import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Arrays;
import java.nio.charset.Charset;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;
public class IPExt {
public static void main(String[] args) {
IPExt.load("H:\\loveapp\\codebase\\17mon\\17monipdb.datx");
System.out.println(Arrays.toString(IPExt.find("8.8.8.8")));
System.out.println(Arrays.toString(IPExt.find("118.28.8.8")));
System.out.println(Arrays.toString(IPExt.find("255.255.255.255")));
}
public static boolean enableFileWatch = false;
private static int offset;
private static int[] index = new int[65536];
private static ByteBuffer dataBuffer;
private static ByteBuffer indexBuffer;
private static Long lastModifyTime = 0L;
private static File ipFile ;
private static ReentrantLock lock = new ReentrantLock();
public static void load(String filename) {
ipFile = new File(filename);
load();
if (enableFileWatch) {
watch();
}
}
public static void load(String filename, boolean strict) throws Exception {
ipFile = new File(filename);
if (strict) {
int contentLength = Long.valueOf(ipFile.length()).intValue();
if (contentLength < 512 * 1024) {
throw new Exception("ip data file error.");
}
}
load();
if (enableFileWatch) {
watch();
}
}
public static String[] find(String ip) {
String[] ips = ip.split("\\.");
int prefix_value = (Integer.valueOf(ips[0]) * 256 + Integer.valueOf(ips[1]));
long ip2long_value = ip2long(ip);
int start = index[prefix_value];
int max_comp_len = offset - 262144 - 4;
long tmpInt;
long index_offset = -1;
int index_length = -1;
byte b = 0;
for (start = start * 9 + 262144; start < max_comp_len; start += 9) {
tmpInt = int2long(indexBuffer.getInt(start));
if (tmpInt >= ip2long_value) {
index_offset = bytesToLong(b, indexBuffer.get(start + 6), indexBuffer.get(start + 5), indexBuffer.get(start + 4));
index_length = ((0xFF & indexBuffer.get(start + 7)) << 8) + (0xFF & indexBuffer.get(start + 8));
break;
}
}
byte[] areaBytes;
lock.lock();
try {
dataBuffer.position(offset + (int) index_offset - 262144);
areaBytes = new byte[index_length];
dataBuffer.get(areaBytes, 0, index_length);
} finally {
lock.unlock();
}
return new String(areaBytes, Charset.forName("UTF-8")).split("\t", -1);
}
private static void watch() {
Executors.newScheduledThreadPool(1).scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
long time = ipFile.lastModified();
if (time > lastModifyTime) {
load();
}
}
}, 1000L, 5000L, TimeUnit.MILLISECONDS);
}
private static void load() {
lastModifyTime = ipFile.lastModified();
lock.lock();
try {
dataBuffer = ByteBuffer.wrap(getBytesByFile(ipFile));
dataBuffer.position(0);
offset = dataBuffer.getInt(); // indexLength
byte[] indexBytes = new byte[offset];
dataBuffer.get(indexBytes, 0, offset - 4);
indexBuffer = ByteBuffer.wrap(indexBytes);
indexBuffer.order(ByteOrder.LITTLE_ENDIAN);
for (int i = 0; i < 256; i++) {
for (int j = 0; j < 256; j++) {
index[i * 256 + j] = indexBuffer.getInt();
}
}
indexBuffer.order(ByteOrder.BIG_ENDIAN);
} finally {
lock.unlock();
}
}
private static byte[] getBytesByFile(File file) {
FileInputStream fin = null;
byte[] bs = new byte[new Long(file.length()).intValue()];
try {
fin = new FileInputStream(file);
int readBytesLength = 0;
int i;
while ((i = fin.available()) > 0) {
fin.read(bs, readBytesLength, i);
readBytesLength += i;
}
} catch (IOException ioe) {
ioe.printStackTrace();
} finally {
try {
if (fin != null) {
fin.close();
}
} catch (IOException e){
e.printStackTrace();
}
}
return bs;
}
private static long bytesToLong(byte a, byte b, byte c, byte d) {
return int2long((((a & 0xff) << 24) | ((b & 0xff) << 16) | ((c & 0xff) << 8) | (d & 0xff)));
}
private static int str2Ip(String ip) {
String[] ss = ip.split("\\.");
int a, b, c, d;
a = Integer.parseInt(ss[0]);
b = Integer.parseInt(ss[1]);
c = Integer.parseInt(ss[2]);
d = Integer.parseInt(ss[3]);
return (a << 24) | (b << 16) | (c << 8) | d;
}
private static long ip2long(String ip) {
return int2long(str2Ip(ip));
}
private static long int2long(int i) {
long l = i & 0x7fffffffL;
if (i < 0) {
l |= 0x080000000L;
}
return l;
}
}