return long2StringIP(readLong(4, indexBegin + middle * 7))+ ","//匹配到的IP地址(段)
+ result[0] + "," //国家
+ result[1];//地区
}
//32位整型格式的IP地址(little-endian)转化到字符串格式的IP地址
public static String long2StringIP(long ip)
{
long ip4 = ip >> 0 & 0x000000FF;
long ip3 = ip >> 8 & 0x000000FF;
long ip2 = ip >> 16 & 0x000000FF;
long ip1 = ip >> 24 & 0x000000FF;
return String.valueOf(ip1) + "." + String.valueOf(ip2) + "." +
String.valueOf(ip3) + "." + String.valueOf(ip4);
}
//字符串格式的IP地址转化到32位整型格式的IP地址(little-endian)
public static Long stringIP2Long(String ipStr) throws Exception
{
String[] list = ipStr.split("\\.");
if(list.length != 4)
{
throw new Exception("IP地址格式错误");
}
long ip = Long.parseLong(list[0]) << 24 & 0xFF000000;
ip += Long.parseLong(list[1]) << 16 & 0x00FF0000;
ip += Long.parseLong(list[2]) << 8 & 0x0000FF00;
ip += Long.parseLong(list[3]) << 0 & 0x000000FF;
return ip;
}
//读取一个n位的
private long readLong(int nByte, long offset) throws Exception
{
ipDataFile.seek(offset);
long result = 0;
if(nByte > 4 || nByte < 0)
throw new Exception("nBit should be 0-4");
for(int i = 0; i < nByte; i++)
{
result |= ((long)ipDataFile.readByte() << 8 * i) & (0xFFL << 8 * i);
}
return result;
}
private String[] getInfo(long itemStartPos) throws Exception
{
//result[0]放国家，result[1]放地区
String[] result = new String[2];
ipDataFile.seek(itemStartPos);
int mode = (int)ipDataFile.readByte();
switch (mode)
{
case MODE_1:
{
long offset = itemStartPos + 1;
long redirPos = readLong(3, offset);
result = getInfo(redirPos);
}
break;
case MODE_2:
{
long offset = itemStartPos + 1;
long redirPos = readLong(3, offset);
result = getInfo(redirPos);
result[1] = getArea(offset + 3);
}
break;
default://MODE_3
{
long offset = itemStartPos;
int countryLen = getStrLength(offset);
result[0] = getString(offset, countryLen);
offset = itemStartPos + countryLen + 1;
result[1] = getArea(offset);
}
break;
}
return result;
}
private String getArea(long offset) throws Exception
{
ipDataFile.seek(offset);
int cityMode = (int)ipDataFile.readByte();
if(cityMode == MODE_2 || cityMode == MODE_1)
{
offset = readLong(3, offset + 1);
}
int cityLen = getStrLength(offset);
return getString(offset, cityLen);
}
private int getStrLength(long pos) throws IOException
{
ipDataFile.seek(pos);
long strEnd = pos - 1;
while(ipDataFile.readByte() != (byte)0)
{
strEnd++;
}
return (int) (strEnd - pos + 1);
}
private String getString(long pos, int len) throws IOException
{
byte buf[] = new byte[len];
ipDataFile.seek(pos);
ipDa