使用ip-attribution.dat文件实现IP归属地查询

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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());    }}

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