java讀取純真IP數據庫QQwry.dat的源代碼,要運行此程序必須有
到網上下載QQwry.da，由于太大，我這里就不提供了。
一、IPEntry.java
/** *
* 一條IP范圍記錄，不僅包括國家和區域，也包括起始IP和結束IP *?
*?
* @author 馬若劼
*/
public class IPEntry {
????public String beginIp;
????public String endIp;
????public String country;
????public String area;
????
????/**
???? * 構造函數
???? */
???
public IPEntry() {
????????beginIp = endIp = country = area = "";
????}
????
????public String toString(){
?? ????retur????????this.area+"??"+this.country+"IP范圍:"+this.beginIp+"-"+this.endIp;
????}
?? }?
二、Utils.java
/*
* Created on 2004-8-4
*
*/
import java.io.UnsupportedEncodingException;
/**
* @author LJ-silver
*/
public class Utils {
????/**
???? * 從ip的字符串形式得到字節數組形式
???? * @param ip 字符串形式的ip
???? * @return 字節數組形式的ip
???? */
????public static byte[] getIpByteArrayFromString(String ip) {
????????byte[] ret = new byte[4];
????????java.util.StringTokenizer st = new java.util.StringTokenizer(ip, ".");
????????try {
????????????ret[0] = (byte)(Integer.parseInt(st.nextToken()) & 0xFF);
????????????ret[1] = (byte)(Integer.parseInt(st.nextToken()) & 0xFF);
????????????ret[2] = (byte)(Integer.parseInt(st.nextToken()) & 0xFF);
????????????ret[3] = (byte)(Integer.parseInt(st.nextToken()) & 0xFF);
????????} catch (Exception e) {
????????????System.out.println(e.getMessage());
????????}
????????return ret;
????}
????
????public static void main(String args[]){
???????? byte[] a=getIpByteArrayFromString(args[0]);
??????????for(int i=0;i< a.length;i++)
????????????????System.out.println(a[i]);
??????????System.out.println(getIpStringFromBytes(a));?
????}
????/**
???? * 對原始字符串進行編碼轉換，如果失敗，返回原始的字符串
???? * @param s 原始字符串
???? * @param srcEncoding 源編碼方式
???? * @param destEncoding 目標編碼方式
???? * @return 轉換編碼后的字符串，失敗返回原始字符串
???? */
????public static String getString(String s, String srcEncoding, String destEncoding) {
????????try {
????????????return new String(s.getBytes(srcEncoding), destEncoding);
????????} catch (UnsupportedEncodingException e) {
????????????return s;
????????}
????}
????
????/**
???? * 根據某種編碼方式將字節數組轉換成字符串
???? * @param b 字節數組
???? * @param encoding 編碼方式
???? * @return 如果encoding不支持，返回一個缺省編碼的字符串
???? */
????public static String getString(byte[] b, String encoding) {
????????try {
????????????return new String(b, encoding);
????????} catch (UnsupportedEncodingException e) {
????????????return new String(b);
????????}
????}
????
????/**
???? * 根據某種編碼方式將字節數組轉換成字符串
???? * @param b 字節數組
???? * @param offset 要轉換的起始位置
???? * @param len 要轉換的長度
???? * @param encoding 編碼方式
???? * @return 如果encoding不支持，返回一個缺省編碼的字符串
???? */
????public static String getString(byte[] b, int offset, int len, String encoding) {
????????try {
????????????return new String(b, offset, len, encoding);
????????} catch (UnsupportedEncodingException e) {
????????????return new String(b, offset, len);
????????}
????}
????
????/**
???? * @param ip ip的字節數組形式
???? * @return 字符串形式的ip
???? */
????public static String getIpStringFromBytes(byte[] ip) {
????????StringBuffer sb = new StringBuffer();
????????sb.append(ip[0] & 0xFF);
????????sb.append('.');?? ????
????????sb.append(ip[1] & 0xFF);
????????sb.append('.');?? ????
????????sb.append(ip[2] & 0xFF);
????????sb.append('.');?? ????
????????sb.append(ip[3] & 0xFF);
????????return sb.toString();
????}
}?
