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介绍通过IP地址查找ip具体的城市和运营商！
通过QQIP地址库：QQWry.Dat编写
以下只贴出少量代码，请各位直接到本人的网盘下载完整版（代码+最新QQWry.Dat），项目可直接运行！
QQWry.Dat大小为8.79M，项目大小仅390k，直接运行IPTest.java类即可！
此代码可用于各种java项目和jsp、j2ee项目
注意：QQWry.Dat只需文件放在对应的目录下即可。
网盘下载地址：http://115.com/file/dplk9jqn#
- public?class?IPSeeker?{??
- ????//纯真IP数据库名??
- ????private?String?IP_FILE="QQWry.Dat";??
- ????//保存的文件夹??
- ????private?String?INSTALL_DIR="f:/qqwry";??
- ??????
- ??????
- ????//?一些固定常量，比如记录长度等等??
- ????private?static?final?int?IP_RECORD_LENGTH?=?7;??
- ????private?static?final?byte?REDIRECT_MODE_1?=?0x01;??
- ????private?static?final?byte?REDIRECT_MODE_2?=?0x02;??
- ??????
- ????//?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?Map<String,?IPLocation>?ipCache;??
- ????//?随机文件访问类??
- ????private?RandomAccessFile?ipFile;??
- ????//?内存映射文件??
- ????private?MappedByteBuffer?mbb;??
- ????//?起始地区的开始和结束的绝对偏移??
- ????private?long?ipBegin,?ipEnd;??
- ????//?为提高效率而采用的临时变量??
- ????private?IPLocation?loc;??
- ????private?byte[]?buf;??
- ????private?byte[]?b4;??
- ????private?byte[]?b3;??
- ??????
- ????public?IPSeeker(String?fileName,String?dir)??{??
- ????????this.INSTALL_DIR=dir;??
- ????????this.IP_FILE=fileName;??
- ????????ipCache?=?new?HashMap<String,?IPLocation>();??
- ????????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)?{?
- ...........
- .............
- ................
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