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用java實現對純真IP數據庫的查詢，首先到網上下載QQwry.da文件，讀取代碼如下：
1.IP記錄實體類

package com.guess.tools;

/**
* 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 *
?**/
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(){
?????? return??????? this.area+"? "+this.country+"IP范圍:"+this.beginIp+"-"+this.endIp;
??? }
?? }?

?

??

?/**???

????*?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
???? *??

?*/
??? 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;
??????? }
??? }

2.讀取QQwry.dat文件類

package com.guess.tools;

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
?*/
public class IPSeeker {

??? 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();
??? }
??? public static void main(String args[]) {
??? ?List list=IPSeeker.getInstance().getIPEntriesDebug("浙江省杭州市");
??? ?
??? ??
??? ?
??? }
}

?

轉載于:https://my.oschina.net/u/267665/blog/543748

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