Java IP地址解析工具ip2region，什么是ip2region？

ip2region – 准确率99.9%的离线IP地址定位库，0.0x毫秒级查询，ip2region.db数据库只有数MB，提供了java,php,c,python,nodejs,golang,c#等查询绑定和Binary,B-tree,内存三种查询算法。

实现的基本流程：

一、导入依赖：

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

工程的所有依赖（xml文件内代码，没什么用）：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>Ipsearch</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>Ipsearch</name>
    <description>Ipsearch</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- ip2region -->
        <dependency>
            <groupId>org.lionsoul</groupId>
            <artifactId>ip2region</artifactId>
            <version>1.7.2</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>2.5.12 </version>
            </plugin>
        </plugins>
    </build>

</project>

二、下载ip2region.db文件：

下载后将文件放到resources文件夹下：

三、配置一个工具类IPUtil，代码如下：

package com.example.ipsearch.Sutil;

import org.lionsoul.ip2region.DataBlock;
import org.lionsoul.ip2region.DbConfig;
import org.lionsoul.ip2region.DbSearcher;
import org.lionsoul.ip2region.Util;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.lang.reflect.Method;
import java.net.URL;

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) {
        URL url = IPUtil.class.getClassLoader().getResource("ip2region.db");
        File file;
        if (url != null) {
            file = new File(url.getFile());
        } else {
            return null;
        }
        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;
    }

}

四、调用方法：

只调用类中的第二个方法即可实现ip地址向所属地的转化：

System.out.println(IPUtil.getCityInfo("ip"));

这里把”ip”换成具体的ip地址，运行即可实现单个ip地址转化为所属地的输出。

若想输出上万个ip的所属地，可以把ip全部放到txt文件里，通过BufferedReader类中的方法读取txt文件中的ip，存到Arraylist中用循环全部输出，具体代码如下：

package com.example.ipsearch;

import com.example.ipsearch.Sutil.IPUtil;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

import java.io.*;
import java.util.ArrayList;
import java.util.List;

@SpringBootApplication
public class IpsearchApplication {

    public static void main(String[] args) throws IOException {
        SpringApplication.run(IpsearchApplication.class, args);
        File a=new File("E:\\test.txt");
        FileReader b = null; // 创建FileInputStream类对象读取File
        BufferedReader c = null; // 创建reader缓冲区将文件流装进去
        b = new FileReader(a);
        c = new BufferedReader(b);
        String e=null;
        List <String> f=new ArrayList<>();
        while ((e=c.readLine())!=null)
            {


                f.add(e);
            }

         b.close();
         c.close();
        for(String f1:f)
        {
            System.out.println(IPUtil.getCityInfo(f1));
        }

    };

}

五、工程框架结构及运行结果展示：

原文链接：https://blog.csdn.net/qq_52506111/article/details/126158406