说明：IP地址库来自QQwry.dat数据库文件，通过解析地址库当中的ip，已经细化最后获取的信息：获取ip地址对应的：国家 / 省 / 市 / 运营商ISP信息。
解析主要用到三个类：
(1) IPSeeker.java：通过IP地址查询解析相关信息
(2) SplitAddress.java：IPSeeker解析出的完整信息做进一步切分，划分为0级地址（国家/省）、1级地址（市级）、2级地址（区）、运营商ISP信息。
(3) IPEntity.java：定义的实体字段，包括nation、province、city、region.
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(1) IPSeeker.java
import java.io.File; import java.io.IOException; import java.io.RandomAccessFile; import java.io.UnsupportedEncodingException; import java.nio.ByteOrder; import java.nio.MappedByteBuffer; import java.nio.channels.FileChannel; import java.util.ArrayList; import java.util.HashMap; import java.util.List;import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; public class IPSeeker{private Log log = LogFactory.getLog(IPSeeker.class);//:::::::::::: Class IPLocation ::::::::::::::::::::://public class IPLocation{//:::::::::::: Fields :::::::::::::://private String country; //完全地址:省/市/区private String isp;//使用的网络(运营商ISP)//:::::::::::: Province ::::::::::::://public String getCountry() {return country;}public void setCountry(String country) {this.country = country;}public String getIsp(){if("CZ88.NET".equals(isp)){isp = ""; }return isp;}public void setIsp(String isp){this.isp = isp;}//::::::::: Class Constructor ::::::::::::://public IPLocation(){isp = "";country = "";}public IPLocation getCopy(){IPLocation ret = new IPLocation();ret.country = country;ret.isp = isp;return ret;}}//:::::::::::: Class IPEntry ::::::::::::::::::::://public class IPEntry{public String beginIp;public String endIp;public String country;public String isp;public IPEntry(){beginIp = endIp = country = isp = "";}@Overridepublic String toString(){return this.isp+" "+this.country+"IP范围:"+this.beginIp+"-"+this.endIp;}}//一些固定常量，比如记录长度等private static final int IP_RECORD_LENGTH = 7;private static final byte isp_FOLLOWED = 0x01;private static final byte NO_isp = 0x2;// 用来做为cache，查询一个ip时首先查看cache，以减少不必要的重复查找private MappedByteBuffer mbb;// 随机文件访问类private RandomAccessFile ipFile;// 内存映射文件private HashMap<String, IPLocation> ipCache;// 起始地区的开始和结束的绝对偏移private int ipBegin, ipEnd;public IPSeeker(File ipFile) throws Exception{this.ipFile = new RandomAccessFile(ipFile, "r");ipCache = new HashMap<String, IPLocation>();FileChannel fc = this.ipFile.getChannel();mbb = fc.map(FileChannel.MapMode.READ_ONLY, 0, ipFile.length());mbb.order(ByteOrder.LITTLE_ENDIAN);ipBegin = readInt(0);ipEnd = readInt(4);if(ipBegin==-1 || ipEnd==-1){throw new IOException("IP地址信息文件格式有错误，IP显示功能将无法使用");}log.debug("使用IP地址库:"+ipFile.getAbsolutePath());}/*** 给定一个ip 得到一个 ip地址信息* @param ip* @return*/public String getAddress(String ip){return getCountry(ip) + " " + getIsp(ip);}/*** 根据IP得到国家名* @param ip IP的字符串形式* @return 国家名字符串*/public String getCountry(String ip){IPLocation cache = getIpLocation(ip);return cache.getCountry();}/*** 根据IP得到地区名* @param ip IP的字符串形式* @return 地区名字符串*/public String getIsp(String ip){IPLocation cache = getIpLocation(ip);return cache.getIsp();}public IPLocation getIpLocation(String ip){IPLocation ipLocation = null;try {if(ipCache.get(ip)!=null){return ipCache.get(ip);}ipLocation = getIPLocation(getIpByteArrayFromString(ip));if(ipLocation!=null){ipCache.put(ip, ipLocation);}} catch (Exception e) {log.error(e);}if(ipLocation==null){ipLocation = new IPLocation();ipLocation.setCountry("未知国家");ipLocation.setIsp("未知地区");}return ipLocation;}/*** 给定一个地点的不完全名字，得到一系列包含s子串的IP范围记录* @param s 地点子串* @return 包含IPEntry类型的List*/public List<IPEntry> getIPEngries(String s){List<IPEntry> ret = new ArrayList<IPEntry>();byte[] b4=new byte[4];int endOffset = ipEnd + 4;for(int offset=ipBegin+4; offset<=endOffset; offset+=IP_RECORD_LENGTH){//读取结束IP偏移int temp = readInt3(offset);// 如果temp不等于-1，读取IP的地点信息if(temp!