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
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“
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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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