diff --git a/binding/java/ReadMe.md b/binding/java/ReadMe.md
index 8f8e7fc..44231f4 100644
--- a/binding/java/ReadMe.md
+++ b/binding/java/ReadMe.md
@@ -15,35 +15,29 @@
```java
import org.lionsoul.ip2region.xdb.Searcher;
+
import java.io.*;
import java.util.concurrent.TimeUnit;
public class SearcherTest {
public static void main(String[] args) {
- // 1、创建 searcher 对象
String dbPath = "ip2region.xdb file path";
- Searcher searcher = null;
- try {
- searcher = Searcher.newWithFileOnly(dbPath);
- } catch (IOException e) {
- System.out.printf("failed to create searcher with `%s`: %s\n", dbPath, e);
- return;
- }
+ String ip = "1.2.3.4";
- // 2、查询
- try {
- String ip = "1.2.3.4";
+ // 1、创建 searcher 对象
+ try (Searcher searcher = Searcher.newWithFileOnly(dbPath)) {
+ // 2、查询
long sTime = System.nanoTime();
String region = searcher.search(ip);
- long cost = TimeUnit.NANOSECONDS.toMicros((long) (System.nanoTime() - sTime));
+ long cost = TimeUnit.NANOSECONDS.toMicros(System.nanoTime() - sTime);
System.out.printf("{region: %s, ioCount: %d, took: %d μs}\n", region, searcher.getIOCount(), cost);
+ } catch (IOException e) {
+ System.out.printf("failed to create searcher with `%s`: %s\n", dbPath, e);
} catch (Exception e) {
System.out.printf("failed to search(%s): %s\n", ip, e);
}
+ // 3、关闭资源（这里通过 try-with-resources 自动关闭）
- // 3、关闭资源
- searcher.close();
-
// 备注：并发使用，每个线程需要创建一个独立的 searcher 对象单独使用。
}
}
@@ -54,12 +48,14 @@ public class SearcherTest {
我们可以提前从 `xdb` 文件中加载出来 `VectorIndex` 数据，然后全局缓存，每次创建 Searcher 对象的时候使用全局的 VectorIndex 缓存可以减少一次固定的 IO 操作，从而加速查询，减少 IO 压力。
```java
import org.lionsoul.ip2region.xdb.Searcher;
+
import java.io.*;
import java.util.concurrent.TimeUnit;
public class SearcherTest {
public static void main(String[] args) {
String dbPath = "ip2region.xdb file path";
+ String ip = "1.2.3.4";
// 1、从 dbPath 中预先加载 VectorIndex 缓存，并且把这个得到的数据作为全局变量，后续反复使用。
byte[] vIndex;
@@ -71,27 +67,17 @@ public class SearcherTest {
}
// 2、使用全局的 vIndex 创建带 VectorIndex 缓存的查询对象。
- Searcher searcher;
- try {
- searcher = Searcher.newWithVectorIndex(dbPath, vIndex);
- } catch (Exception e) {
- System.out.printf("failed to create vectorIndex cached searcher with `%s`: %s\n", dbPath, e);
- return;
- }
-
- // 3、查询
- try {
- String ip = "1.2.3.4";
+ try (Searcher searcher = Searcher.newWithVectorIndex(dbPath, vIndex)) {
long sTime = System.nanoTime();
String region = searcher.search(ip);
- long cost = TimeUnit.NANOSECONDS.toMicros((long) (System.nanoTime() - sTime));
+ long cost = TimeUnit.NANOSECONDS.toMicros(System.nanoTime() - sTime);
System.out.printf("{region: %s, ioCount: %d, took: %d μs}\n", region, searcher.getIOCount(), cost);
+ } catch (IOException e) {
+ System.out.printf("failed to create vectorIndex cached searcher with `%s`: %s\n", dbPath, e);
} catch (Exception e) {
System.out.printf("failed to search(%s): %s\n", ip, e);
}
-
- // 4、关闭资源
- searcher.close();
+ // 3、关闭资源（这里通过 try-with-resources 自动关闭）
// 备注：每个线程需要单独创建一个独立的 Searcher 对象，但是都共享全局的制度 vIndex 缓存。
}
@@ -103,12 +89,14 @@ public class SearcherTest {
我们也可以预先加载整个 ip2region.xdb 的数据到内存，然后基于这个数据创建查询对象来实现完全基于文件的查询，类似之前的 memory search。
```java
import org.lionsoul.ip2region.xdb.Searcher;
+
import java.io.*;
import java.util.concurrent.TimeUnit;
public class SearcherTest {
public static void main(String[] args) {
String dbPath = "ip2region.xdb file path";
+ String ip = "1.2.3.4";
// 1、从 dbPath 加载整个 xdb 到内存。
