Java如何根据根据IP地址获取省市

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

public class IPUtil {

    /**
     * 获取IP地址
     * @param request
     * @return
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("X-Real-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        if ("0:0:0:0:0:0:0:1".equals(ip)) {
            ip = "127.0.0.1";
        }
        if (ip.split(",").length > 1) {
            ip = ip.split(",")[0];
        }
        return ip;
    }

    /**
     * 根据IP地址获取城市
     * @param ip
     * @return
     */
    public static String getCityInfo(String ip) throws IOException {
        URL url = IPUtil.class.getResource("/ip2region.db");
        File file;
        file = new File("/app/project/croot_rims/package/webserver/ip2region.db");
        if (!file.exists()) {
            System.out.println("Error: Invalid ip2region.db file, filePath：" + file.getPath());
            return null;
        }
        //查询算法
        int algorithm = DbSearcher.BTREE_ALGORITHM; //B-tree
        //DbSearcher.BINARY_ALGORITHM //Binary
        //DbSearcher.MEMORY_ALGORITYM //Memory
        try {
            DbConfig config = new DbConfig();
            DbSearcher searcher = new DbSearcher(config, file.getPath());
            Method method;
            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:
                    return null;
            }
            DataBlock dataBlock;
            if (!Util.isIpAddress(ip)) {
                System.out.println("Error: Invalid ip address");
                return null;
            }
            dataBlock  = (DataBlock) method.invoke(searcher, ip);
            return dataBlock.getRegion();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

}

String detail = IpUtils.getCityInfo("113.115.178.39");

public class GeoIPTest {  
    public static void main(String[] args) throws IOException, GeoIp2Exception {  
        String ipAddress = "你的IP地址";  // 替换成你要查询的IP地址  
        File database = new File("你的数据库文件路径"); // 替换成你的GeoLite数据库文件路径  
        DatabaseReader dbReader = new DatabaseReader.Builder(database).build();  
        InetAddress ip = InetAddress.getByName(ipAddress);  
        CityResponse response = dbReader.city(ip);  
        City city = response.getCity();  
        System.out.println(city.getName());  // 输出城市名  
    }  
}

<dependency>  
    <groupId>com.maxmind.geoip2</groupId>  
    <artifactId>geoip2</artifactId>  
    <version>2.12.0</version>  <!-- 请检查最新版本 -->  
</dependency>