三、IPSeeker.java
/*
* LumaQQ - Java QQ Client
*
* Copyright (C) 2004 luma < stubma@163.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteOrder;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.List;
/**
*??* 用來讀取QQwry.dat文件，以根據ip獲得好友位置，QQwry.dat的格式是
* 一. 文件頭，共8字節
* ?????? 1. 第一個起始IP的絕對偏移， 4字節
*???? 2. 最后一個起始IP的絕對偏移， 4字節
* 二. "結束地址/國家/區域"記錄區
*???? 四字節ip地址后跟的每一條記錄分成兩個部分
*???? 1. 國家記錄
*???? 2. 地區記錄
*???? 但是地區記錄是不一定有的。而且國家記錄和地區記錄都有兩種形式
*???? 1. 以0結束的字符串
*???? 2. 4個字節，一個字節可能為0x1或0x2
* ??????????a. 為0x1時，表示在絕對偏移后還跟著一個區域的記錄，注意是絕對偏移之后，而不是這四個字節之后
*????????b. 為0x2時，表示在絕對偏移后沒有區域記錄
*????????不管為0x1還是0x2，后三個字節都是實際國家名的文件內絕對偏移
* ??????????如果是地區記錄，0x1和0x2的含義不明，但是如果出現這兩個字節，也肯定是跟著3個字節偏移，如果不是
*????????則為0結尾字符串
* 三. "起始地址/結束地址偏移"記錄區
*???? 1. 每條記錄7字節，按照起始地址從小到大排列
*????????a. 起始IP地址，4字節
*????????b. 結束ip地址的絕對偏移，3字節
*
* 注意，這個文件里的ip地址和所有的偏移量均采用little-endian格式，而java是采用
* big-endian格式的，要注意轉換
*?
*
* @author 馬若劼
*/
public class IPSeeker {
????/**
???? * ???? * 用來封裝ip相關信息，目前只有兩個字段，ip所在的國家和地區
???? *?
???? *
???? * @author 馬若劼
???? */
????private class IPLocation {
????????public String country;
????????public String area;
????????public IPLocation() {
????????????country = area = "";
????????}
????????public IPLocation getCopy() {
????????????IPLocation ret = new IPLocation();
????????????ret.country = country;
????????????ret.area = area;
????????????return ret;
????????}
????}
????private static final String IP_FILE = IPSeeker.class.getResource("/QQWry.dat").toString().substring(5);
????// 一些固定常量，比如記錄長度等等
????private static final int IP_RECORD_LENGTH = 7;
????private static final byte AREA_FOLLOWED = 0x01;
????private static final byte NO_AREA = 0x2;
????// 用來做為cache，查詢一個ip時首先查看cache，以減少不必要的重復查找
????private Hashtable ipCache;
????// 隨機文件訪問類
????private RandomAccessFile ipFile;
????// 內存映射文件
????private MappedByteBuffer mbb;
????// 單一模式實例
????private static IPSeeker instance = new IPSeeker();
????// 起始地區的開始和結束的絕對偏移
????private long ipBegin, ipEnd;
????// 為提高效率而采用的臨時變量
????private IPLocation loc;
????private byte[] buf;
????private byte[] b4;
????private byte[] b3;
????/**
???? * 私有構造函數
???? */
????private IPSeeker()??{
????????ipCache = new Hashtable();
????????loc = new IPLocation();
????????buf = new byte[100];
????????b4 = new byte[4];
????????b3 = new byte[3];
????????try {
????????????ipFile = new RandomAccessFile(IP_FILE, "r");
????????} catch (FileNotFoundException e) {
????????????????????????System.out.println(IPSeeker.class.getResource("/QQWry.dat").toString());
????????????????????????System.out.println(IP_FILE);
????????????System.out.println("IP地址信息文件沒有找到，IP顯示功能將無法使用");
????????????ipFile = null;
????????}
????????// 如果打開文件成功，讀取文件頭信息
????????if(ipFile != null) {
????????????try {
????????????????ipBegin = readLong4(0);
????????????????ipEnd = readLong4(4);
????????????????if(ipBegin == -1 || ipEnd == -1) {
????????????????????ipFile.close();
????????????????????ipFile = null;
????????????????}
????????????} catch (IOException e) {
????????????????System.out.println("IP地址信息文件格式有錯誤，IP顯示功能將無法使用");
????????????????ipFile = null;
????????????}
????????}
????}
????/**
???? * @return 單一實例
???? */
????public static IPSeeker getInstance() {
????????return instance;
????}
????/**
???? * 給定一個地點的不完全名字，得到一系列包含s子串的IP范圍記錄
???? * @param s 地點子串
???? * @return 包含IPEntry類型的List
???? */
????public List getIPEntriesDebug(String s) {
????????List ret = new ArrayList();
????????long endOffset = ipEnd + 4;
????????for(long offset = ipBegin + 4; offset <= endOffset; offset += IP_RECORD_LENGTH) {
