStr = request.getHeader("x-forwarded-for");
    18.         if (StringUtils.isBlank(ipStr) || "unknown".equalsIgnoreCase(ipStr)) {
    19.             ipStr = request.getHeader("Proxy-Client-IP");
    20.         }
    21.         if (StringUtils.isBlank(ipStr) || "unknown".equalsIgnoreCase(ipStr)) {
    22.             ipStr = request.getHeader("WL-Proxy-Client-IP");
    23.         }
    24.         if (StringUtils.isBlank(ipStr) || "unknown".equalsIgnoreCase(ipStr)) {
    25.             ipStr = request.getRemoteAddr();
    26.         }
    28.         // 多个路由时，取第一个非unknown的ip
    29.         final String[] arr = ipStr.split(",");
    30.         for (final String str : arr) {
    31.             if (!"unknown".equalsIgnoreCase(str)) {
    32.                 ipStr = str;
    33.                 break;
    34.             }
    35.         }
    36.         //目的是将localhost访问对应的ip 0:0:0:0:0:0:0:1 转成 127.0.0.1。
    37.         return ipStr.equals("0:0:0:0:0:0:0:1") ? "127.0.0.1" : ipStr;
    38.     }
    39. }