=-1){IPLocation loc = getIPLocation(temp);// 判断是否这个地点里面包含了s子串，如果包含了，添加这个记录到List中，如果没有，继续if (loc.country.indexOf(s) != -1 || loc.isp.indexOf(s) != -1) {IPEntry entry = new IPEntry();entry.country = loc.country;entry.isp = loc.isp;// 得到起始IPreadIP(offset – 4, b4);entry.beginIp = getIpStringFromBytes(b4);// 得到结束IPreadIP(temp, b4);entry.endIp = getIpStringFromBytes(b4);// 添加该记录ret.add(entry);}}}return ret;}/*** 根据ip搜索ip信息文件，得到IPLocation结构，所搜索的ip参数从类成员ip中得到* @param ip 要查询的IP* @return IPLocation结构*/private IPLocation getIPLocation(byte[] ip){IPLocation info = null;int offset = locateIP(ip);if (offset != -1) {info = getIPLocation(offset);}return info;}//———以下为内部方法————-///*** 读取4个字节* @param offset* @return*/private int readInt(int offset) {mbb.position(offset);return mbb.getInt();}private int readInt3(int offset) {mbb.position(offset);return mbb.getInt() & 0x00FFFFFF;}/*** 从内存映射文件的offset位置得到一个0结尾字符串* @param offset* @return*/private String readString(int offset) {try {byte[] buf=new byte[100];mbb.position(offset);int i;for (i = 0, buf[i] = mbb.get(); buf[i] != 0; buf[++i] = mbb.get()) {}if (i != 0) {return getString(buf, 0, i, "GBK");}}catch (IllegalArgumentException e){log.error(e);}return "";}/*** 从offset位置读取四个字节的ip地址放入ip数组中，读取后的ip为big-endian格式，但是* 文件中是little-endian形式，将会进行转换* @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;}/*** 把类成员ip和beginIp比较，注意这个beginIp是big-endian的* @param ip 要查询的IP* @param beginIp 和被查询IP相比较的IP* @return 相等返回0，ip大于beginIp则返回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;}/*** 把两个byte当作无符号数进行比较* @param b1* @param b2* @return 若b1大于b2则返回1，相等返回0，小于返回-1*/private int compareByte(byte b1, byte b2) {if ((b1 & 0xFF) > (b2 & 0xFF)){ //比较是否大于return 1;}else if((b1^b2)==0){ //判断是否相等return 0;}else{return -1;}}/*** 这个方法将根据ip的内容，定位到包含这个ip国家地区的记录处，返回一个绝对偏移* 方法使用二分法查找。* @param ip 要查询的IP* @return 如果找到了，返回结束IP的偏移，如果没有找到，返回-1*/private int locateIP(byte[] ip) {int m = 0;int r;byte[] b4=new byte[4];// 比较第一个ip项readIP(ipBegin, b4);r = compareIP(ip, b4);if (r == 0) {return ipBegin;} else if (r < 0) {return -1;}// 开始二分搜索for (int 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 readInt3(m + 4);}}// 如果循环结束了，那么i和j必定是相等的，，这个记录为最可能的记录，但是并非// 肯定就是，还要检查一下，如果是，就返回结束地址区的绝对偏移m = readInt3(m + 4);readIP(m, b4);r = compareIP(ip, b4);if (r <= 0) {return m;} else {return -1;}}/*** 得到begin偏移和end偏移中间位置记录的偏移* @param begin* @param end* @return*/private int getMiddleOffset(int begin, int end) {int records = (end – begin) / IP_RECORD_LENGTH;records >>= 1;if (records == 0) {records = 1;}return begin + records * IP_RECORD_LENGTH;}/*** @param offset* @return*/private IPLocation getIPLocation(int offset) {IPLocation loc = new IPLocation();// 跳过4字节ipmbb.position(offset + 4);// 跳过4字节ipbyte b = mbb.get();if (b == isp_FOLLOWED) {// 读取国家偏移int countryOffset = readInt3();// 跳转至偏移处mbb.position(countryOffset);// 再检查一次标志字节，因为这个时候这个地方仍然可能是个重定向b = mbb.get();if (b == NO_isp) {loc.country = readString(readInt3());mbb.position(countryOffset + 4);} else {loc.country = readString(countryOffset);}// 读取地区标志loc.isp = readisp(mbb.position());} else if (b == NO_isp) {loc.country = readString(readInt3());loc.isp = readisp(offset + 8);} else {loc.country = readString(mbb.position() – 1);loc.isp = readisp(mbb.position());}return loc;}/*** @param offset* @return*/private String readisp(int offset) {mbb.position(offset);byte b = mbb.get();if (b == 0x01 || b == 0x02){int ispOffset = readInt3();if(ispOffset == 0){return "未知地区";}else{return readString(ispOffset);}}else{return readString(offset);}}/*** 从内存映射文件的当前位置开始的3个字节读取一个int* @return*/private int readInt3(){return mbb.getInt() & 0x00FFFFFF;}/*** 从ip的字符串形式得到字节数组形式：字符串序列化为二进制文件* @param ip 字符串形式的ip* @return 字节数组形式的ip*/private static byte[] getIpByteArrayFromString(String ip) throws Exception{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){throw e;}return ret;}/*** 根据某种编码方式将字节数组转换成字符串* @param b 字节数组* @param offset 要转换的起始位置* @param len 要转换的长度* @param encoding 编码方式* @return 如果encoding不支持，返回一个缺省编码的字符串*/private 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的字节数组形式* @return 字符串形式的ip*/private 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();}}转动心中的期待，血在澎湃，吃苦流汗算什么。