????????????// 讀取結束IP偏移
????????????long temp = readLong3(offset);
????????????// 如果temp不等于-1，讀取IP的地點信息
????????????if(temp != -1) {
????????????????IPLocation loc = getIPLocation(temp);
????????????????// 判斷是否這個地點里面包含了s子串，如果包含了，添加這個記錄到List中，如果沒有，繼續
????????????????if(loc.country.indexOf(s) != -1 || loc.area.indexOf(s) != -1) {
????????????????????IPEntry entry = new IPEntry();
????????????????????entry.country = loc.country;
????????????????????entry.area = loc.area;
????????????????????// 得到起始IP
????????????????????readIP(offset - 4, b4);
????????????????????entry.beginIp = Utils.getIpStringFromBytes(b4);
????????????????????// 得到結束IP
????????????????????readIP(temp, b4);
????????????????????entry.endIp = Utils.getIpStringFromBytes(b4);
????????????????????// 添加該記錄
????????????????????ret.add(entry);
????????????????}
????????????}
????????}
????????return ret;
????}
????/**
???? * 給定一個地點的不完全名字，得到一系列包含s子串的IP范圍記錄
???? * @param s 地點子串
???? * @return 包含IPEntry類型的List
???? */
????public List getIPEntries(String s) {
????????List ret = new ArrayList();
????????try {
????????????// 映射IP信息文件到內存中
????????????if(mbb == null) {
????????????????FileChannel fc = ipFile.getChannel();
????????????????mbb = fc.map(FileChannel.MapMode.READ_ONLY, 0, ipFile.length());
????????????????mbb.order(ByteOrder.LITTLE_ENDIAN);
????????????}
????????????int endOffset = (int)ipEnd;
????????????for(int offset = (int)ipBegin + 4; offset <= endOffset; offset += IP_RECORD_LENGTH) {
????????????????int temp = readInt3(offset);
????????????????if(temp != -1) {
????????????????????IPLocation loc = getIPLocation(temp);
????????????????????// 判斷是否這個地點里面包含了s子串，如果包含了，添加這個記錄到List中，如果沒有，繼續
????????????????????if(loc.country.indexOf(s) != -1 || loc.area.indexOf(s) != -1) {
????????????????????????IPEntry entry = new IPEntry();
????????????????????????entry.country = loc.country;
????????????????????????entry.area = loc.area;
????????????????????????// 得到起始IP
????????????????????????readIP(offset - 4, b4);
????????????????????????entry.beginIp = Utils.getIpStringFromBytes(b4);
????????????????????????// 得到結束IP
????????????????????????readIP(temp, b4);
????????????????????????entry.endIp = Utils.getIpStringFromBytes(b4);
????????????????????????// 添加該記錄
????????????????????????ret.add(entry);
????????????????????}
????????????????}
????????????}
????????} catch (IOException e) {
????????????System.out.println(e.getMessage());
????????}
????????return ret;
????}
????/**
???? * 從內存映射文件的offset位置開始的3個字節讀取一個int
???? * @param offset
???? * @return
???? */
????private int readInt3(int offset) {
????????mbb.position(offset);
????????return mbb.getInt() & 0x00FFFFFF;
????}
????/**
???? * 從內存映射文件的當前位置開始的3個字節讀取一個int
???? * @return
???? */
????private int readInt3() {
????????return mbb.getInt() & 0x00FFFFFF;
????}
????/**
???? * 根據IP得到國家名
???? * @param ip ip的字節數組形式
???? * @return 國家名字符串
???? */
????public String getCountry(byte[] ip) {
????????// 檢查ip地址文件是否正常
????????if(ipFile == null) return "錯誤的IP數據庫文件";
????????// 保存ip，轉換ip字節數組為字符串形式
????????String ipStr = Utils.getIpStringFromBytes(ip);
????????// 先檢查cache中是否已經包含有這個ip的結果，沒有再搜索文件
????????if(ipCache.containsKey(ipStr)) {
????????????IPLocation loc = (IPLocation)ipCache.get(ipStr);
????????????return loc.country;
????????} else {
????????????IPLocation loc = getIPLocation(ip);
????????????ipCache.put(ipStr, loc.getCopy());
????????????return loc.country;
????????}
????}
????/**
???? * 根據IP得到國家名
???? * @param ip IP的字符串形式
