public class IpUtil {
    public static String getIpAddr(ServerHttpRequest request) {
        HttpHeaders headers = request.getHeaders();
        String ipAddress = headers.getFirst("X-Forwarded-For");
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = headers.getFirst("Proxy-Client-IP");
        }
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = headers.getFirst("WL-Proxy-Client-IP");
        }
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getRemoteAddress().getAddress().getHostAddress();
            if (ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")) {
                // 根據(jù)網(wǎng)卡取本機(jī)配置的IP
                try {
                    InetAddress inet = InetAddress.getLocalHost();
                    ipAddress = inet.getHostAddress();
                } catch (UnknownHostException e) {
                    log.error("根據(jù)網(wǎng)卡獲取本機(jī)配置的IP異常", e);
                }
            }
        }
        // 對(duì)于通過多個(gè)代理的情況，第一個(gè)IP為客戶端真實(shí)IP，多個(gè)IP按照','分割
        if (ipAddress != null && ipAddress.indexOf(",") > 0) {
            ipAddress = ipAddress.split(",")[0];
        }
        return ipAddress;
    }
}

<dependency>
    <groupId>org.lionsoul</groupId>
    <artifactId>ip2region</artifactId>
    <version>1.7.2</version>
</dependency>

static {
    dbPath = createFtlFileByFtlArray() + "ip2region.db";
    try {
        config = new DbConfig();
    } catch (DbMakerConfigException e) {
        e.printStackTrace();
    }
    try {
        searcher = new DbSearcher(config, dbPath);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }
}

    public static String getCityInfo(String ip) {
        if (StringUtils.isEmpty(dbPath)) {
            log.error("Error: Invalid ip2region.db file");
            return null;
        }
        if(config == null || searcher == null){
            log.error("Error: DbSearcher or DbConfig is null");
            return null;
        }
        //查詢算法
        //B-tree, B樹搜索（更快）
        int algorithm = DbSearcher.BTREE_ALGORITHM;
        //Binary,使用二分搜索
        //DbSearcher.BINARY_ALGORITHM
        //Memory,加載內(nèi)存（最快）
        //DbSearcher.MEMORY_ALGORITYM
        try {
            // 使用靜態(tài)代碼塊，減少文件讀取操作
//            DbConfig config = new DbConfig();
//            DbSearcher searcher = new DbSearcher(config, dbPath);
            //define the method
            Method method = null;
            switch (algorithm) {
                case DbSearcher.BTREE_ALGORITHM:
                    method = searcher.getClass().getMethod("btreeSearch", String.class);
                    break;
                case DbSearcher.BINARY_ALGORITHM:
                    method = searcher.getClass().getMethod("binarySearch", String.class);
                    break;
                case DbSearcher.MEMORY_ALGORITYM:
                    method = searcher.getClass().getMethod("memorySearch", String.class);
                    break;
                default:
            }
            DataBlock dataBlock = null;
            if (Util.isIpAddress(ip) == false) {
                System.out.println("Error: Invalid ip address");
            }
            dataBlock = (DataBlock) method.invoke(searcher, ip);
            String ipInfo = dataBlock.getRegion();
            if (!StringUtils.isEmpty(ipInfo)) {
                ipInfo = ipInfo.replace("|0", "");
                ipInfo = ipInfo.replace("0|", "");
            }
            return ipInfo;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

/**
 * 獲取IP屬地
 * @param ip
 * @return
 */
public static String getIpPossession(String ip) {
    String cityInfo = getCityInfo(ip);
    if (!StringUtils.isEmpty(cityInfo)) {
        cityInfo = cityInfo.replace("|", " ");
        String[] cityList = cityInfo.split(" ");
        if (cityList.length > 0) {
            // 國(guó)內(nèi)的顯示到具體的省
            if ("中國(guó)".equals(cityList[0])) {
                if (cityList.length > 1) {
                    return cityList[1];
                }
            }
            // 國(guó)外顯示到國(guó)家
            return cityList[0];
        }
    }
    return "未知";
}