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这篇文章主要介绍“使用ip-attribution.dat文件实现IP归属地查询”，在日常操作中，相信很多人在使用ip-attribution.dat文件实现IP归属地查询问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”使用ip-attribution.dat文件实现IP归属地查询”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
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使用ip-attribution.dat文件实现IP归属地查询。下载地址
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package com.sky.common.utils;
import cn.hutool.core.io.resource.ClassPathResource;
import org.apache.commons.lang3.StringUtils;
import java.io.*;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
/**
* ip归属地解析
*
* @author Moses wsj1198878990@126.com
* @since 1.0.0 2019-10-22
*/
public final class IPDataHandler {
private static DataInputStream inputStream = null;
private static long fileLength = -1;
private static int dataLength = -1;
private static Map cacheMap = null;
private static byte[] allData = null;
static {
// File file = new File(IP_DATA_PATH);
try {
//把文件放到src/main/resources下面
File file = new ClassPathResource("ip-attribution.dat").getFile();
inputStream = new DataInputStream(new FileInputStream(file));
fileLength = file.length();
cacheMap = new HashMap();
if (fileLength > Integer.MAX_VALUE) {
throw new Exception("the filelength over 2GB");
}
dataLength = (int) fileLength;
allData = new byte[dataLength];
inputStream.read(allData, 0, dataLength);
dataLength = (int) getbytesTolong(allData, 0, 4,
ByteOrder.BIG_ENDIAN);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
private static long getbytesTolong(byte[] bytes, int offerSet, int size,
ByteOrder byteOrder) {
if ((offerSet + size) > bytes.length || size <= 0) {
return -1;
}
byte[] b = new byte[size];
for (int i = 0; i < b.length; i++) {
b[i] = bytes[offerSet + i];
}
ByteBuffer byteBuffer = ByteBuffer.wrap(b);
byteBuffer.order(byteOrder);
long temp = -1;
if (byteBuffer.hasRemaining()) {
temp = byteBuffer.getInt();
}
return temp;
}
private static long ip2long(String ip) throws UnknownHostException {
InetAddress address = InetAddress.getByName(ip);
byte[] bytes = address.getAddress();
long reslut = getbytesTolong(bytes, 0, 4, ByteOrder.BIG_ENDIAN);
return reslut;
}
private static int getIntByBytes(byte[] b, int offSet) {
if (b == null || (b.length < (offSet + 3))) {
return -1;
}
byte[] bytes = Arrays.copyOfRange(allData, offSet, offSet + 3);
byte[] bs = new byte[4];
bs[3] = 0;
for (int i = 0; i < 3; i++) {
bs[i] = bytes[i];
}
return (int) getbytesTolong(bs, 0, 4, ByteOrder.LITTLE_ENDIAN);
}
public static String findGeography(String address) {
if (StringUtils.isBlank(address)) {
return "illegal address";
}
if (dataLength < 4 || allData == null) {
return "illegal ip data";
}
String ip = "127.0.0.1";
try {
ip = Inet4Address.getByName(address).getHostAddress();
} catch (UnknownHostException e) {
e.printStackTrace();
}
String[] ipArray = StringUtils.split(ip, ".");
int ipHeadValue = Integer.parseInt(ipArray[0]);
if (ipArray.length != 4 || ipHeadValue < 0 || ipHeadValue > 255) {
return "illegal ip";
}
if (cacheMap.containsKey(ip)) {
return cacheMap.get(ip);
}
long numIp = 1;
try {
numIp = ip2long(address);
} catch (UnknownHostException e1) {
e1.printStackTrace();
}
int tempOffSet = ipHeadValue * 4 + 4;
long start = getbytesTolong(allData, tempOffSet, 4,
ByteOrder.LITTLE_ENDIAN);
int max_len = dataLength - 1028;
long resultOffSet = 0;
int resultSize = 0;
for (start = start * 8 + 1024; start < max_len; start += 8) {
if (getbytesTolong(allData, (int) start + 4, 4,
ByteOrder.BIG_ENDIAN) >= numIp) {
resultOffSet = getIntByBytes(allData, (int) (start + 4 + 4));
resultSize = (char) allData[(int) start + 7 + 4];
break;
}
}
if (resultOffSet <= 0) {
return "resultOffSet too small";
}
byte[] add = Arrays.copyOfRange(allData, (int) (dataLength
+ resultOffSet - 1024),
(int) (dataLength + resultOffSet - 1024 + resultSize));
try {
if (add == null) {
cacheMap.put(ip, new String("no data found!!"));
} else {
cacheMap.put(ip, new String(add, "UTF-8"));
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return cacheMap.get(ip);
}
public static void main(String[] args) {
String s = findGeography("61.164.169.58");
System.out.println(s.trim());
}
} 到此，关于“使用ip-attribution.dat文件实现IP归属地查询”的学习就结束了，希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习，快去试试吧！若想继续学习更多相关知识，请继续关注创新互联网站，小编会继续努力为大家带来更多实用的文章！