LumaQQ与IP查询二（转）

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Cache 数据结构 J#Google subversion

下面是改进了一点点的版本：

1 IPSeeker.java

package com.worthtech.app.util.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. &quot;结束地址/国家/区域&quot;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. &quot;起始地址/结束地址偏移&quot;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
 * </pre>
 * 
 * @author 马若劼
 */
public class IPSeeker {
	/**
	 * <pre>
	 * 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
	 * </pre>
	 * 
	 * @author 马若劼
	 */
	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;

	// 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 final Hashtable ipCache;
	// 随机文件访问类
	private RandomAccessFile ipFile;
	// 内存映射文件
	private MappedByteBuffer mbb;
	// 单一模式实例
	private static IPSeeker instance = new IPSeeker();
	// 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 final IPLocation loc;
//	private final byte[] buf;//不需要了
	private final byte[] b4;
	private final byte[] b3;

	/**
	 * 私有构造函数
	 */
	private IPSeeker() {
		ipCache = new Hashtable();
		loc = new IPLocation();
//		buf = new byte[100];//不需要了，这里初始化不好!
		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地址信息文件没有找到，IP显示功能将无法使用");
			ipFile = null;

		}
		// 如果打开文件成功，读取文件头信息
		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错误，IP显示功能将无法使用");
				ipFile = null;
			}
		}
	}

	/**
	 * @return 单一实例
	 */
	public static IPSeeker getInstance() {
		return instance;
	}

	/**
	 * 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 getIPEntriesDebug(String s) {
		List ret = new ArrayList();
		long endOffset = ipEnd + 4;
		for (long offset = ipBegin + 4; offset <= endOffset; offset += IP_RECORD_LENGTH) {
			// 读取结束IP偏移
			long temp = readLong3(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 = Util.getIpStringFromBytes(b4);
					// 得到结束IP
					readIP(temp, b4);
					entry.endIp = Util.getIpStringFromBytes(b4);
					// 添加该记录
					ret.add(entry);
				}
			}
		}
		return ret;
	}

	/**
	 * 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 getIPEntries(String s) {
		List ret = new ArrayList();
		try {
			// 映射IP信息文件到内存中
			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 = Util.getIpStringFromBytes(b4);
						// 得到结束IP
						readIP(temp, b4);
						entry.endIp = Util.getIpStringFromBytes(b4);
						// 添加该记录
						ret.add(entry);
					}
				}
			}
		} catch (IOException e) {
			System.out.println(e.getMessage());
		}
		return ret;
	}

	/**
	 * 从内存映射文件的offset位置开始的3个字节读取一个int
	 * 
	 * @param offset
	 * @return
	 */
	private int readInt3(int offset) {
		mbb.position(offset);
		return mbb.getInt() & 0x00FFFFFF;
	}

	/**
	 * 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;
	}

	/**
	 * 根据IP得到国家名
	 * 
	 * @param ip
	 *            ip的字节数组形式
	 * @return 国家名字符串
	 */
	public String getCountry(byte[] ip) {
		// 检查ip地址文件是否正常
		if (ipFile == null)
			return "错误的IP数据库文件";
		// 保存ip，转换ip字节数组为字符串形式
		String ipStr = Util.getIpStringFromBytes(ip);
		// 先检查cache中是否已经包含有这个ip的结果，没有再搜索文件
		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) {
		return getCountry(Util.getIpByteArrayFromString(ip));
	}

	/**
	 * 根据IP得到地区名
	 * 
	 * @param ip
	 *            ip的字节数组形式
	 * @return 地区名字符串
	 */
	public String getArea(byte[] ip) {
		// 检查ip地址文件是否正常
		if (ipFile == null)
			return "错误的IP数据库文件";
		// 保存ip，转换ip字节数组为字符串形式
		String ipStr = Util.getIpStringFromBytes(ip);
		// 先检查cache中是否已经包含有这个ip的结果，没有再搜索文件
		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) {
		return getArea(Util.getIpByteArrayFromString(ip));
	}

