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IpUtil工具类如下：

package com.xiaobu.base.utils;import javax.servlet.http.HttpServletRequest;/** * @author xiaobu * @version JDK1.8.0_171 * @date on  2018/11/7 10:19 * @description V1.0 */public class IpUtils {    /**     * 获取访问用户的客户端IP（适用于公网与局域网）.     */    public static  String getIpAddr(final HttpServletRequest request)            throws Exception {        if (request == null) {            throw (new Exception("getIpAddr method HttpServletRequest Object is null"));        }        String ipString = request.getHeader("X-Real-IP");        if (isBlank(ipString) || "unknown".equalsIgnoreCase(ipString)) {             ipString = request.getHeader("X-Forwarded-For");        }        if (isBlank(ipString) || "unknown".equalsIgnoreCase(ipString)) {            ipString = request.getHeader("Proxy-Client-IP");        }        if (isBlank(ipString) || "unknown".equalsIgnoreCase(ipString)) {            ipString = request.getHeader("WL-Proxy-Client-IP");        }        if (isBlank(ipString) || "unknown".equalsIgnoreCase(ipString)) {            ipString = request.getHeader("X-Real-IP");        }        if (isBlank(ipString) || "unknown".equalsIgnoreCase(ipString)) {            ipString = request.getRemoteAddr();        }        // 多个路由时，取第一个非unknown的ip        final String[] arr = ipString.split(",");        for (final String str : arr) {            if (!"unknown".equalsIgnoreCase(str)) {                ipString = str;                break;            }        }        return ipString;    }    /***     * @author xiaobu     * @date 2018/11/7 10:41     * @param ip ip地址     * @return boolean     * @descprition  判断IP地址是否有效     * @version 1.0     */    public static boolean isBlank(String ip){        return ip == null || ip.trim().length() == 0;    }}

JS获取IP地址可以访问以下两个网站：

http://pv.sohu.com/cityjson?ie=utf-8http://ip.taobao.com/service/getIpInfo2.php?ip=myip

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