package org.springside.modules.utils.net;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.List;
import org.springside.modules.utils.number.NumberUtil;
import org.springside.modules.utils.text.MoreStringUtil;
import com.google.common.net.InetAddresses;
/**
* InetAddress工具类,基于Guava的InetAddresses.
*
* 主要包含int, String/IPV4String, InetAdress/Inet4Address之间的互相转换
*
* 先将字符串传换为byte[]再用InetAddress.getByAddress(byte[]),避免了InetAddress.getByName(ip)可能引起的DNS访问.
*
* InetAddress与String的转换其实消耗不小,如果是有限的地址,建议进行缓存.
*
* @author calvin
*/
public class IPUtil {
/**
* 从InetAddress转化到int, 传输和存储时, 用int代表InetAddress是最小的开销.
*
* InetAddress可以是IPV4或IPV6,都会转成IPV4.
*
* @see com.google.common.net.InetAddresses#coerceToInteger(InetAddress)
*/
public static int toInt(InetAddress address) {
return InetAddresses.coerceToInteger(address);
}
/**
* InetAddress转换为String.
*
* InetAddress可以是IPV4或IPV6. 其中IPV4直接调用getHostAddress()
*
* @see com.google.common.net.InetAddresses#toAddrString(InetAddress)
*/
public static String toString(InetAddress address) {
return InetAddresses.toAddrString(address);
}
/**
* 从int转换为Inet4Address(仅支持IPV4)
*/
public static Inet4Address fromInt(int address) {
return InetAddresses.fromInteger(address);
}
/**
* 从String转换为InetAddress.
*
* IpString可以是ipv4 或 ipv6 string, 但不可以是域名.
*
* 先字符串传换为byte[]再调getByAddress(byte[]),避免了调用getByName(ip)可能引起的DNS访问.
*/
public static InetAddress fromIpString(String address) {
return InetAddresses.forString(address);
}
/**
* 从IPv4String转换为InetAddress.
*
* IpString如果确定ipv4, 使用本方法减少字符分析消耗 .
*
* 先字符串传换为byte[]再调getByAddress(byte[]),避免了调用getByName(ip)可能引起的DNS访问.
*/
public static Inet4Address fromIpv4String(String address) {
byte[] bytes = ip4StringToBytes(address);
if (bytes == null) {
return null;
} else {
try {
return (Inet4Address) Inet4Address.getByAddress(bytes);
} catch (UnknownHostException e) {
throw new AssertionError(e);
}
}
}
/**
* int转换到IPV4 String, from Netty NetUtil
*/
public static String intToIpv4String(int i) {
return new StringBuilder(15).append(i >> 24 & 0xff).append('.').append(i >> 16 & 0xff).append('.')
.append(i >> 8 & 0xff).append('.').append(i & 0xff).toString();
}
/**
* Ipv4 String 转换到int
*/
public static int ipv4StringToInt(String ipv4Str) {
byte[] byteAddress = ip4StringToBytes(ipv4Str);
if (byteAddress == null) {
return 0;
} else {
return NumberUtil.toInt(byteAddress);
}
}
/**
* Ipv4 String 转换到byte[]
*/
private static byte[] ip4StringToBytes(String ipv4Str) {
if (ipv4Str == null) {
return null;
}
List<String> it = MoreStringUtil.split(ipv4Str, '.', 4);
if (it.size() != 4) {
return null;
}
byte[] byteAddress = new byte[4];
for (int i = 0; i < 4; i++) {
int tempInt = Integer.parseInt(it.get(i));
if (tempInt > 255) {
return null;
}
byteAddress[i] = (byte) tempInt;
}
return byteAddress;
}
}