???? * @return 國家名字符串
???? */
????public String getCountry(String ip) {
????????return getCountry(Utils.getIpByteArrayFromString(ip));
????}
????/**
???? * 根據IP得到地區名
???? * @param ip ip的字節數組形式
???? * @return 地區名字符串
???? */
????public String getArea(byte[] ip) {
????????// 檢查ip地址文件是否正常
????????if(ipFile == null) return "錯誤的IP數據庫文件";
????????// 保存ip，轉換ip字節數組為字符串形式
????????String ipStr = Utils.getIpStringFromBytes(ip);
????????// 先檢查cache中是否已經包含有這個ip的結果，沒有再搜索文件
????????if(ipCache.containsKey(ipStr)) {
????????????IPLocation loc = (IPLocation)ipCache.get(ipStr);
????????????return loc.area;
????????} else {
????????????IPLocation loc = getIPLocation(ip);
????????????ipCache.put(ipStr, loc.getCopy());
????????????return loc.area;
????????}
????}
????/**
???? * 根據IP得到地區名
???? * @param ip IP的字符串形式
???? * @return 地區名字符串
???? */
????public String getArea(String ip) {
????????return getArea(Utils.getIpByteArrayFromString(ip));
????}
????/**
???? * 根據ip搜索ip信息文件，得到IPLocation結構，所搜索的ip參數從類成員ip中得到
???? * @param ip 要查詢的IP
???? * @return IPLocation結構
???? */
????private IPLocation getIPLocation(byte[] ip) {
????????IPLocation info = null;
????????long offset = locateIP(ip);
????????if(offset != -1)
????????????info = getIPLocation(offset);
????????if(info == null) {
????????????info = new IPLocation();
????????????info.country = "未知國家";
????????????info.area = "未知地區";
????????}
????????return info;
????}
????/**
???? * 從offset位置讀取4個字節為一個long，因為java為big-endian格式，所以沒辦法
???? * 用了這么一個函數來做轉換
???? * @param offset
???? * @return 讀取的long值，返回-1表示讀取文件失敗
???? */
????private long readLong4(long offset) {
????????long ret = 0;
????????try {
????????????ipFile.seek(offset);
????????????ret |= (ipFile.readByte() & 0xFF);
????????????ret |= ((ipFile.readByte() << 8) & 0xFF00);
????????????ret |= ((ipFile.readByte() << 16) & 0xFF0000);
????????????ret |= ((ipFile.readByte() << 24) & 0xFF000000);
????????????return ret;
????????} catch (IOException e) {
????????????return -1;
????????}
????}
????/**
???? * 從offset位置讀取3個字節為一個long，因為java為big-endian格式，所以沒辦法
???? * 用了這么一個函數來做轉換
???? * @param offset
???? * @return 讀取的long值，返回-1表示讀取文件失敗
???? */
????private long readLong3(long offset) {
????????long ret = 0;
????????try {
????????????ipFile.seek(offset);
????????????ipFile.readFully(b3);
????????????ret |= (b3[0] & 0xFF);
????????????ret |= ((b3[1] << 8) & 0xFF00);
????????????ret |= ((b3[2] << 16) & 0xFF0000);
????????????return ret;
????????} catch (IOException e) {
????????????return -1;
????????}
????}
????/**
???? * 從當前位置讀取3個字節轉換成long
???? * @return
???? */
????private long readLong3() {
????????long ret = 0;
????????try {
????????????ipFile.readFully(b3);
????????????ret |= (b3[0] & 0xFF);
????????????ret |= ((b3[1] << 8) & 0xFF00);
????????????ret |= ((b3[2] << 16) & 0xFF0000);
????????????return ret;
????????} catch (IOException e) {
????????????return -1;
????????}
????}
????/**
???? * 從offset位置讀取四個字節的ip地址放入ip數組中，讀取后的ip為big-endian格式，但是
???? * 文件中是little-endian形式，將會進行轉換
???? * @param offset
???? * @param ip
???? */
????private void readIP(long offset, byte[] ip) {
????????try {
????????????ipFile.seek(offset);
????????????ipFile.readFully(ip);
????????????byte temp = ip[0];
????????????ip[0] = ip[3];
????????????ip[3] = temp;
????????????temp = ip[1];
????????????ip[1] = ip[2];
????????????ip[2] = temp;
????????} catch (IOException e) {
????????????System.out.println(e.getMessage());
????????}
????}
????/**
???? * 從offset位置讀取四個字節的ip地址放入ip數組中，讀取后的ip為big-endian格式，但是