	/**
	 * 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;
		long offset = locateIP(ip);
		if (offset != -1)
			info = getIPLocation(offset);
		if (info == null) {
			info = new IPLocation();
			info.country = "未知国家";
			info.area = "未知地区";
		}
		return info;
	}

	/**
	 * 从offset位置读取4个字节为一个long，因为java为big-endian格式，所以没办法 用了这么一个函数来做转换
	 * 
	 * @param offset
	 * @return 读取的long值，返回-1表示读取文件失败
	 */
	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;
		}
	}

	/**
	 * 从offset位置读取3个字节为一个long，因为java为big-endian格式，所以没办法 用了这么一个函数来做转换
	 * 
	 * @param offset
	 * @return 读取的long值，返回-1表示读取文件失败
	 */
	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;
		}
	}

	/**
	 * 从当前位置读取3个字节转换成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;
		}
	}

	/**
	 * 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(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());
		}
	}

	/**
	 * 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 long locateIP(byte[] ip) {
		long m = 0;
		int r;
		// 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 (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 = 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偏移中间位置记录的偏移
	 * 
	 * @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;
	}

	/**
	 * 给定一个ip国家地区记录的偏移，返回一个IPLocation结构
	 * 
	 * @param offset
	 * @return
	 */
	private IPLocation getIPLocation(long offset) {
		try {
			// 跳过4字节ip
			ipFile.seek(offset + 4);
			// 读取第一个字节判断是否标志字节
			byte b = ipFile.readByte();
			if (b == AREA_FOLLOWED) {
				// 读取国家偏移
				long countryOffset = readLong3();
				// 跳转至偏移处
				ipFile.seek(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 = ipFile.readByte();
				if (b == NO_AREA) {
					loc.country = readString(readLong3());
					ipFile.seek(countryOffset + 4);
				} else
					loc.country = readString(countryOffset);
				// 读取地区标志
				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;
	}

	/**
	 * 从offset偏移开始解析后面的字节，读出一个地区名
	 * 
	 * @param offset
	 * @return 地区名字符串
	 * @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 "未知地区";
			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 "未知地区";
			else
				return readString(areaOffset);
		} else
			return readString(offset);
	}

	/**
	 * 从offset偏移处读取一个以0结束的字符串
	 * 
	 * @param offset
	 * @return 读取的字符串，出错返回空字符串
	 */
	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());
			//上面的写法读取数据如果超过100个字节就会报数组越界异常
			int i = 0;
			byte[] buf = new byte[256];
			while ((buf[i] = ipFile.readByte()) != 0) {
			    ++ i;
			    if (i >= buf.length) {
			        byte[] tmp = new byte[i + 100];
			        System.arraycopy(buf, 0, tmp, 0, i);
			        buf = tmp;
			    }
			}
			/////////
			if (i != 0)
				return Util.getString(buf, 0, i, "GBK");
		} catch (IOException e) {
			System.out.println(e.getMessage());
		}
		return "";
	}

	/**
	 * 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 {
			mbb.position(offset);
			//int i;
			//for (i = 0, buf[i] = mbb.get(); buf[i] != 0; buf[++i] = mbb.get());
			int i = 0;
			byte[] buf = new byte[256];
			while ((buf[i] = mbb.get()) != 0) {
			    ++ i;
			    if (i >= buf.length) {
			        byte[] tmp = new byte[i + 100];
			        System.arraycopy(buf, 0, tmp, 0, i);
			        buf = tmp;
			    }
			}
			if (i != 0)
				return Util.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();		
	}
	
