(转)判断一个IP地址是否为内网IP（备忘）

java 代码/*判断是否是内网IP*/public static boolean isInnerIP(String ipAddress){
boolean isInnerIp = false;
long ipNum = getIpNum(ipAddress);
/**
私有IP：A类 10.0.0.0-10.255.255.255
B类 172.16.0.0-172.31.255.255
C类 192.168.0.0-192.168.255.255
当然，还有127这个网段是环回地址
**/
long aBegin = getIpNum("10.0.0.0");
long aEnd = getIpNum("10.255.255.255");
long bBegin = getIpNum("172.16.0.0");
long bEnd = getIpNum("172.31.255.255");
long cBegin = getIpNum("192.168.0.0");
long cEnd = getIpNum("192.168.255.255");
isInnerIp = isInner(ipNum,aBegin,aEnd) || isInner(ipNum,bBegin,bEnd) || isInner(ipNum,cBegin,cEnd) || ipAddress.equals("127.0.0.1");
return isInnerIp;
}

java 代码/*获取IP数*/
private static long getIpNum(String ipAddress) {
String [] ip = ipAddress.split("//.");
long a = Integer.parseInt(ip[0]);
long b = Integer.parseInt(ip[1]);
long c = Integer.parseInt(ip[2]);
long d = Integer.parseInt(ip[3]);

long ipNum = a * 256 * 256 * 256 + b * 256 * 256 + c * 256 + d;
return ipNum;
}

java 代码
private static boolean isInner(long userIp,long begin,long end){
return (userIp>=begin) && (userIp<=end);
}