java - Hex-encoded String to Byte Array

Question

String str = "9B7D2C34A366BF890C730641E6CECF6F";

I want to convert str into byte array, but str.getBytes() returns 32 bytes instead of 16.

Answer 1

I think what the questioner is after is converting the string representation of a hexadecimal value to a byte array representing that hexadecimal value.

The apache commons-codec has a class for that, Hex.

String s = "9B7D2C34A366BF890C730641E6CECF6F";    
byte[] bytes = Hex.decodeHex(s.toCharArray());