byte[] cBuff;
@@ -123,22 +111,21 @@ public class SearcherTest {
Searcher searcher;
try {
searcher = Searcher.newWithBuffer(cBuff);
- } catch (Exception e) {
+ } catch (IOException e) {
System.out.printf("failed to create content cached searcher: %s\n", e);
return;
}
// 3、查询
try {
- String ip = "1.2.3.4";
long sTime = System.nanoTime();
String region = searcher.search(ip);
- long cost = TimeUnit.NANOSECONDS.toMicros((long) (System.nanoTime() - sTime));
+ long cost = TimeUnit.NANOSECONDS.toMicros(System.nanoTime() - sTime);
System.out.printf("{region: %s, ioCount: %d, took: %d μs}\n", region, searcher.getIOCount(), cost);
} catch (Exception e) {
System.out.printf("failed to search(%s): %s\n", ip, e);
}
-
+
// 4、关闭资源 - 该 searcher 对象可以安全用于并发，等整个服务关闭的时候再关闭 searcher
// searcher.close();
diff --git a/binding/java/pom.xml b/binding/java/pom.xml
index 43fe239..7ad2492 100644
--- a/binding/java/pom.xml
+++ b/binding/java/pom.xml
@@ -41,6 +41,7 @@
UTF-8
UTF-8
+ 1.8
1.6
1.6
@@ -112,6 +113,15 @@
+
+
+ org.apache.maven.plugins
+ maven-compiler-plugin
+
+ ${java.version}
+ ${java.version}
+
+
diff --git a/binding/java/src/main/java/org/lionsoul/ip2region/SearchTest.java b/binding/java/src/main/java/org/lionsoul/ip2region/SearchTest.java
index 5c70266..e139d57 100644
--- a/binding/java/src/main/java/org/lionsoul/ip2region/SearchTest.java
+++ b/binding/java/src/main/java/org/lionsoul/ip2region/SearchTest.java
@@ -8,7 +8,10 @@ package org.lionsoul.ip2region;
import org.lionsoul.ip2region.xdb.Searcher;
-import java.io.*;
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
import java.util.concurrent.TimeUnit;
public class SearchTest {
@@ -65,7 +68,7 @@ public class SearchTest {
}
}
- if (dbPath.length() < 1) {
+ if (dbPath.isEmpty()) {
System.out.print("java -jar ip2region-{version}.jar search [command options]\n");
System.out.print("options:\n");
System.out.print(" --db string ip2region binary xdb file path\n");
@@ -73,32 +76,30 @@ public class SearchTest {
return;
}
- Searcher searcher = createSearcher(dbPath, cachePolicy);
- final BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
- System.out.printf("ip2region xdb searcher test program, cachePolicy: %s\ntype 'quit' to exit\n", cachePolicy);
- while ( true ) {
- System.out.print("ip2region>> ");
- String line = reader.readLine().trim();
- if ( line.length() < 2 ) {
- continue;
- }
+ try (Searcher searcher = createSearcher(dbPath, cachePolicy);
+ BufferedReader reader = new BufferedReader(new InputStreamReader(System.in))) {
+ System.out.printf("ip2region xdb searcher test program, cachePolicy: %s\ntype 'quit' to exit\n", cachePolicy);
+ while (true) {
+ System.out.print("ip2region>> ");
+ String line = reader.readLine().trim();
+ if (line.length() < 2) {
+ continue;
+ }
- if ( line.equalsIgnoreCase("quit") ) {
- break;
- }
+ if ("quit".equalsIgnoreCase(line)) {
+ break;
+ }
- try {
- double sTime = System.nanoTime();
- String region = searcher.search(line);
- long cost = TimeUnit.NANOSECONDS.toMicros((long) (System.nanoTime() - sTime));
- System.out.printf("{region: %s, ioCount: %d, took: %d μs}\n", region, searcher.getIOCount(), cost);
- } catch (Exception e) {
- System.out.printf("{err: %s, ioCount: %d}\n", e, searcher.getIOCount());
+ try {
+ double sTime = System.nanoTime();
+ String region = searcher.search(line);
+ long cost = TimeUnit.NANOSECONDS.toMicros((long) (System.nanoTime() - sTime));
