how to get a byte[] representation from a IP in String form in Java

Question

Suppose I have the IP stored in a String:

String ip = "192.168.2.1"

and I want to get the byte array with the four ints. How can I do it? Thanks!

Answer 1

Each number is a byte, so in your case the appropriate byte[] would be { 192, 168, 2, 1 }.

To be more specific, if you have the string, you first have to split it by the "."s and then parse a byte from each resulting string.

Answer 2

Something like this:

InetAddress ip = InetAddress.getByName("192.168.2.1");
byte[] bytes = ip.getAddress();
for (byte b : bytes) {
    System.out.println(b & 0xFF);
}

Answer 3

Something like

String ip = "127.0.0.1";
String numbers= "\\.";//the dot char                
String[] result = null;
result = ip.split(numbers);

according to this should works.