<!-- https://mvnrepository.com/artifact/org.lionsoul/ip2region -->
        <dependency>
            <groupId>org.lionsoul</groupId>
            <artifactId>ip2region</artifactId>
            <version>2.7.0</version>
        </dependency>

地址：https://gitcode.com/lionsoul2014/ip2region/overview

将数据文件下载下来放到resources：

public class IPUtil {

    /**
     * 将整个xdb文件加载到内存中
     */
    private final static Searcher SEARCHER;

    static {
        try {
            ClassPathResource resource = new ClassPathResource("ip2region.xdb");
            String path = resource.getURL().getPath();
            byte[] cBuff = Searcher.loadContentFromFile(path);
            SEARCHER = Searcher.newWithBuffer(cBuff);
        } catch (Exception e) {
            throw new RuntimeException("初始化ip2region.xdb异常!");
        }
    }

    /**
     * @Description 获取ip地址信息
      * @param ipStr 192.168.0.1
     * @Throws 
     * @Return java.util.List<java.lang.String>  返回结果形式(国家|区域|省份|城市|ISP)
     * @Date 2024-03-08 17:43:45
     * @Author WangKun
     */
    public static List<String> getIpAddress(String ipStr) {
        return getIpAddress(ipStr, null);
    }


    /**
     * @Description 获取ip地址信息
      * @param ipStr ip 经过转换后的
     * @param index 
     * @Throws
     * @Return java.util.List<java.lang.String> 
     * @Date 2024-03-08 17:43:51
     * @Author WangKun
     */
    public static List<String> getIpAddress(String ipStr, int[] index) {
        try {
            long ip = Searcher.checkIP(ipStr);
            return getIpAddress(ip, index);
        } catch (Exception e) {
            throw new RuntimeException("ip解析为long系统异常!");
        }
    }

    /**
     * @Description 获取ip地址信息
      * @param ip
     * @param index
     * @Throws 
     * @Return java.util.List<java.lang.String> 
     * @Date 2024-03-08 17:43:55
     * @Author WangKun
     */
    public static List<String> getIpAddress(Long ip, int[] index) {
        //获取xdb文件资源
        List<String> regionList = new ArrayList<>();
        try {
            String region = SEARCHER.search(ip);
            String[] split = region.split("\\|");
            if (index == null) {
                regionList = Arrays.asList(split);
            } else {
                for (int i : index) {
                    regionList.add(split[i]);
                }
            }
            //关闭资源
            SEARCHER.close();
        } catch (Exception e) {
            throw new RuntimeException("ip解析地址异常!");
        }
        return regionList;
    }


}