IP定位
ip定位 已經不是什么新的技術，但是在做項目中卻會常常用到。找網上找了許久，也做了許多的實驗，覺得QQwry.dat，很很好用的，作者也提供了開發的源碼和大家分享。 在這里感謝作者。
我在項目中也用到了ip定位，寫了代碼，希望能給沒有用過的朋友有所幫助。
???? 項目中包含了QQwry.dat數據，和代碼。
?
????? 我傳到附件中，供大家下載,大家可以到我的博客中下載附件，這里不能上傳附件，直接方法Eclipse就能運行的。有jdk提供的庫就行了，不需要額外的jar。這要填入ip就行了，在web應用中獲得ip的方法? request.getRemoteAddr().toString();。
給大家還是把代碼貼出來：
ip
|
|-------src
????? |---com
????????? |-----ip
????????? |???? |------IPEntry.java
????????? |???? |------IPSeeker.java
????????? |???? |------Utils.java
????????? |???? |------QQWry.dat
????????? |-----TestIP.java
?????????
代碼 ：
=========================IPEntry.java===========================
package com.ip;
//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;
public IPEntry() {
beginIp = "";
endIp = "";
country = "";
area = "";
}
@Override
public String toString() {
return this.area + "? " + this.country + "? IP范圍:" + this.beginIp + "-"
+ this.endIp;
}
}
============================IPSeeker.java================================
package com.ip;
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;
/**
* <pre>
* 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
* </pre>
*
*/
public class IPSeeker {
/**
* <pre>
* 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
* </pre>
*
*
*/
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 final 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 final IPLocation loc;
private final byte[] buf;
private final byte[] b4;
private final 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() << & 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] << & 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] << & 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 +;
} 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 +;
} 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();
}
}
=============================Utils.java===================================
package com.ip;
import java.io.UnsupportedEncodingException;
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;
}
/**
* 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();
}
}
============================TestIP.java===================================
package com;
import com.ip.IPSeeker;
public class TestIP {
public static void main(String[] args) {
IPSeeker seeker = IPSeeker.getInstance();
String ip ="222.222.137.194";//放入要測試的ip地址
String ip1="116.233.156.204";
??????? System.out.println(seeker.getAddress(ip1));
}
}
================================完了==================================
QQWry.dat沒有辦法貼出來了，大家可以到網下下載最新版本的。
?
?
?
?
?
引用 收藏?
?lgl669 2009-06-24
有的代碼被 給代替了，應該是Java代碼?
8)?
8)引用 收藏?
?lgl669 2009-06-24
Java代碼?
package com.ip;??
//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;??
??? public IPEntry() {??
??????? beginIp = "";??
??????? endIp = "";??
??????? country = "";??
??????? area = "";??
??? }??
?
??? @Override?
??? public String toString() {??
??????? return this.area + "? " + this.country + "? IP范圍:" + this.beginIp + "-"?
??????????????? + this.endIp;??
??? }??
}?
package com.ip;
//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;
?public IPEntry() {
??beginIp = "";
??endIp = "";
??country = "";
??area = "";
?}
?@Override
?public String toString() {
??return this.area + "? " + this.country + "? IP范圍:" + this.beginIp + "-"
????+ this.endIp;
?}
}
?
引用 收藏?
?lgl669 2009-06-24
Java代碼?
?
package com.ip;??
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;??
?
/**?
?* <pre>?
?* 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?
?* </pre>?
?*??
?*/?
public class IPSeeker {??
??? /**?
???? * <pre>?
???? * 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?
???? * </pre>?
???? */?
??? 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 final 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 final IPLocation loc;??
??? private final byte[] buf;??
??? private final byte[] b4;??
??? private final 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();??
??? }??
}?
package com.ip;
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;
/**
?* <pre>
?* 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
?* </pre>
?*
?*/
public class IPSeeker {
?/**
? * <pre>
? * 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
? * </pre>
? */
?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 final 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 final IPLocation loc;
?private final byte[] buf;
?private final byte[] b4;
?private final 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();
?}
}
引用 收藏?
?lgl669 2009-06-24
Java代碼?
?
package com.ip;??
?
import java.io.UnsupportedEncodingException;??
?
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;??
??? }??
?
??? /**?
???? * 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();??
??? }??
}?
package com.ip;
import java.io.UnsupportedEncodingException;
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;
?}
?/**
? * 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();
?}
}
引用 收藏?
?lgl669 2009-06-24
package com;
import com.ip.IPSeeker;
public class TestIP {
public static void main(String[] args) {
IPSeeker seeker = IPSeeker.getInstance();
String ip ="222.222.137.194";//放入要測試的ip地址
String ip1="116.233.156.204";
??????? System.out.println(seeker.getAddress(ip1));
}
}
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