Java convert Base64 to Hex String [duplicate]

Answer 1

Hey try this code it gives the expected output

import java.util.Base64;

/**
*
* @author hemants
*/
public class NewClass5 {

    public static void main(String[] args) {
        String guid = "YxRfXk827kPgkmMUX15PNg==";
        byte[] decoded = Base64.getDecoder().decode(guid);
        System.out.println(toHex(decoded));
    }
    private static final char[] DIGITS
            = {'0', '1', '2', '3', '4', '5', '6', '7',
                '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};

    public static final String toHex(byte[] data) {
        final StringBuffer sb = new StringBuffer(data.length * 2);
        for (int i = 0; i < data.length; i++) {
            sb.append(DIGITS[(data[i] >>> 4) & 0x0F]);
            sb.append(DIGITS[data[i] & 0x0F]);
        }
        return sb.toString();
    }

}

Output

63145F5E4F36EE43E09263145F5E4F36

Answer 2

Since you are already using Apache Common Codec:

String guid = "YxRfXk827kPgkmMUX15PNg==";
byte[] decoded = Base64.decodeBase64(guid);
String hexString = Hex.encodeHexString(decoded);
System.out.println(hexString);

Using standard Java libraries:

String guid = "YxRfXk827kPgkmMUX15PNg==";
byte[] decoded = Base64.getDecoder().decode(guid);
System.out.println(String.format("%040x", new BigInteger(1, decoded)));