Java tutorial
package com.topsem.common.net; /* * LumaQQ - Java QQ Client * * Copyright (C) 2004 luma < stubma@163.com> * * 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 org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; 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; /** * * ??QQwry.dat?ip??QQwry.dat? * . 8 * 1. IP??? 4 * 2. ?IP??? 4 * . "??//" * ip????? * 1. * 2. * ??? * 1. 0? * 2. 4?0x10x2 * a. 0x1???????????? * b. 0x2???? * ?0x10x2?????? * 0x10x2???3??? * 0 * . "?/????" * 1. ??7?? * a. IP?4 * b. ?ip????3 * * ?ip?????little-endian?java * big-endian???? * * * @author * * IP? * */ public class IPSeeker { private Log log = LogFactory.getLog(IPSeeker.class); /** * ??ip???ip * @author */ 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; } } /** * * ?IP?IP?IP * * @author */ 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:" + this.beginIp + "-" + this.endIp; } } // ? private static final int IP_RECORD_LENGTH = 7; private static final byte AREA_FOLLOWED = 0x01; private static final byte NO_AREA = 0x2; // ,??IO ? private MappedByteBuffer mbb; // ? private RandomAccessFile ipFile; // ??cacheipcache????? private HashMap<String, IPLocation> ipCache; // ???? 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???IP"); } log.debug("IP?:" + ipFile.getAbsolutePath()); } /** * ip ip?? * @param ip * @return */ public String getAddress(String ip) { return getCountry(ip) + " " + getArea(ip); } /** * ?IP?? * @param ip IP? * @return ?? */ public String getCountry(String ip) { IPLocation cache = getIpLocation(ip); return cache.getCountry(); } /** * ?IP?? * @param ip IP? * @return ?? */ public String getArea(String ip) { IPLocation cache = getIpLocation(ip); return cache.getArea(); } /** * IP?? * @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(""); ipLocation.setArea(""); } return ipLocation; } /** * ????s?IP * @param s ? * @return ?IPEntryList */ 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) { // ??IP?? int temp = readInt3(offset); // temp?-1?IP? if (temp != -1) { IPLocation loc = getIPLocation(temp); // ???s??List if (loc.country.indexOf(s) != -1 || loc.area.indexOf(s) != -1) { IPEntry entry = new IPEntry(); entry.country = loc.country; entry.area = loc.area; // IP readIP(offset - 4, b4); entry.beginIp = getIpStringFromBytes(b4); // ?IP readIP(temp, b4); entry.endIp = getIpStringFromBytes(b4); // ret.add(entry); } } } return ret; } /** * ?ip?ip?IPLocation?ip??ip * @param ip ?IP * @return IPLocation */ private IPLocation getIPLocation(byte[] ip) { IPLocation info = null; int offset = locateIP(ip); if (offset != -1) { info = getIPLocation(offset); } return info; } //----------------- /** * ?4 * @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; } /** * offset?0 * @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 ""; } /** * offset??ip?ip??ipbig-endian? * little-endian?? * @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; } /** * ?ipbeginIp?beginIpbig-endian * @param ip ?IP * @param beginIp IPIP * @return 0ipbeginIp1?-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; } /** * byte? * @param b1 * @param b2 * @return b1b210?-1 */ private int compareByte(byte b1, byte b2) { if ((b1 & 0xFF) > (b2 & 0xFF)) // ? { return 1; } else if ((b1 ^ b2) == 0)// ? { return 0; } else { return -1; } } /** * ?ip??ip??? * * @param ip ?IP * @return ?IP??-1 */ private int locateIP(byte[] ip) { int m = 0; int r; byte[] b4 = new byte[4]; // ip readIP(ipBegin, b4); r = compareIP(ip, b4); if (r == 0) { return ipBegin; } else if (r < 0) { return -1; } // ? 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); } } // ?ij?? // ?????? m = readInt3(m + 4); readIP(m, b4); r = compareIP(ip, b4); if (r <= 0) { return m; } else { return -1; } } /** * begin??end????? * @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(); // 4ip mbb.position(offset + 4); // ?? byte b = mbb.get(); if (b == AREA_FOLLOWED) { // ??? int countryOffset = readInt3(); // ?? mbb.position(countryOffset); // ????? b = mbb.get(); if (b == NO_AREA) { loc.country = readString(readInt3()); mbb.position(countryOffset + 4); } else { loc.country = readString(countryOffset); } // ? 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 ""; } else { return readString(areaOffset); } } else { return readString(offset); } } /** * ??3?int * @return */ private int readInt3() { return mbb.getInt() & 0x00FFFFFF; } /** * ip?? * @param ip ?ip * @return ?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; } /** * ??????? * @param b * @param offset ??? * @param len ?? * @param encoding ?? * @return encoding???? */ 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? * @return ?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(); } //? // public static void main(String[] args) { // try { // String rootPath = IPSeeker.class.getResource("/").getPath(); // IPSeeker ipSeeker = new IPSeeker(new File(rootPath + "QQWry.dat")); // IPLocation ipLocation = ipSeeker.getIpLocation("121.8.243.50"); // System.out.println(ipSeeker.getAddress("121.8.243.50")); // } catch (Exception e) { // e.printStackTrace(); // } // } }