???? * 文件中是little-endian形式，將會進行轉換
???? * @param offset
???? * @param ip
???? */
????private void readIP(int offset, byte[] ip) {
????????mbb.position(offset);
????????mbb.get(ip);
????????byte temp = ip[0];
????????ip[0] = ip[3];
????????ip[3] = temp;
????????temp = ip[1];
????????ip[1] = ip[2];
????????ip[2] = temp;
????}
????/**
???? * 把類成員ip和beginIp比較，注意這個beginIp是big-endian的
???? * @param ip 要查詢的IP
???? * @param beginIp 和被查詢IP相比較的IP
???? * @return 相等返回0，ip大于beginIp則返回1，小于返回-1。
???? */
????private int compareIP(byte[] ip, byte[] beginIp) {
????????for(int i = 0; i < 4; i++) {
????????????int r = compareByte(ip[i], beginIp[i]);
????????????if(r != 0)
????????????????return r;
????????}
????????return 0;
????}
????/**
???? * 把兩個byte當作無符號數進行比較
???? * @param b1
???? * @param b2
???? * @return 若b1大于b2則返回1，相等返回0，小于返回-1
???? */
????private int compareByte(byte b1, byte b2) {
????????if((b1 & 0xFF) > (b2 & 0xFF)) // 比較是否大于
????????????return 1;
????????else if((b1 ^ b2) == 0)// 判斷是否相等
????????????return 0;
????????else
????????????return -1;
????}
????/**
???? * 這個方法將根據ip的內容，定位到包含這個ip國家地區的記錄處，返回一個絕對偏移
???? * 方法使用二分法查找。
???? * @param ip 要查詢的IP
???? * @return 如果找到了，返回結束IP的偏移，如果沒有找到，返回-1
???? */
????private long locateIP(byte[] ip) {
????????long m = 0;
????????int r;
????????// 比較第一個ip項
????????readIP(ipBegin, b4);
????????r = compareIP(ip, b4);
????????if(r == 0) return ipBegin;
????????else if(r < 0) return -1;
????????// 開始二分搜索
????????for(long i = ipBegin, j = ipEnd; i < j; ) {
????????????m = getMiddleOffset(i, j);
????????????readIP(m, b4);
????????????r = compareIP(ip, b4);
????????????// log.debug(Utils.getIpStringFromBytes(b));
????????????if(r > 0)
????????????????i = m;
????????????else if(r < 0) {
????????????????if(m == j) {
????????????????????j -= IP_RECORD_LENGTH;
????????????????????m = j;
????????????????} else
????????????????????j = m;
????????????} else
????????????????return readLong3(m + 4);
????????}
????????// 如果循環結束了，那么i和j必定是相等的，這個記錄為最可能的記錄，但是并非
????????//???? 肯定就是，還要檢查一下，如果是，就返回結束地址區的絕對偏移
????????m = readLong3(m + 4);
????????readIP(m, b4);
????????r = compareIP(ip, b4);
????????if(r <= 0) return m;
????????else return -1;
????}
????/**
???? * 得到begin偏移和end偏移中間位置記錄的偏移
???? * @param begin
???? * @param end
???? * @return
???? */
????private long getMiddleOffset(long begin, long end) {
????????long records = (end - begin) / IP_RECORD_LENGTH;
????????records >>= 1;
????????if(records == 0) records = 1;
????????return begin + records * IP_RECORD_LENGTH;
????}
????/**
???? * 給定一個ip國家地區記錄的偏移，返回一個IPLocation結構
???? * @param offset
???? * @return
???? */
????private IPLocation getIPLocation(long offset) {
????????try {
????????????// 跳過4字節ip
????????????ipFile.seek(offset + 4);
????????????// 讀取第一個字節判斷是否標志字節
????????????byte b = ipFile.readByte();
????????????if(b == AREA_FOLLOWED) {
????????????????// 讀取國家偏移
????????????????long countryOffset = readLong3();
????????????????// 跳轉至偏移處
????????????????ipFile.seek(countryOffset);
????????????????// 再檢查一次標志字節，因為這個時候這個地方仍然可能是個重定向
????????????????b = ipFile.readByte();
????????????????if(b == NO_AREA) {
????????????????????loc.country = readString(readLong3());
????????????????????ipFile.seek(countryOffset + 4);
????????????????} else
????????????????????loc.country = readString(countryOffset);
????????????????// 讀取地區標志
????????????????loc.area = readArea(ipFile.getFilePointer());
????????????} else if(b == NO_AREA) {
????????????????loc.country = readString(readLong3());
????????????????loc.area = readArea(offset + 8);
