SpringBoot集成IP2Region实现获取IP地域信息

<dependency>
    <groupId>org.lionsoul</groupId>
    <artifactId>ip2region</artifactId>
    <version>3.3.6</version>
</dependency>

ip2region:
  db-path: ip2region_v4.xdb  # 可根据需要替换为 IPv6 文件路径
  version: IPv4

import org.lionsoul.ip2region.xdb.Searcher;
import org.lionsoul.ip2region.xdb.Version;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.stereotype.Service;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.concurrent.TimeUnit;

import javax.annotation.PostConstruct;


@Service
public class IpService {

    private Searcher searcher;

    // 从配置文件中加载数据库路径和版本
    @Value("${ip2region.db-path}")
    private String dbPath;

    @Value("${ip2region.version}")
    private String version;

    // 服务启动时初始化 Searcher
    @PostConstruct
    public void init() throws IOException {
        // 根据配置选择 IP 版本
        Version ipVersion = version.equalsIgnoreCase("IPv4") ? Version.IPv4 : Version.IPv6;

        try {
            // 使用 ClassPathResource 加载类路径中的数据库文件
            Resource resource = new ClassPathResource(dbPath);
            if (!resource.exists()) {
                throw new IOException("Unable to find " + dbPath + " in classpath");
            }

            // 获取文件的输入流
            InputStream inputStream = resource.getInputStream();

            // 将 InputStream 保存到临时文件
            Path tempFile = Files.createTempFile("ip2region", ".xdb");
            try (OutputStream out = new FileOutputStream(tempFile.toFile())) {
                byte[] buffer = new byte[1024];
                int bytesRead;
                while ((bytesRead = inputStream.read(buffer)) != -1) {
                    out.write(buffer, 0, bytesRead);
                }
            }

            // 使用临时文件创建 Searcher 对象
            searcher = Searcher.newWithFileOnly(ipVersion, tempFile.toString());

        } catch (IOException e) {
            System.out.printf("failed to create searcher with `%s`: %s\n", dbPath, e);
            throw new IOException("Failed to initialize IP2Region searcher", e);
        }
    }

    // 查询 IP 地理位置
    public String getCityInfo(String ip) {
        try {
            long sTime = System.nanoTime();
            String region = searcher.search(ip);  // 查询 IP 地址
            long cost = TimeUnit.NANOSECONDS.toMicros(System.nanoTime() - sTime);
            System.out.printf("{region: %s, ioCount: %d, took: %d μs}\n", region, searcher.getIOCount(), cost);
            return region;
        } catch (Exception e) {
            System.out.printf("failed to search(%s): %s\n", ip, e);
            return null;
        }
    }

    // 在 Spring Boot 中使用 @PreDestroy 优雅地关闭 searcher
    public void close() throws IOException {
        if (searcher != null) {
            searcher.close();
        }
    }
}

package com.example.ip2region.controller;

import com.example.ip2region.service.IpService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class IpController {

    private final IpService ipService;

    @Autowired
    public IpController(IpService ipService) {
        this.ipService = ipService;
    }

    // 查询 IP 地址的地理信息
    @GetMapping("/get-ip-location")
    public String getIpLocation(@RequestParam String ip) {
        return ipService.getCityInfo(ip);
    }
}

package com.donglin.service;

import jakarta.annotation.PostConstruct;
import org.lionsoul.ip2region.xdb.Searcher;
import org.lionsoul.ip2region.xdb.Version;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.concurrent.TimeUnit;

@Service
public class IpService {

    private Searcher searcher;

    @Value("${ip2region.db-path}")
    private String dbPath;

    @Value("${ip2region.version}")
    private String version;

    @PostConstruct
    public void init() throws IOException {
        Version ipVersion = version.equalsIgnoreCase("IPv4") ? Version.IPv4 : Version.IPv6;

        try {
            // ✅ 1. 从 classpath 读取 XDB 文件（无论打包与否都兼容）
            Resource resource = new ClassPathResource(dbPath);
            if (!resource.exists()) {
                throw new IOException("无法在 classpath 中找到文件：" + dbPath);
            }

            // ✅ 2. 先把 XDB 文件写入临时文件（VectorIndex 只能基于文件加载）
            Path tempFile = Files.createTempFile("ip2region", ".xdb");
            try (InputStream is = resource.getInputStream()) {
                Files.copy(is, tempFile, java.nio.file.StandardCopyOption.REPLACE_EXISTING);
            }

            // ✅ 3. 预加载 VectorIndex（大幅减少 I/O）
            byte[] vIndex;
            try {
                vIndex = Searcher.loadVectorIndexFromFile(tempFile.toString());
                System.out.println("VectorIndex loaded, length = " + vIndex.length);
            } catch (Exception e) {
                throw new IOException("加载 VectorIndex 失败: " + e.getMessage(), e);
            }

            // ✅ 4. 创建使用 VectorIndex 缓存的 Searcher
            searcher = Searcher.newWithVectorIndex(ipVersion, tempFile.toString(), vIndex);
            System.out.println("IP2Region searcher initialized with vector index cache.");

        } catch (IOException e) {
            System.err.printf("failed to create searcher with `%s`: %s%n", dbPath, e);
            throw new IOException("Failed to initialize IP2Region searcher", e);
        }
    }

    // 查询 IP 地理位置
    public String getCityInfo(String ip) {
        try {
            long start = System.nanoTime();
            String region = searcher.search(ip);
            long cost = TimeUnit.NANOSECONDS.toMicros(System.nanoTime() - start);
            System.out.printf("{region: %s, ioCount: %d, took: %d μs}%n",
                    region, searcher.getIOCount(), cost);
            return region;
        } catch (Exception e) {
            System.err.printf("failed to search(%s): %s%n", ip, e);
            return null;
        }
    }

    public void close() throws IOException {
        if (searcher != null) {
            searcher.close();
        }
    }
}