java处理ip的工具类，包括把long类型的Ip转为一般Ip类型、把xx.xx.xx.xx类型的转为long类型、根据掩码位获取掩码、根据 ip/掩码位 计算IP段的起始IP、根据 ip/掩码位 计算IP段的终止IP等方法，可以直接使用！
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*
*/
public class IPUtils
{
/**
* 把long类型的Ip转为一般Ip类型：xx.xx.xx.xx
*
* @param ip
* @return
*/
public static String getIpFromLong(Long ip)
{
String s1 = String.valueOf((ip & 4278190080L) / 16777216L);
String s2 = String.valueOf((ip & 16711680L) / 65536L);
String s3 = String.valueOf((ip & 65280L) / 256L);
String s4 = String.valueOf(ip & 255L);
return s1 + "." + s2 + "." + s3 + "." + s4;
}
/**
* 把xx.xx.xx.xx类型的转为long类型的
*
* @param ip
* @return
*/
public static Long getIpFromString(String ip)
{
Long ipLong = 0L;
String ipTemp = ip;
ipLong = ipLong * 256
+ Long.parseLong(ipTemp.substring(0, ipTemp.indexOf(".")));
ipTemp = ipTemp.substring(ipTemp.indexOf(".") + 1, ipTemp.length());
ipLong = ipLong * 256
+ Long.parseLong(ipTemp.substring(0, ipTemp.indexOf(".")));
ipTemp = ipTemp.substring(ipTemp.indexOf(".") + 1, ipTemp.length());
ipLong = ipLong * 256
+ Long.parseLong(ipTemp.substring(0, ipTemp.indexOf(".")));
ipTemp = ipTemp.substring(ipTemp.indexOf(".") + 1, ipTemp.length());
ipLong = ipLong * 256 + Long.parseLong(ipTemp);
return ipLong;
}
/**
* 根据掩码位获取掩码
*
* @param maskBit
* 掩码位数，如"28"、"30"
* @return
*/
public static String getMaskByMaskBit(String maskBit)
{
return StringUtils.isEmpty(maskBit) ? "error, maskBit is null !"
: maskBitMap().get(maskBit);
}
/**
* 根据 ip/掩码位 计算IP段的起始IP 如 IP串 218.240.38.69/30
*
* @param ip
* 给定的IP，如218.240.38.69
* @param maskBit
* 给定的掩码位，如30
* @return 起始IP的字符串表示
*/
public static String getBeginIpStr(String ip, String maskBit)
{
return getIpFromLong(getBeginIpLong(ip, maskBit));
}
/**
* 根据 ip/掩码位 计算IP段的起始IP 如 IP串 218.240.38.69/30
*
* @param ip
* 给定的IP，如218.240.38.69
* @param maskBit
* 给定的掩码位，如30
* @return 起始IP的长整型表示
*/
public static Long getBeginIpLong(String ip, String maskBit)
{
return getIpFromString(ip) & getIpFromString(getMaskByMaskBit(maskBit));
}
/**
* 根据 ip/掩码位 计算IP段的终止IP 如 IP串 218.240.38.69/30
*
* @param ip
* 给定的IP，如218.240.38.69
* @param maskBit
* 给定的掩码位，如30
* @return 终止IP的字符串表示
*/
public static String getEndIpStr(String ip, String maskBit)
{
return getIpFromLong(getEndIpLong(ip, maskBit));
}
/**
* 根据 ip/掩码位 计算IP段的终止IP 如 IP串 218.240.38.69/30
*
* @param ip
* 给定的IP，如218.240.38.69
* @param maskBit
* 给定的掩码位，如30
* @return 终止IP的长整型表示
*/
public static Long getEndIpLong(String ip, String maskBit)
{
return getBeginIpLong(ip, maskBit)
+ ~getIpFromString(getMaskByMaskBit(maskBit));
}
/**
* 根据子网掩码转换为掩码位 如 255.255.255.252转换为掩码位 为 30
*
* @param netmarks
* @return
*/
public static int getNetMask(String netmarks)
{
StringBuffer sbf;
String str;
int inetmask = 0, count = 0;
String[] ipList = netmarks.split("\\.");
for (int n = 0; n < ipList.length; n++)
{
sbf = toBin(Integer.parseInt(ipList[n]));
str = sbf.reverse().toString();
count = 0;
for (int i = 0; i < str.length(); i++)
{
i = str.indexOf('1', i);
if (i == -1)
{
break;
}
count++;
}
inetmask += count;
}
return inetmask;
}
/**
* 计算子网大小
*
* @param netmask
* 掩码位
* @return
*/
public static int getPoolMax(int maskBit)
{
if (maskBit <= 0 || maskBit >= 32)