+ System.out.printf("{region: %s, ioCount: %d, took: %d μs}\n", region, searcher.getIOCount(), cost);
+ } catch (Exception e) {
+ System.out.printf("{err: %s, ioCount: %d}\n", e, searcher.getIOCount());
+ }
}
}
-
- reader.close();
- searcher.close();
System.out.println("searcher test program exited, thanks for trying");
}
@@ -121,19 +122,23 @@ public class SearchTest {
String key = r.substring(2, sIdx);
String val = r.substring(sIdx + 1);
- if ("db".equals(key)) {
- dbPath = val;
- } else if ("src".equals(key)) {
- srcPath = val;
- } else if ("cache-policy".equals(key)) {
- cachePolicy = val;
- } else {
- System.out.printf("undefined option `%s`\n", r);
- return;
+ switch (key) {
+ case "db":
+ dbPath = val;
+ break;
+ case "src":
+ srcPath = val;
+ break;
+ case "cache-policy":
+ cachePolicy = val;
+ break;
+ default:
+ System.out.printf("undefined option `%s`\n", r);
+ return;
}
}
- if (dbPath.length() < 1 || srcPath.length() < 1) {
+ if (dbPath.isEmpty() || srcPath.isEmpty()) {
System.out.print("java -jar ip2region-{version}.jar bench [command options]\n");
System.out.print("options:\n");
System.out.print(" --db string ip2region binary xdb file path\n");
@@ -142,61 +147,59 @@ public class SearchTest {
return;
}
- Searcher searcher = createSearcher(dbPath, cachePolicy);
long count = 0, costs = 0, tStart = System.nanoTime();
- String line;
- final BufferedReader reader = new BufferedReader(new FileReader(srcPath));
- while ((line = reader.readLine()) != null) {
- String l = line.trim();
- String[] ps = l.split("\\|", 3);
- if (ps.length != 3) {
- System.out.printf("invalid ip segment `%s`\n", l);
- return;
- }
-
- long sip;
- try {
- sip = Searcher.checkIP(ps[0]);
- } catch (Exception e) {
- System.out.printf("check start ip `%s`: %s\n", ps[0], e);
- return;
- }
-
- long eip;
- try {
- eip = Searcher.checkIP(ps[1]);
- } catch (Exception e) {
- System.out.printf("check end ip `%s`: %s\n", ps[1], e);
- return;
- }
-
- if (sip > eip) {
- System.out.printf("start ip(%s) should not be greater than end ip(%s)\n", ps[0], ps[1]);
- return;
- }
-
- long mip = (sip + eip) >> 1;
- for (final long ip : new long[]{sip, (sip + mip) >> 1, mip, (mip + eip) >> 1, eip}) {
- long sTime = System.nanoTime();
- String region = searcher.search(ip);
- costs += System.nanoTime() - sTime;
-
- // check the region info
- if (!ps[2].equals(region)) {
- System.out.printf("failed search(%s) with (%s != %s)\n", Searcher.long2ip(ip), region, ps[2]);
+ try (Searcher searcher = createSearcher(dbPath, cachePolicy);
+ BufferedReader reader = new BufferedReader(new FileReader(srcPath))) {
+ String line;
+ while ((line = reader.readLine()) != null) {
+ String l = line.trim();
+ String[] ps = l.split("\\|", 3);
+ if (ps.length != 3) {
+ System.out.printf("invalid ip segment `%s`\n", l);
return;
}
- count++;
+ long sip;
+ try {
+ sip = Searcher.checkIP(ps[0]);
+ } catch (Exception e) {
+ System.out.printf("check start ip `%s`: %s\n", ps[0], e);
+ return;
+ }
+
+ long eip;
+ try {
+ eip = Searcher.checkIP(ps[1]);
+ } catch (Exception e) {
+ System.out.printf("check end ip `%s`: %s\n", ps[1], e);
+ return;
+ }
+
+ if (sip > eip) {
+ System.out.printf("start ip(%s) should not be greater than end ip(%s)\n", ps[0], ps[1]);
+ return;
+ }
+
+ long mip = (sip + eip) >> 1;
+ for (final long ip : new long[]{sip, (sip + mip) >> 1, mip, (mip + eip) >> 1, eip}) {