????????????} else {
????????????????loc.country = readString(ipFile.getFilePointer() - 1);
????????????????loc.area = readArea(ipFile.getFilePointer());
????????????}
????????????return loc;
????????} catch (IOException e) {
????????????return null;
????????}
????}
????/**
???? * @param offset
???? * @return
???? */
????private IPLocation getIPLocation(int offset) {
????????// 跳過4字節ip
????????mbb.position(offset + 4);
????????// 讀取第一個字節判斷是否標志字節
????????byte b = mbb.get();
????????if(b == AREA_FOLLOWED) {
????????????// 讀取國家偏移
????????????int countryOffset = readInt3();
????????????// 跳轉至偏移處
????????????mbb.position(countryOffset);
????????????// 再檢查一次標志字節，因為這個時候這個地方仍然可能是個重定向
????????????b = mbb.get();
????????????if(b == NO_AREA) {
????????????????loc.country = readString(readInt3());
????????????????mbb.position(countryOffset + 4);
????????????} else
????????????????loc.country = readString(countryOffset);
????????????// 讀取地區標志
????????????loc.area = readArea(mbb.position());
????????} else if(b == NO_AREA) {
????????????loc.country = readString(readInt3());
????????????loc.area = readArea(offset + 8);
????????} else {
????????????loc.country = readString(mbb.position() - 1);
????????????loc.area = readArea(mbb.position());
????????}
????????return loc;
????}
????/**
???? * 從offset偏移開始解析后面的字節，讀出一個地區名
???? * @param offset
???? * @return 地區名字符串
???? * @throws IOException
???? */
????private String readArea(long offset) throws IOException {
????????ipFile.seek(offset);
????????byte b = ipFile.readByte();
????????if(b == 0x01 || b == 0x02) {
????????????long areaOffset = readLong3(offset + 1);
????????????if(areaOffset == 0)
????????????????return "未知地區";
????????????else
????????????????return readString(areaOffset);
????????} else
????????????return readString(offset);
????}
????/**
???? * @param offset
???? * @return
???? */
????private String readArea(int offset) {
????????mbb.position(offset);
????????byte b = mbb.get();
????????if(b == 0x01 || b == 0x02) {
????????????int areaOffset = readInt3();
????????????if(areaOffset == 0)
????????????????return "未知地區";
????????????else
????????????????return readString(areaOffset);
????????} else
????????????return readString(offset);
????}
????/**
???? * 從offset偏移處讀取一個以0結束的字符串
???? * @param offset
???? * @return 讀取的字符串，出錯返回空字符串
???? */
????private String readString(long offset) {
????????try {
????????????ipFile.seek(offset);
????????????int i;
????????????for(i = 0, buf[i] = ipFile.readByte(); buf[i] != 0; buf[++i] = ipFile.readByte());
????????????if(i != 0)
????????????????return Utils.getString(buf, 0, i, "GBK");
????????} catch (IOException e) {
????????????System.out.println(e.getMessage());
????????}
????????return "";
????}
????/**
???? * 從內存映射文件的offset位置得到一個0結尾字符串
???? * @param offset
???? * @return
???? */
????private String readString(int offset) {
????????try {
????????????mbb.position(offset);
????????????int i;
????????????for(i = 0, buf[i] = mbb.get(); buf[i] != 0; buf[++i] = mbb.get());
????????????if(i != 0)
????????????????return Utils.getString(buf, 0, i, "GBK");
????????} catch (IllegalArgumentException e) {
????????????System.out.println(e.getMessage());
????????}
????????return "";
????}
????public String getAddress(String ip){
????????String country = getCountry(ip).equals(" CZ88.NET")?"":getCountry(ip);
????????String area = getArea(ip).equals(" CZ88.NET")?"":getArea(ip);
????????String address = country+" "+area;
????????return address.trim();
????}
}