{
return 0;
}
return (int) Math.pow(2, 32 - maskBit) - 2;
}
private static StringBuffer toBin(int x)
{
StringBuffer result = new StringBuffer();
result.append(x % 2);
x /= 2;
while (x > 0)
{
result.append(x % 2);
x /= 2;
}
return result;
}
/*
* 存储着所有的掩码位及对应的掩码 key:掩码位 value:掩码（x.x.x.x）
*/
private static Map<String, String> maskBitMap()
{
Map<String, String> maskBit = new HashMap<String, String>();
maskBit.put("1", "128.0.0.0");
maskBit.put("2", "192.0.0.0");
maskBit.put("3", "224.0.0.0");
maskBit.put("4", "240.0.0.0");
maskBit.put("5", "248.0.0.0");
maskBit.put("6", "252.0.0.0");
maskBit.put("7", "254.0.0.0");
maskBit.put("8", "255.0.0.0");
maskBit.put("9", "255.128.0.0");
maskBit.put("10", "255.192.0.0");
maskBit.put("11", "255.224.0.0");
maskBit.put("12", "255.240.0.0");
maskBit.put("13", "255.248.0.0");
maskBit.put("14", "255.252.0.0");
maskBit.put("15", "255.254.0.0");
maskBit.put("16", "255.255.0.0");
maskBit.put("17", "255.255.128.0");
maskBit.put("18", "255.255.192.0");
maskBit.put("19", "255.255.224.0");
maskBit.put("20", "255.255.240.0");
maskBit.put("21", "255.255.248.0");
maskBit.put("22", "255.255.252.0");
maskBit.put("23", "255.255.254.0");
maskBit.put("24", "255.255.255.0");
maskBit.put("25", "255.255.255.128");
maskBit.put("26", "255.255.255.192");
maskBit.put("27", "255.255.255.224");
maskBit.put("28", "255.255.255.240");
maskBit.put("29", "255.255.255.248");
maskBit.put("30", "255.255.255.252");
maskBit.put("31", "255.255.255.254");
maskBit.put("32", "255.255.255.255");
return maskBit;
}
/**
* 根据掩码位获取掩码
*
* @param masks
* @return
*/
@Deprecated
public static String getMaskByMaskBit(int masks)
{
String ret = "";
if (masks == 1)
ret = "128.0.0.0";
else if (masks == 2)
ret = "192.0.0.0";
else if (masks == 3)
ret = "224.0.0.0";
else if (masks == 4)
ret = "240.0.0.0";
else if (masks == 5)
ret = "248.0.0.0";
else if (masks == 6)
ret = "252.0.0.0";
else if (masks == 7)
ret = "254.0.0.0";
else if (masks == 8)
ret = "255.0.0.0";
else if (masks == 9)
ret = "255.128.0.0";
else if (masks == 10)
ret = "255.192.0.0";
else if (masks == 11)
ret = "255.224.0.0";
else if (masks == 12)
ret = "255.240.0.0";
else if (masks == 13)
ret = "255.248.0.0";
else if (masks == 14)
ret = "255.252.0.0";
else if (masks == 15)
ret = "255.254.0.0";
else if (masks == 16)
ret = "255.255.0.0";
else if (masks == 17)
ret = "255.255.128.0";
else if (masks == 18)
ret = "255.255.192.0";
else if (masks == 19)
ret = "255.255.224.0";
else if (masks == 20)
ret = "255.255.240.0";
else if (masks == 21)
ret = "255.255.248.0";
else if (masks == 22)
ret = "255.255.252.0";
else if (masks == 23)
ret = "255.255.254.0";
else if (masks == 24)
ret = "255.255.255.0";
else if (masks == 25)
ret = "255.255.255.128";
else if (masks == 26)
ret = "255.255.255.192";
else if (masks == 27)
ret = "255.255.255.224";
else if (masks == 28)
ret = "255.255.255.240";
else if (masks == 29)
ret = "255.255.255.248";
else if (masks == 30)
ret = "255.255.255.252";
else if (masks == 31)
ret = "255.255.255.254";
else if (masks == 32)
ret = "255.255.255.255";
return ret;
}
}
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