	
	
	public static void main(String[] args) {
        IPSeeker ipseeker = IPSeeker.getInstance();   
        String sip[] = { "60.177.69.138", "124.91.62.239", "124.91.62.239",   
                "59.40.87.8", "221.222.73.88", "60.51.114.120",   
                "222.212.223.146", "60.51.114.120", "60.51.114.120",   
                "60.51.114.120", "60.51.114.120", "211.99.23.121",   
                "58.45.85.107", "58.45.85.107", "121.32.94.204",   
                "117.22.46.178", "218.19.2.195", "58.218.23.10",   
                "58.218.23.10", "202.173.10.2", "60.178.167.241",   
                "58.213.137.5", "58.38.165.221", "58.38.165.221",   
                "61.150.15.25", "58.45.82.76", "218.8.200.210", "59.33.24.233",   
                "60.176.240.196", "60.9.86.85", "60.51.114.120",   
                "60.51.114.120", "125.120.155.45", "219.140.61.180",   
                "219.140.61.180", "59.49.158.100", "59.49.158.100",   
                "58.218.23.10", "221.220.25.54", "222.71.176.119",   
                "220.168.115.124", "58.38.165.221", "218.3.251.246",   
                "58.213.137.5", "218.3.251.246", "121.33.219.235",   
                "222.130.195.225", "60.51.114.120", "218.3.251.246",   
                "219.140.61.180", "219.140.61.180", "125.120.155.45",   
                "60.9.97.186", "124.228.44.177", "218.19.2.195",   
                "222.70.225.180", "58.38.165.221", "58.38.165.221",   
                "60.168.67.99", "58.38.165.221", "58.38.165.221",   
                "61.29.214.76", "220.234.156.254", "60.51.114.120",   
                "60.51.114.120", "60.51.114.120", "222.168.148.111",   
                "117.24.28.13", "59.49.158.100", "60.209.253.61",   
                "61.150.15.83", "60.208.156.110", "124.227.192.131",   
                "125.120.155.90", "218.83.58.250", "60.191.89.102",   
                "222.71.176.119", "60.178.167.241", "60.208.111.203",   
                "222.74.231.66", "58.221.253.118", "122.89.146.55",   
                "60.51.114.120", "58.221.253.118", "59.49.158.100",   
                "218.10.158.162", "220.160.38.98", "124.227.192.131",   
                "219.245.44.214", "211.158.41.214", "219.245.44.185",   
                "218.0.113.43", "211.158.41.214", "218.68.82.73",   
                "125.120.144.14", "125.120.155.90", "60.171.169.251",   
                "124.78.165.8", "124.78.165.8", "218.22.186.125",
                "202.98.224.68","218.21.40.190","218.202.208.0",
                "58.18.118.0","218.21.68.175"};
        for (int i = 0; i < sip.length; i++) {
        	//较详细的信息：
//          System.out.println(ipseeker.getAddress(sip[i]));
        	//只打印国家省份信息:
        	System.out.println(ipseeker.getCountry(sip[i]));
        }   
   
    }   
}

2 IPEntry.java

/*
* 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
*/
package com.worthtech.app.util.ip;


/**
 * <pre>
 * 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
 * </pre>
 * 
 * @author luma
 */
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 = "";
    }
}

3 Util.java

package com.worthtech.app.util.ip;


import java.io.UnsupportedEncodingException;
import java.util.StringTokenizer;

import org.apache.log4j.Level;

import  com.showtime.util.LogFactory;



/**
 * 工具类，提供一些方便的方法
 */
public class Util {
	
	private static StringBuilder sb = new StringBuilder();
	/**
     * 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
     */
    public static byte[] getIpByteArrayFromString(String ip) {
        byte[] ret = new byte[4];
        StringTokenizer st = new 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) {
          LogFactory.log("从ip的字符串形式得到字节数组形式报错", Level.ERROR, e);
        }
        return ret;
    }
    /**
     * @param ip ip的字节数组形式
     * @return 字符串形式的ip
     */
    public static String getIpStringFromBytes(byte[] ip) {
	    sb.delete(0, sb.length());
    	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();
    }
    
    /**
     * 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
     */
    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);
        }
    }
}

网上还有许多人在改进它，可以参照：

http://code.google.com/p/lumaqq4j/source/browse/trunk/lumaqq/src/edu/tsinghua/lumaqq/IPSeeker.java?r=4

http://kenai.com/projects/ipseeker/sources/subversion/show/IPSeeker

等，可以在google上输入ipseeker.java搜索它们来，改进上也没改进多少，可能就是一些小的地方。

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