+ long sTime = System.nanoTime();
+ String region = searcher.search(ip);
+ costs += System.nanoTime() - sTime;
+
+ // check the region info
+ if (!ps[2].equals(region)) {
+ System.out.printf("failed search(%s) with (%s != %s)\n", Searcher.long2ip(ip), region, ps[2]);
+ return;
+ }
+
+ count++;
+ }
}
}
-
- reader.close();
- searcher.close();
long took = System.nanoTime() - tStart;
System.out.printf("Bench finished, {cachePolicy: %s, total: %d, took: %ds, cost: %d μs/op}\n",
cachePolicy, count, TimeUnit.NANOSECONDS.toSeconds(took),
- count == 0 ? 0 : TimeUnit.NANOSECONDS.toMicros(costs/count));
+ count == 0 ? 0 : TimeUnit.NANOSECONDS.toMicros(costs / count));
}
public static void main(String[] args) {
diff --git a/binding/java/src/main/java/org/lionsoul/ip2region/UtilTest.java b/binding/java/src/main/java/org/lionsoul/ip2region/UtilTest.java
index aba7779..06e806c 100644
--- a/binding/java/src/main/java/org/lionsoul/ip2region/UtilTest.java
+++ b/binding/java/src/main/java/org/lionsoul/ip2region/UtilTest.java
@@ -12,7 +12,7 @@ public class UtilTest {
public static void testIP2Long() {
String ip = "1.2.3.4";
- long ipAddr = 0;
+ long ipAddr;
try {
ipAddr = Searcher.checkIP(ip);
} catch (Exception e) {
diff --git a/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Header.java b/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Header.java
index a55cedc..b38f918 100644
--- a/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Header.java
+++ b/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Header.java
@@ -24,13 +24,14 @@ public class Header {
buffer = buff;
}
- @Override public String toString() {
+ @Override
+ public String toString() {
return "{" +
- "Version: " + version + ',' +
- "IndexPolicy: " + indexPolicy + ',' +
- "CreatedAt: " + createdAt + ',' +
- "StartIndexPtr: " + startIndexPtr + ',' +
- "EndIndexPtr: " + endIndexPtr +
- '}';
+ "Version: " + version + ',' +
+ "IndexPolicy: " + indexPolicy + ',' +
+ "CreatedAt: " + createdAt + ',' +
+ "StartIndexPtr: " + startIndexPtr + ',' +
+ "EndIndexPtr: " + endIndexPtr +
+ '}';
}
}
diff --git a/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Searcher.java b/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Searcher.java
index f441036..67e111e 100644
--- a/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Searcher.java
+++ b/binding/java/src/main/java/org/lionsoul/ip2region/xdb/Searcher.java
@@ -9,22 +9,21 @@ package org.lionsoul.ip2region.xdb;
// @Date 2022/06/23
+import java.io.Closeable;
import java.io.IOException;
import java.io.RandomAccessFile;
+import java.nio.charset.StandardCharsets;
-public class Searcher {
+public class Searcher implements Closeable {
// constant defined copied from the xdb maker
public static final int HeaderInfoLength = 256;
- public static final int VectorIndexRows = 256;
- public static final int VectorIndexCols = 256;
- public static final int VectorIndexSize = 8;
+ public static final int VectorIndexRows = 256;
+ public static final int VectorIndexCols = 256;
+ public static final int VectorIndexSize = 8;
public static final int SegmentIndexSize = 14;
-
+ public static final byte[] shiftIndex = {24, 16, 8, 0};
// random access file handle for file based search
private final RandomAccessFile handle;
-
- private int ioCount = 0;
-
// vector index.
// use the byte[] instead of VectorIndex entry array to keep
// the minimal memory allocation.
