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| public static long ipToLong(String ipString) throws NumberFormatException {
long result = 0;
String[] terms = ipString.split("\\.");
if (terms.length != 4) {
return -1;
}
result += Long.parseLong(terms[0]) << 24;
result += Long.parseLong(terms[1]) << 16;
result += Long.parseLong(terms[2]) << 8;
result += Long.parseLong(terms[3]);
return result;
}
public static String longToIp(long ipLong) {
return (ipLong >>> 24) + "." +
((ipLong >>> 16) & 0xFF) + "." +
((ipLong >>> 8) & 0xFF) + "." +
(ipLong & 0xFF);
}
public static void main(String[] args) {
long result = ipToLong("255.255.255.255");
System.out.println(result);
System.out.println(longToIp(result));
}
|