改自网上现有的java解析程序
1. 因为java 的int 本来就是32位的,所以不需要long,
2. 把相关的类都集成到一起
3. 采用 MappedByteBuffer 提高io效率
package projects.common.ip.support; /* * LumaQQ - Java QQ Client * * Copyright (C) 2004 luma < [email protected]> * * 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.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; /** * * 用来读取QQwry.dat文件,以根据ip获得好友位置,QQwry.dat的格式是 * 一. 文件头,共8字节 * 1. 第一个起始IP的绝对偏移, 4字节 * 2. 最后一个起始IP的绝对偏移, 4字节 * 二. "结束地址/国家/区域"记录区 * 四字节ip地址后跟的每一条记录分成两个部分 * 1. 国家记录 * 2. 地区记录 * 但是地区记录是不一定有的。而且国家记录和地区记录都有两种形式 * 1. 以0结束的字符串 * 2. 4个字节,一个字节可能为0x1或0x2 * a. 为0x1时,表示在绝对偏移后还跟着一个区域的记录,注意是绝对偏移之后,而不是这四个字节之后 * b. 为0x2时,表示在绝对偏移后没有区域记录 * 不管为0x1还是0x2,后三个字节都是实际国家名的文件内绝对偏移 * 如果是地区记录,0x1和0x2的含义不明,但是如果出现这两个字节,也肯定是跟着3个字节偏移,如果不是 * 则为0结尾字符串 * 三. "起始地址/结束地址偏移"记录区 * 1. 每条记录7字节,按照起始地址从小到大排列 * a. 起始IP地址,4字节 * b. 结束ip地址的绝对偏移,3字节 * * 注意,这个文件里的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,要注意转换 * * * @author 马若劼 * * 改进,IP地址热部署 * 啊赶 */ public class IPSeeker { private Log log = LogFactory.getLog(IPSeeker.class); /** * 用来封装ip相关信息,目前只有两个字段,ip所在的国家和地区 * @author 马若劼 */ public class IPLocation { private String country; private String area; public String getArea() { if (" CZ88.NET".equals(area)) { area = ""; } return area; } public void setArea(String area) { this.area = area; } public String getCountry() { if (" CZ88.NET".equals(country)) { country = ""; } return country; } public void setCountry(String country) { this.country = country; } public IPLocation() { area = ""; country = ""; } public IPLocation getCopy() { IPLocation ret = new IPLocation(); ret.country = country; ret.area = area; return ret; } } /** * * 一条IP范围记录,不仅包括国家和区域,也包括起始IP和结束IP * * @author 马若劼 */ public class IPEntry { public String beginIp; public String endIp; public String country; public String area; /** * 构造函数 */ public IPEntry() { beginIp = endIp = country = area = ""; } @Override public String toString() { return this.area + " " + this.country + "IP范围:" + this.beginIp + "-" + this.endIp; } } // 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 AREA_FOLLOWED = 0x01; private static final byte NO_AREA = 0x2; // 内存映射文件,提高IO 读取效率 private MappedByteBuffer mbb; // 随机文件访问类 private RandomAccessFile ipFile; // 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 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) + " " + getArea(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 getArea(String ip) { IPLocation cache = getIpLocation(ip); return cache.getArea(); } /** * 获得一个IP地址信息 * @param ip * @return */ 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.setArea("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> getIPEntries(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.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 = getIpStringFromBytes(b4); // 得到结束IP readIP(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ip mbb.position(offset + 4); // 读取第一个字节判断是否标志字节 byte b = mbb.get(); if (b == AREA_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_AREA) { loc.country = readString(readInt3()); mbb.position(countryOffset + 4); } else { loc.country = readString(countryOffset); } // 读取地区标志 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; } /** * @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 "未知地区"; } else { return readString(areaOffset); } } 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 * @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(); } //简单测试 public static void main(String[] args) { try { IPSeeker ipSeeker = new IPSeeker(new File("c:/QQWry.dat")); System.out.println(ipSeeker.getAddress("192.168.199.1")); } catch (Exception e) { e.printStackTrace(); } } }