离线版本：

依赖：

maven

<dependency><groupId>org.lionsoul</groupId><artifactId>ip2region</artifactId><version>1.7</version>
</dependency>

gradle

    implementation 'org.lionsoul:ip2region:2.7.0'

dome:

注：ip2region.xdb 离线版本库  

链接：https://pan.baidu.com/s/1yEQXrEsfi-RFOAd1fK1bdw?pwd=n6nn 

import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.annotation.*;
import org.lionsoul.ip2region.xdb.Searcher;
import org.springframework.core.io.ClassPathResource;
import org.springframework.util.FileCopyUtils;
import java.io.InputStream;public static void main(String[] args) throws Exception {// 1、创建 searcher 对象String dbPath = "/ip2region/ip2region.xdb";Searcher searcher = null;try {InputStream inputStream = new ClassPathResource(dbPath).getInputStream();byte[] dbBinStr = FileCopyUtils.copyToByteArray(inputStream);// 创建一个完全基于内存的查询对象searcher = Searcher.newWithBuffer(dbBinStr);} catch (Exception e) {System.out.printf("failed to create content cached searcher: %s\n", e);}//把ip2rString address = "";try {address = searcher.search("66.249.79.193");} catch (Exception e) {throw new RuntimeException(e);}System.out.println("=== 访问者的地址为："+address+" === ");// 3、关闭资源searcher.close();// 备注：并发使用，每个线程需要创建一个独立的 searcher 对象单独使用。}

结果：

 

在线版本：

public static String getAddress(String ip) {try {URL realUrl = new URL("http://whois.pconline.com.cn/ipJson.jsp?ip=" + ip + "&json=true");HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();conn.setRequestMethod("GET");conn.setUseCaches(false);conn.setReadTimeout(6000);conn.setConnectTimeout(6000);conn.setInstanceFollowRedirects(false);int code = conn.getResponseCode();StringBuilder sb = new StringBuilder();String ipaddr = "";if (code == 200) {InputStream in = conn.getInputStream();BufferedReader reader = new BufferedReader(new InputStreamReader(in));String line;while ((line = reader.readLine()) != null) {sb.append(line);}ipaddr = ip + "=" + sb.substring(sb.indexOf("addr") + 7, sb.indexOf("regionNames") - 3);}return ipaddr;} catch (Exception e) {e.printStackTrace();return null;}
}