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
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：
