Java - 根据IP获取城市

 

原链接：根据IP获取城市-Java调用“ip2region”地址库实例-妈妈再也不用担心我的ip地址定位啦 

 

• ip2region

准确率99.9%的ip地址定位库，0.0x毫秒级查询，数据库文件大小只有1.5M，提供了java,php,c,python,nodejs,golang查询绑定和Binary,B树,内存三种查询算法

github地址：https://github.com/lionsoul2014/ip2region

• 下载v1.3版本：https://github.com/lionsoul2014/ip2region/releases/tag/v1.3-release

解压目录如下图：

• 新建java项目，导入binding/java下的代码，并复制”data/ip2region.db”到“src目录

• 创建“IPUtil”.java ,内容参考”org.lionsoul.ip2region.test.TestSearcher.java“

package com.xx;

import java.io.File;
import java.lang.reflect.Method;

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

public class IPUtil {

    public static String getCityInfo(String ip){

        //db
        String dbPath = IPUtil.class.getResource("/ip2region.db").getPath();

        File file = new File(dbPath);
        if ( file.exists() == false ) {
            System.out.println("Error: Invalid ip2region.db file");
        }

        //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, dbPath);

            //define the method
            Method method = null;
            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;
            }

            DataBlock dataBlock = null;
            if ( Util.isIpAddress(ip) == false ) {
                System.out.println("Error: Invalid ip address");
            }

            dataBlock  = (DataBlock) method.invoke(searcher, ip);

            return dataBlock.getRegion();

        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }


    public static void main(String[] args)  throws Exception{
        System.err.println(getCityInfo("220.248.12.158"));
    }
}

　　

运行结果如下：

 

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