@@ -34,20 +33,7 @@ public class Searcher {
private final byte[] contentBuff;
// --- static method to create searchers
-
- public static Searcher newWithFileOnly(String dbPath) throws IOException {
- return new Searcher(dbPath, null, null);
- }
-
- public static Searcher newWithVectorIndex(String dbPath, byte[] vectorIndex) throws IOException {
- return new Searcher(dbPath, vectorIndex, null);
- }
-
- public static Searcher newWithBuffer(byte[] cBuff) throws IOException {
- return new Searcher(null, null, cBuff);
- }
-
- // --- End of creator
+ private int ioCount = 0;
public Searcher(String dbFile, byte[] vectorIndex, byte[] cBuff) throws IOException {
if (cBuff != null) {
@@ -61,6 +47,130 @@ public class Searcher {
}
}
+ public static Searcher newWithFileOnly(String dbPath) throws IOException {
+ return new Searcher(dbPath, null, null);
+ }
+
+ // --- End of creator
+
+ public static Searcher newWithVectorIndex(String dbPath, byte[] vectorIndex) throws IOException {
+ return new Searcher(dbPath, vectorIndex, null);
+ }
+
+ public static Searcher newWithBuffer(byte[] cBuff) throws IOException {
+ return new Searcher(null, null, cBuff);
+ }
+
+ public static Header loadHeader(RandomAccessFile handle) throws IOException {
+ handle.seek(0);
+ final byte[] buff = new byte[HeaderInfoLength];
+ handle.read(buff);
+ return new Header(buff);
+ }
+
+ public static Header loadHeaderFromFile(String dbPath) throws IOException {
+ final RandomAccessFile handle = new RandomAccessFile(dbPath, "r");
+ final Header header = loadHeader(handle);
+ handle.close();
+ return header;
+ }
+
+ public static byte[] loadVectorIndex(RandomAccessFile handle) throws IOException {
+ handle.seek(HeaderInfoLength);
+ int len = VectorIndexRows * VectorIndexCols * VectorIndexSize;
+ final byte[] buff = new byte[len];
+ int rLen = handle.read(buff);
+ if (rLen != len) {
+ throw new IOException("incomplete read: read bytes should be " + len);
+ }
+
+ return buff;
+ }
+
+ public static byte[] loadVectorIndexFromFile(String dbPath) throws IOException {
+ final RandomAccessFile handle = new RandomAccessFile(dbPath, "r");
+ final byte[] vIndex = loadVectorIndex(handle);
+ handle.close();
+ return vIndex;
+ }
+
+ // --- static cache util function
+
+ public static byte[] loadContent(RandomAccessFile handle) throws IOException {
+ handle.seek(0);
+ final byte[] buff = new byte[(int) handle.length()];
+ int rLen = handle.read(buff);
+ if (rLen != buff.length) {
+ throw new IOException("incomplete read: read bytes should be " + buff.length);
+ }
+
+ return buff;
+ }
+
+ public static byte[] loadContentFromFile(String dbPath) throws IOException {
+ final RandomAccessFile handle = new RandomAccessFile(dbPath, "r");
+ final byte[] content = loadContent(handle);
+ handle.close();
+ return content;
+ }
+
+ /* get an int from a byte array start from the specified offset */
+ public static long getIntLong(byte[] b, int offset) {
+ return (
+ ((b[offset++] & 0x000000FFL)) |
+ ((b[offset++] << 8) & 0x0000FF00L) |
+ ((b[offset++] << 16) & 0x00FF0000L) |
+ ((b[offset] << 24) & 0xFF000000L)
+ );
+ }
+
+ public static int getInt(byte[] b, int offset) {
+ return (
+ ((b[offset++] & 0x000000FF)) |
+ ((b[offset++] << 8) & 0x0000FF00) |
+ ((b[offset++] << 16) & 0x00FF0000) |
+ ((b[offset] << 24) & 0xFF000000)
+ );
+ }
+
+ public static int getInt2(byte[] b, int offset) {
+ return (
+ ((b[offset++] & 0x000000FF)) |
+ ((b[offset] << 8) & 0x0000FF00)
+ );
+ }
+
+ /* long int to ip string */
+ public static String long2ip(long ip) {
+ return String.valueOf((ip >> 24) & 0xFF) + '.' +
+ ((ip >> 16) & 0xFF) + '.' + ((ip >> 8) & 0xFF) + '.' + ((ip) & 0xFF);
+ }
+
+ // --- End cache load util function
+
+ // --- static util method
+
+ /* check the specified ip address */
+ public static long checkIP(String ip) throws Exception {
+ String[] ps = ip.split("\\.");
+ if (ps.length != 4) {
+ throw new Exception("invalid ip address `" + ip + "`");
+ }
+
+ long ipDst = 0;
+ for (int i = 0; i < ps.length; i++) {
+ int val = Integer.parseInt(ps[i]);
+ if (val > 255) {
+ throw new Exception("ip part `" + ps[i] + "` should be less then 256");
+ }
+
+ ipDst |= ((long) val << shiftIndex[i]);
+ }
+
+ return ipDst & 0xFFFFFFFFL;
+ }
+
+ @Override
public void close() throws IOException {
if (this.handle != null) {
this.handle.close();
@@ -135,7 +245,7 @@ public class Searcher {
// load and return the region data
final byte[] regionBuff = new byte[dataLen];
read(dataPtr, regionBuff);
- return new String(regionBuff, "utf-8");
+ return new String(regionBuff, StandardCharsets.UTF_8);
}
protected void read(int offset, byte[] buffer) throws IOException {
@@ -157,116 +267,4 @@ public class Searcher {
}
}
- // --- static cache util function
-
- public static Header loadHeader(RandomAccessFile handle) throws IOException {
- handle.seek(0);
- final byte[] buff = new byte[HeaderInfoLength];
- handle.read(buff);
- return new Header(buff);
- }
-
- public static Header loadHeaderFromFile(String dbPath) throws IOException {
- final RandomAccessFile handle = new RandomAccessFile(dbPath, "r");
- final Header header = loadHeader(handle);
- handle.close();
- return header;
- }
-
- public static byte[] loadVectorIndex(RandomAccessFile handle) throws IOException {
- handle.seek(HeaderInfoLength);
- int len = VectorIndexRows * VectorIndexCols * VectorIndexSize;
- final byte[] buff = new byte[len];
- int rLen = handle.read(buff);
- if (rLen != len) {
- throw new IOException("incomplete read: read bytes should be " + len);
- }
-
- return buff;
- }
-
- public static byte[] loadVectorIndexFromFile(String dbPath) throws IOException {
- final RandomAccessFile handle = new RandomAccessFile(dbPath, "r");
- final byte[] vIndex = loadVectorIndex(handle);
- handle.close();
- return vIndex;
- }
-
- public static byte[] loadContent(RandomAccessFile handle) throws IOException {
- handle.seek(0);
- final byte[] buff = new byte[(int) handle.length()];
- int rLen = handle.read(buff);
- if (rLen != buff.length) {
- throw new IOException("incomplete read: read bytes should be " + buff.length);
- }
-
- return buff;
- }
-
- public static byte[] loadContentFromFile(String dbPath) throws IOException {
- final RandomAccessFile handle = new RandomAccessFile(dbPath, "r");
- final byte[] content = loadContent(handle);
- handle.close();
- return content;
- }
-
- // --- End cache load util function
-
- // --- static util method
-
- /* get an int from a byte array start from the specified offset */
- public static long getIntLong(byte[] b, int offset) {
- return (
- ((b[offset++] & 0x000000FFL)) |
- ((b[offset++] << 8) & 0x0000FF00L) |
- ((b[offset++] << 16) & 0x00FF0000L) |
- ((b[offset ] << 24) & 0xFF000000L)
- );
- }
-
- public static int getInt(byte[] b, int offset) {
- return (
- ((b[offset++] & 0x000000FF)) |
- ((b[offset++] << 8) & 0x0000FF00) |
- ((b[offset++] << 16) & 0x00FF0000) |
- ((b[offset ] << 24) & 0xFF000000)
- );
- }
-
- public static int getInt2(byte[] b, int offset) {
- return (
- ((b[offset++] & 0x000000FF)) |
- ((b[offset ] << 8) & 0x0000FF00)
- );
- }
-
- /* long int to ip string */
- public static String long2ip( long ip )
- {
- return String.valueOf((ip >> 24) & 0xFF) + '.' +
- ((ip >> 16) & 0xFF) + '.' + ((ip >> 8) & 0xFF) + '.' + ((ip) & 0xFF);
- }
-
- public static final byte[] shiftIndex = {24, 16, 8, 0};
-
- /* check the specified ip address */
- public static long checkIP(String ip) throws Exception {
- String[] ps = ip.split("\\.");
- if (ps.length != 4) {
- throw new Exception("invalid ip address `" + ip + "`");
- }
-
- long ipDst = 0;
- for (int i = 0; i < ps.length; i++) {
- int val = Integer.parseInt(ps[i]);
- if (val > 255) {
- throw new Exception("ip part `"+ps[i]+"` should be less then 256");
- }
-
- ipDst |= ((long) val << shiftIndex[i]);
- }
-
- return ipDst & 0xFFFFFFFFL;
- }
-
-}
\ No newline at end of file
+}